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Relationship Between Physical Activity Levels and Psychological Well-Being Among Male University Students in South East, Nigeria: A Cross-Sectional Study

This study aimed to evaluate the associations between physical activity (PA) and psychological well-being (PWB) among male university students. An institutionally based cross-sectional study was completed by 243 young men aged 18–30 years in a Nigerian public university. PA was measured using the International Physical Activity Questionnaire-Short Form (IPAQ-SF), and PWB was measured by Ryff’s Scale of Psychological Well-being (PWB). The mean age of the participants was 24.9 (SD = 7.61) and majority (39.1%) of the participants was aged 18–22 years. Regarding PA, 16.0%, 64.2%, and 19.8% of the participants had low, moderate, and high PA levels, respectively. The mean total PWB score was 119.9 (SD = 23.64). For the domains of PWB, male students had mean scores of 25.73 (SD = 6.05), 19.42 (SD = 6.82), 25.75 (6.10), 14.12 (SD = 3.89), 13.70 (SD = 4.04) and 21.12 (4.92) for self-acceptance, autonomy, positive relations, environmental mastery, purpose in life and personal growth, respectively. Total PA (total MET min/week) was associated with the total PWB scores (β = 0.13, p < .05). The total PA METs was significantly associated with self-acceptance (β = 0.13, p < .05). positive relations (β = 0.16, p < .05), purpose in life (β = 0.39, p < .05). Vigorous PA METs showed significantly negative effect on personal growth (β = −0.28, p < .05) and accounted for 2.0% of the variance of personal growth. PA accounted for 2.5% and 1.2% of the variance of positive relations and purpose in life, respectively., Most of the young men had moderate levels of PA and PWB. PA was significantly associated with PWB among the young men. Male sensitive evidence-based health promotion interventions should aim at promoting PA and PWB among male university students.

reported that 31.1% of adults aged 15 years or older are physically inactive worldwide. The decline in PA levels among young adults could be a potential risk factor for the onset of chronic diseases (Bonevski et al., 2013), mental health problems such as depression and anxiety (McMahon et al., 2017), and poor cognitive functioning (Sallis & Owen, 1999).
Young people's transition from secondary school into the university environment in Nigeria is characterized by many challenges such as academic demands and stress, financial difficulties, and other school environmentrelated factors (Fawzy & Hamed, 2017;Hiester et al., 2009). These challenges pose significant risks to the physical and mental health of university students. Prior studies have reported that university students are vulnerable to mental health problems (Ibrahim et al., 2013;Nunes et al., 2014). Although the university environment provides opportunities for the development of healthy lifestyles and formation of healthy behaviors (Niedermeier et al., 2018), improvement in mental and cognitive functioning among young adults (Sallis & Owen, 1999); it also creates chances for young adults' physical inactivity and sedentary lifestyles (Hallal et al., 2012) and mental health problems (Fawzy & Hamed, 2017). Studies from developed countries have reported that mental health problems among young adults have increased over the past decade (Biddle et al., 2018;Reneflot et al., 2018).
In Nigeria, the overall PA levels of young adults appear to be declining (Adeniyi et al., 2016). For instance, only 37% of young adults engaged in 60 min of MVPA daily (Oyeyemi et al., 2017), 59% engaged at moderate levels (Odunaiya et al., 2010), 3.8% engaged in low levels of PA (Adeniyi et al., 2011), and approximately 72% engaged in PA at least once a month (Senbanjo & Oshikoya, 2010). Atilola et al. (2015) reported that the mental health concerns of young people remain neglected, misunderstood, and under-researched in Nigeria. A study (Ifeagwazi et al., 2015) reported that Nigerian undergraduate students have poor psychological well-being (PWB) due to personal, political, and socioeconomic alienation. Mental disorders have an immense individual and societal financial burden in Nigeria (Esan et al., 2012). The authors further found that mental disorders seem to be more severe in males.
Research evidence suggests that young men are underrepresented in interventions aimed at improving physical and mental health outcomes. Pagoto et al. (2012) reported that interventions aimed at improving healthy behaviors are predominantly focused on middle-aged and female participants. Research evidence suggests the need for interventions to be sensitive to both gender and age (Oliffe & Greaves 2012). Ashton et al. (2015) conducted a systematic review of health-related interventions exclusively in young males. They found that none of the interventions included in the review were explicitly designed for young men. The designers of the interventions recruited young men to ensure a similar sample or for expediency (Ashton et al., 2015). The underrepresentation or limited involvement of young men in healthrelated interventions could be due to a dearth of information on different facets of their health and general well-being. Thus, an investigation of the PA level of male university undergraduates, and positive mental health status (PMH) and their interrelationships could provide vital data for the development of needed health promotion interventions in Nigerian universities. A brief review of related literature on the study's key concepts is presented in the subsequent sections.

Physical Activity
Physical activity is crucial for maintaining good health (Hallal et al., 2012). PA has been conceptualized as any bodily movement produced by skeletal muscles that requires energy expenditure and includes activities completed while working, playing, household chores and exercise, or sport (Craig et al., 2003). Adequate PA is associated with considerable health benefits in young people that can progress into adulthood (Hallal et al., 2012;Janssen & Leblanc, 2010;WHO, 2010). Young adults engage in PA for several reasons. The SLOTH (sleep, leisure-time, occupation, transportation, and home-based activities) model (Pratt et al., 2004) elucidates these reasons and describes the domains of PA. Young men's engagement in these activities contributes to their total daily PA.
Although the health-related PA guidelines expect young adults to be physically active in all areas of living, studies on PA levels among young men in Nigeria, especially in the university context are very scarce (Adeniyi et al., 2016;Odunaiya et al., 2010;Senbanjo & Oshikoya, 2010). Understanding the current PA levels among male university students could provide valuable information for effective PA promotion in a setting where such evidence is scarce or lacking (Bauman et al., 2012;Kohl et al., 2012). Additionally, understanding the association between PA levels and mental outcomes could prove vital information in the development and improvement of evidence-based public health interventions for fostering positive physical and mental health outcomes among male university students. Overall well-being, learning outcomes, and academic achievement could be enhanced in the Nigerian university context.

Psychological Well-being
Psychological well-being has been variously conceptualized. Ryff and Keyes (1995) viewed psychological well-being as a condition of positive functioning and a high level of personal satisfaction in the spheres of autonomy, environmental mastery, personal growth, and positive relations with other people. Similarly, Burns (2017) viewed "psychological well-being as the inter-and intraindividual levels of positive functioning that can include one's relatedness with others and self-referent attitudes that include one's sense of mastery and personal growth. Subjective well-being reflects dimensions of affect judgments of life satisfaction." Literature suggests that PWB comprises two main dimensions such as the hedonic perspective-the subjective experience of happiness (affect) and life satisfaction feeling good; and eudaimonic perspective, which covers positive psychological functioning, good relationships with others and self-realization (Ryan & Deci, 2001;Stewart-Brown, 2015). In the present study, both the hedonic and eudaimonic aspects of mental health were explored.
Based on the Ryff's multidimensional model of psychological well-being, the broad elements of eudaimonia has been used extensively in the literature (Ryff, 2014). The six dimensions of well-being include self-acceptance (SA), positive relations with others (PR), autonomy (AU), environmental mastery (EM), purpose in life (PL), and personal growth (PG). Self-acceptance implies the ability to have a positive attitude and feelings of satisfaction, and acceptance of self despite inherent limitations or deficiencies. PR exemplifies the subject's empathy and capacity to establish intimate, meaningful, and trusting relationships with others. AU implies a person's ability to control his/her behavior, resist social pressure, make independent decisions even if they at variance with other people's views. EM connotes the ability to create and manage situations conducive for mental conditions and daily activities; PL measures subject's intentionality and ability to set goals in life; PG represents the ability to develop one's potentials and readiness for new experiences and the feelings of improving over time (Gómez-López et al., 2019;Ryff, 1989;Ryff & Singer, 2008).
Prior studies have examined the association between PWB and demographic factors of gender, education, age, and socioeconomic factors with mixed results (Clarke et al., 2001;Lindfors et al., 2006;Ryff & Keyes, 1995). Findings reported that environmental mastery and autonomy increase with age while purpose in life, and personal growth decrease with age. Conversely, there were no age differences for self-acceptance. Furthermore, Ryff (1989), Ryff and Keyes (1995), Keyes et al. (2002) reported gender differences in the PWB dimensions of positive relations with others and personal growth. Similarly, persons with higher education are more likely to have high levels of psychological well-being, especially in relation to purpose in life and personal growth (Ryff et al., 2003). Regular PA is strongly linked to the experience of higher levels of dimensions of PWB in regular exercisers compared to non-exercisers (Edwards et al., 2005). However, none of the previous studies was conducted among male university students in Nigeria. It is unclear as to whether the dimensions of PWB are associated with demographic characteristics of Nigerian male university students. This research aims to explore the relationship between PA level and PWB.

Theoretical Framework
The self-determination theory (SDT)  posits that people have three basic psychological needs, such as competence, autonomy, and relatedness. This emphasizes that the attainment of these needs is crucial for psychological growth. The three basic needs underscore Ryff's six factors of psychological well-being. Specifically, other dimensions of PWB such as environmental mastery, purpose in life, and personal growth appear to accentuate need of competence which implies "feeling effective in one's ongoing interactions with the social environment and experiencing opportunities to exercise and express one's capacities" . The desire to fulfill these basic psychological needs can serve as the impetus for individuals to engage in PA as well as promote their psychological well-being (B Owen et al., 2014). However, the appreciation of the basic needs varied among individuals. This could explain why there are different levels of PA and PMH among individuals, including young university men. Nevertheless, the promotion of the basic psychological needs in the individuals could be a viable channel for encouraging young men to engage in PA. Consequently, regular, and adequate engagement in moderate to high PA could improve PMH in young university men.

The Present Study
Regardless of increasing evidence on the association between PA and PWB (Ahn & Fedewa, 2011;Adeniyi et al., 2016;Biddle et al., 2018;Dale et al., 2019;WHO, 2003), it is unclear whether PA, on its own, promotes PWB, or whether the association between PA and PWB is null among Nigerian young men. Understanding the relationships between PA and PWB could help Nigerian policymakers, mental health experts, and public health agencies focus on interventions aimed at increasing the PA level. This may decrease the young men's chances of developing mental illness (Harvey et al., 2010). A better understanding of the links between PA and PWB could spur evidence-based strategies for increasing PA levels; promoting and strengthening mental health promotion services for youths in Nigeria, since research evidence indicates that poor documentation and limited data hinder planning and adequate provision of mental health services for this subpopulation (Heath et al., 2012;Jacob et al., 2007). The availability of research evidence on the nexus between PA and PWB among Nigeria young men could be useful for future mental health surveillance and help to identify Nigerian young adults' populations at risk of PA inactivity and related harms. Besides, empirical evidence is needed to ascertain the PA levels, and PWB status of young men and explore these outcomes based on demographic characteristics to identify significant disparities that may occur within the subgroups. The objectives of the present study include: (1) determine the PA levels of male university students, (2) determine PWB status of male undergraduate students, (3) determine the relationship between PA and PWB among male students, and (4) determine whether the PA levels and domains of PWB are associated with age, year of study, ethnic origin and body mass index (BMI), among male students.

Study Design and Participants
The conduct and reporting of this survey adhered to the STROBE statement for cross-sectional studies (Vandenbroucke et al., 2007). Eligible participants were 19, 438 male students who were enrolled during the 2017/2018 academic session in a public university, Southeast Nigeria (National Universities Commission [NUC], 2018). The study was conducted in one of the main campuses of the university. The campus has nine faculties. These include the Faculties of Agriculture, Arts, Biological Sciences, Education, Engineering, Pharmaceutical Sciences, Physical Sciences, Social Sciences, and Veterinary Medicine. The sample size (n = 260) was determined using the Fischer's formula (n = (Z 2 pq)/d 2 ) as the population from which the sample size was drawn was more than 3000 (WHO, 1995). The prevalence of PA was 37% based on a previous study (Oyeyemi et al., 2017) with a 5% margin of error and 95% confidence level. The young men were recruited via random sampling to participate in the study. The participants' ages ranged from 18 to 30 years. The sample was representative of the male students registered at the University during the 2017/2018 academic year. The criteria for inclusion included young male adults enrolled as freshmen and old students in both full-time and part-time bachelor's degree program. Female students, students who enrolled for the diploma program, sub-degree program (Joint Universities Preliminary Examinations Board-JUPEB) or non-Nigerian students, or those who had already completed a bachelor's degree, were not included in the study. We conducted the survey between June 20 and September 27, 2018. The present study was conducted according to the stipulated guidelines in the (Blinded for Review). The flow chart for the selection and eligibility of the participants is shown in Figure 1.

Procedure
Permission was sought from the different departments in the Faculty of Education to access the students. The course representatives (i.e., class appointed/elected leaders) and the students were informed about the study. The researchers arranged a date and time to explain the study's purpose to the male students at the end of semesters' examinations. This period did not interfere with the regular academic sessions. Male students were given information sheets and consent forms to be completed before responding to the items in the questionnaires. The students who gave written consent were permitted to participate in the study, and they individually assented to Individuals who gave consent to participate in the study (n = 260) Participants who met the inclusion criteria (n = 252) Did not meet inclusion criteria (n = 5) Above age 30 (n = 3) Did not complete the survey (n = 9) Completed full survey (n = 243) participation in the study. The questionnaires were selfadministered in classroom settings under the supervision of the principal investigators to assist with any queries that might arise. The interviews were conducted on a date and time agreed upon by the participants and the researchers. It took approximately 30-40 min for the students to complete their responses. The principal investigators adhered to a strict procedure in the administration, processing, and use of the collected data. The total sample pool was 260. However, only 243 students (93.5% response rate) completed the study. The remaining 17 students did not have the complete information required for data analysis.
Measures. All the participants were requested to complete self-report questionnaires. These include the sociodemographic profile form, the International Physical Activity Questionnaire (IPAQ-SF), and Ryff's Scale Psychological Well-Being (PWB). The young men's height (cm) and weight (kg) measurements were taken for computation of the BMI.
Physical Activity. Physical activity was measured using the short form of the IPAQ-SF. The IPAQ instruments are available from www.ipaq.ki.se. The IPAQ is a selfreported questionnaire that accounts for the duration of different levels of PA for the past seven days or a week. The short form is a dimension-based instrument. The questionnaire is structured to capture physical activity in four fundamental domains of PA, namely vigorous, moderate, walking, and sitting. Each type of PA was assigned an intensity code in units of METs (e.g., 3.3, 4.0, & 8.0) (Craig et al., 2003). Estimation of energy expenditure was obtained multiplying the MET score by the number of minutes per week spent in each activity. The score on sitting was not included in any summary score of PA (Craig et al., 2003). To achieve the health benefits of PA, Haskell et al. (2007) recommended that an individual should engage in at least 150 min per week of moderate-intensity PA. This corresponds to 600 MET-min/ week. Based on this recommendation, the male university students were classified into three groups: Low PA (insufficiently active/participants getting less than 600 MET-min/week), moderate PA/sufficiently active (600 to < 3,000 MET-min/week), and high PA (participants reporting more than ≥3,000 MET-min/week). The cutpoints for the categories were informed by previous studies (Craig et al., 2003;Rääsk et al., 2017;WHO, 2010). The IPAQ short version has been reported to be reliable and valid (Craig et al., 2003). The IPAQ-SF and IPAQ-LF have been validated and translated in previous Nigerian studies (Oyeyemi et al., 2013;2014). In this study, the Cronbach alpha coefficient for the IPAQ-SF scale was .79 (Supplemental File S1).
Psychological Well-Being. Ryff's psychological wellbeing scale (Ryff, 1989, Ryff & Keyes, 1995 was used to measure PWB and its different dimensions. The Ryff's PWB measures psychological well-being (PWB) and covers six dimensions: self-acceptance, positive relations with others, autonomy, environmental mastery, purpose in life and personal growth. Items illustrating each dimension are as follows: "I like most aspects of my personality" (self-acceptance, n = 7; α = .76), "Maintaining close relationships has been difficult and frustrating for me" (positive relations, n = 7; α = .50), "I tend to be influenced by people with strong opinions" (autonomy, n = 7; α = .71), "I am quite good at managing the responsibilities of my daily life" (environmental mastery, n = 7; α = .68), "I sometimes feel as if I've done all there is to do in life" (purpose in life, n = 7; α = .60) and "For me, life has been a continuous process of learning, changing, and growth" (personal growth, n = 7; α = .61). There are 20 positively worded items and 22 negatively worded items in the PWB scale (Supplemental Files 2 and 3). Before data analysis, items with negative content were reverse scored so that high values indicated well-being. The different dimensions are mixed into a single 42-item measure. Participants were requested to indicate how precisely each item describes them by rating on a 6-point Likert scale ranging from "disagree strongly" to "agree strongly." Scores are calculated for the different domains of PWB with higher scores indicating higher levels of psychological well-being (Ryff & Keyes, 1995).
Sociodemographic Characteristics. Sociodemographic data included age in years, current academic level/year of study, and ethnic origin. We coded the participants' age in years, both continuously and as a polytomous variable. These include younger adults (18-22 years) coded as 1, intermediate young adults (23-26 years) coded as 2 and older young adults (27-30 years) coded as 3. The academic level/year of study was categorized into four groups. Year one (100 Level coded as 1), Year two (200 Level coded as 2), Year three (300 Level coded as 3), and Year four (400 Level coded as 4). Ethnic origin/ethnicity was coded 1 for Igbo, 2 for Yoruba, 3 for Hausa/ Fulani, and 4 for others while the academic program was dichotomized as the regular program (coded as 1) and sandwich/part-time program (coded as 2). The covariates were selected based on previous studies, which focused on demographic and socioeconomic correlates of health and well-being (Lundqvist & Mäki-Opas, 2016;Stranges et al., 2014).
Weight Status. Physical educators and health educators measured all the body parameters. Participants' body height and weight were measured after filling the questionnaires. Height was measured in the stand-ing position to the nearest 0.1 cm using Harpenden Portable Stadiometer (Holtain Model 603VR). Bodyweight was measured with minimal clothing with SECA 813 electronic scale (non-medical) to the nearest 0.1 kg. Participants were requested to remove shoes and heavy clothing such as cardigan and sweaters because the measurements were taken during the cold season (July-August). Based on the recommended guidelines, we adjusted bodyweight measures by subtracting 0.3 kg to account for clothing (Dalene et al., 2018). Thereafter, BMI was computed as the body mass divided by the square of body height (kg/m 2 ). The BMI categories were defined based on the commonly accepted cut-off points, that is, BMI <18.5 kg/m 2 for underweight, 18.5 to 24.99 kg/ m 2 for a healthy weight, 25.0 to 29.99 kg/m 2 for overweight, and ≥30 kg/m 2 for obese (WHO, 2000).

Statistical Analysis
The preliminary analysis was conducted to identify outliers, coding error, and missing value points on the participants' questionnaire items. Next, the main variables were examined concerning the normal and bivariate assumption of distribution. Pearson's product-moment correlation coefficients were computed to examine intercorrelations between PA (Total MET-min/week), PWB, and their dimensions. Pearson's χ 2 test, independent samples t-test and univariate ANOVA with a posthoc test (Bonferroni method) were used to explore differences in the mean PA scores (i.e., total MET-min/ week), PA levels (i.e., low PA, moderate PA, and high PA) in relation to PWB, and across all subgroups which included age, year of study, academic program type, ethnicity, and BMI. We also examined differences in the total mean PWB and subscale scores by participants' demographics and BMI.
We conducted a preliminary evaluation of the multicollinearity test to detect if there is a high correlation among predictor variables (i.e., ≥.80) (Tabachnick & Field, 2013). Additional analysis for multicollinearity was conducted using the variance inflation factor (VIF). A variable with VIF < 5 indicates a potential presence of collinearity of that variable with other variables in the model. There was no violation of the assumptions for multicollinearity (Supplemental Files 4 and 5). The assumptions for multicollinearity were met for the study variables. Cohen's (1988) criteria were adopted to interpret the effect size, signifying that the effect was small when η 2 = 0.01 (d = 0.20), medium when η 2 = 0.059 (d = 0.50), and large when η 2 = 0.138 (d = 0.80). Hierarchical multiple linear regression was used to analyze the associations of PA, PWB, and participants' demographic characteristics (Supplemental file 6). A p-value ≤ .05 was considered statistically significant.
For each model, individuals with missing values in variables were removed. All analyses were conducted using IBM Statistical Package for Social Science (SPSS) version 25.0 for Windows (IBM, Armonk, NY, USA).

Descriptive Statistics and Pearson's Correlations
The participants' demographic characteristics are summarized in Table 1. The findings of descriptive statistics such as mean, standard deviation, and Pearson's correlation analysis for determining the relationship level between the PA levels and PWB and its subdomains among male students are presented in Table 2. The data analysis showed that the total PA (MET-min/ week) was 1,923.7 (SD = 1,500.2), and the mean PWB score was 119.9 (SD = 23.64). The total PWB score suggests that the participants had moderate levels of PWB (Table 2). Another aim of this study was to examine the association between PA levels and PWB of university young men. According to the Pearson's correlation matrix (Table 2), TPA was not positively related with MWB (r = .06). PWB was weakly correlated to PWB (r = .13), and PWB dimensions such as self-acceptance (r = .13), autonomy (r = .26), and positive relations (r = .16). As regards the correlations of the dimensions of PWB, the results indicated positive associations among all the dimensions, with small values ranging from 0.20 (purpose in life) to 0.61 (positive interpersonal relationships) (Table 2). Similarly, PA has a significant positive relationship with PWB (p < .05). There were significant correlations among the levels of PA (r = .22 − .55). Table 2 further shows that the variables' skewness (between −0.11 and 2.00) and kurtosis (between −0.08 and 2.00) values are within the normal range of +2 to −2. Additionally, 16.0%, 64.2%, and 19.8% of the students had low, moderate, and high levels of PA, respectively (Table 3). The results of descriptive analysis of PWB subscales among male university students indicated that they had highest scores in positive relations (M = 25.75, SD = 6.10) and self-acceptance (M = 25.73, SD = 6.05) ( Table 3). The univariate ANOVA showed statistically significant differences on PA (total MET-min/week) among male undergraduates of different weight status (F 3, 239 = 3.061, p < .05; partial η 2 = 0.04). However, the results of the independent samples t-test and Pearson's χ 2 test conducted to compare all the variables according to the participants' demographic characteristics were not statistically significant (Table 4). The univariate ANOVA showed statistically significant differences on a subscale of PWB, which is personal growth (F 3, 239 = 2.089, p < .05; partial η 2 = 0.03). However, other results of the univariate ANOVA and independent samples t-test conducted to compare all the total mean PWB scores and the subscales according to the participants' demographic characteristics were not statistically significant (Table 5). Cohen's (1988) guidelines for interpretation of values of partial eta-squared were used. A value above .06 is considered a moderate effect size, and a value above .14 is considered a large effect size. The results of regression models showed that none of the demographic factors were associated with self-acceptance in model 1.
For self-acceptance Model 2, the total PA MET-min/week was significantly associated with self-acceptance (β = 0.13, p < .05). In model 3, higher vigorous METs/week was positively associated (β = −0.27, p < .05) with selfacceptance. For positive relations, the total PA MET-min/  week was found to be significantly associated with positive relations (β = 0.16, p < .05) and accounted for 2.5% of the variance in model 2. The total PA METmin/week was significantly associated with purpose in life (β = 0.39, p < .05) in Model 3. Vigorous PA METs showed significantly negative effect on personal growth (β = −0.28, p < .05) in model 3 and accounted for 2.0% of the variance (Table 6).

Main Findings
This study is the first to assess self-reported PA levels and explored the associations of young men's PA with PMH and demographic characteristics within the university setting in Southeast Nigeria. Despite the numerous mental and psychological health benefits associated with engagement in PA (Ahn & Fedewa, 2011;Adeniyi et al., 2016;Biddle et al., 2018;Dale et al., 2019;WHO, 2003), limited research has examined the association between PA and PWB within the context of university environment in Nigeria. The study findings showed that most participants had a moderate PA level (M =1923.7, SD = 1500.20). This finding is inconsistent with a previous study (Lapa, 2015) that reported a high level of PA among male university students. The discrepancies in the findings may be attributed to the fact that the study was among male and female university students in Turkey who have access to sports infrastructure that support adequate engagement in diverse forms of PA compared to male students in Nigeria with a shortage of quality Note. All post-hoc comparisons (Bonferroni's test); Low PA (< 600 MET-min/week); moderate PA (600 to < 3,000 MET-min/week); High PA (≥ 3,000 MET-min/week); df, degree of freedom; BMI, body mass index; Mod., moderate; p-values from χ 2 tests indicated possible associations between PA categories and sociodemographic variables; χ 2 (df), Pearson's χ 2 /degrees of freedom; F(df), F-ratio/ degrees of freedom; t (df), independent-samples t-test and degree of freedom; η 2 , partial eta squared; PTS b , part-time/sandwich; Others a , other tribes such as Igala, Idoma, Kanuri. *p ≤ .05.  Age (  Step 1 (β) Step 2(β) † Step 3(β) † † Step 1 (β) Step 2(β) † Step 3(β) † † Step 1 (β) Step 2(β) † Step 3 Step 1(β) unadjusted model. † Step 2 (β) adjusted for Age, academic level, ethnicity, academic program, BMI, and PA (Total MET-min/week). † † Step 3 (β) adjusted for domains/categories of physical activity (PA Step 1 (β) Step 2(β) † Step 3(β) † † Step 1 (β) Step 2(β) † Step 3(β) † † Step 1 (β) Step 2(β) † Step 3 Step 1 (β) unadjusted model. † Step 2 (β) adjusted for age, academic level, ethnicity, academic program, BMI, and PA (Total MET-min/week). † † Step 3 (β) adjusted for domains/categories of physical activity (PA facilities that could promote participation in PA. Thus, the university management must drive the enhancement of a high level of PA activity among university students via the device of better strategies for increasing students' participation in regular and adequate PA. The present study found that one-fifth and about two-thirds of the participants had high and moderate PA levels, respectively. The low proportion of young men with a high PA level in this study is a concern. This may suggest that male students face certain barriers to adequate participation in PA. Future research should investigate the barriers to PA participation among university students in Nigeria. The finding is consistent with previous studies (Lapa, 2015;Oyeyemi et al., 2013).
The finding further showed that young men had moderate levels of MWB and PWB. The results could be attributed to academic demands and stress, financial difficulties and other school environment-related factors (Fawzy & Hamed, 2017;Hiester et al., 2009), personal, political and socioeconomic alienation of youth in Nigeria (Ifeagwazi et al., 2015). This finding is inconsistent with a prior study (Lapa, 2015) that reported high levels of psychological well-being among the university students. University campuses may thus provide essential structures, support, and resources, including recreation facilities, and mental health services for promoting psychological well-being and overall well-being of the students (deJonge et al., 2020). Although Nigerian public universities lack adequate structures and resources to promote and support the mental well-being of the teeming student populations; collaboration with non-governmental organizations (NGOs), corporate bodies (e.g., banks, youth development agencies) may be important in providing these essential services.
Additionally, university-based mental health professionals such as health educators, sports psychologists, and clinical psychologists should educate the students on the available, appropriate and cost-effective interventions that could improve their mental health (Fibbins et al., 2019;Rowley et al., 2018). Further research is required to explore the mental health benefits of implementing integrated and multidisciplinary approaches for PA and mental health services for youth in the university environment (DeJonge et al., 2020). Future studies should explore the predictors (personal, school-level factors, environmental factors, etc.) of psychological well-being among university students and the contributory roles of universitybased mental health services and interventions in promoting students' psychological well-being in Nigeria.
In the present study, PA emerged as a significant predictor of PWB with its subdimensions-self-acceptance, positive relations, purpose in life and personal growth. Although the strength of the association is weak, the finding confirmed the central study hypothesis. The finding is consistent with the literature (Biddle et al., 2018;Dale et al., 2019;Edwards, 2006;Huppert, 2009;McMahon et al., 2017;Nicole et al., 2013). A plausible explanation for the weak association could be the low level of PWB among the participants. Also, other confounders such as a dearth of sports facilities, peer influence, and personality traits might have influenced the participants' engagement in PA. This could indirectly impinge on their psychological well-being. The self-determination theory (SDT) may have partially explained this association. The desire of young men to fulfill their basic psychological needs could prompt engagement in PA. Since engagement in PA has the potential to improve PWB, the observed association in this study is plausible. Future studies may endeavor to explore the link between PA and PWB with empirical evidence based on SDT. Besides BMI, there were no significant results of demographic factors with total PA score (TPA MET-min/week) or PA levels Since limited data exists about PA and its associations with dimensions of PWB, especially in Nigerian young men, the association between PA and dimensions of PWB could be a new area in studies that focus on adolescents and youth mental health in Nigeria. This study fills the gap in this area of studies. This finding suggests that a high level of physical activity in young adult males may have the potential to decrease their risk of psychological problems. In other words, young men with higher TPA MET-min/week may have more beneficial effects. Hence, physical activity could be a protective factor for psychological distress in male university students (Haskell et al., 2007;Heath et al., 2012).

Limitations and Directions for Further Studies
The study has contributed to the literature on associations between PA and PWB in young university men. However, there are some limitations. First, the cross-sectional design does not permit causal inferences or confirm directions of associations. Future studies should consider a longitudinal examination of the associations between different modes of PA and PWB. The study made use of validated selfreport measures that are susceptible to recall bias, overestimation or underreporting of PA, varying interpretations of PA in diverse social-cultural contexts, and age groups (Hallal et al., 2012). Although the use of objective measures of PA in large-scale studies is costly and faces several challenges in LMICs, future studies should endeavor to measure PA objectively with relatively small samples. Some unobserved individual and school-related factors are not considered in the present study, which may have confounded the findings. Further research should include additional and unexplored variables that could help explain the association between PA and PWB in young men. The use of male students in an institutionalized setting (university environment) may limit the generalizability of findings. Future studies should sample young male adults outside of university settings. Also, future studies should explore potential mediators between PA engagement and psychological well-being among young men.

Conclusion
The findings of this study showed that male university students were sufficiently active with a moderate level of psychological well-being. The findings showed that PA is significantly associated with PWB among the students. The finding may be useful for the development of evidence-based interventions by public health experts, health education experts, physical educators, school counselors, psychologists, and others that give care to young men who are vulnerable to intense academic stress and demands. The findings from this study suggest that moderate to high levels of PA may be important for achieving a high level of psychological well-being in male university students. Given the strength of these findings, the results can help public health experts, health educators, and physical educators develop future physical activity and psychosocial interventions that emphasize the promotion of PA and psychological health. Such interventions could boost young adults' resilience to academic stress, emotional difficulties, and enhance academic achievement.

Declaration of Conflicting Interests
The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Funding
The author(s) received no financial support for the research, authorship, and/or publication of this article.

Ethical Statement
The present study was conducted according to the stipulated guidelines in the Declaration of Helsinki and all procedures involving human subjects. Ethical approval of research was granted by the Faculty of Education Research Ethics Committee, University of Nigeria, Nsukka (Approval Reference #: ERA-018). We obtained written, informed consent from all the participants.

Supplemental Material
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