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Influence of Exercise Time of Day on Salivary Melatonin Responses: 2158 Board #310 June 2, 3: 30 PM - 5: 00 PM.

The purpose of this study was to examine the effects of 10 weeks of whole-body vibration on balance, lower body muscular strength, and bone mineral density in women. The study was comprised of two groups: whole body vibration (WBV, n = 19) and control (CON, n = 16). Both groups completed a 10-week WBV program. The WBV group received a vibratory stimulus while performing lower extremity exercises. The CON group performed the same protocol without vibration. Data were collected on balance, muscular strength and bone mineral density. Two, factorial MANOVAs were used to analyze the data with a significance level of .05. Isometric strength of the quadriceps increased significantly for both groups. The improvement in strength was significantly greater in the WBV group (pre: 128.7 ± 50.8 ft•lb, post: 157.7 ± 51.9 ft•lb) compared to the control group (pre: 129.3 ± 33.9 ft•lb, post: 136.5 ± 33.8 ft•lb). No significant differences were observed between the groups for any other variables. Both groups showed significant improvements over time in the adaptation test (WBV pre: 61.53 ± 3.28 deg/s, post: 52.74 ± 3.37 deg/s; CON pre: 68.19 ± 3.6 deg/s, post: 65.44 ± 3.67 deg/s) and the rising index of the sit-to-stand test (WBV pre: 29.32 ± 9.2 %BW, post: 31.32 ±10.5 %BW; CON pre: 29.81 ± 9.4 %BW, post: 33.3 ± 7.9 %BW). In conclusion, adding WBV to a lower extremity exercise program appears to improve lower body muscular strength. 2160 Board #312 June 2, 3:30 PM 5:00 PM Association between Physical Activity and Depression: The Exercise for Persons Who Are Immunocompromised (EPIC) Study Sanaz Nosrat, James W. Whitworth, Nicholas J. SantaBarbara, Jordan E. Labrec, Joseph T. Ciccolo. Teachers College, Columbia University, New York, 10027, NY. (Sponsor: Carol Ewing Garber, FACSM) Email: sn2504@tc.columbia.edu (No relationships reported) BACKGROUND: The prevalence of major depressive disorder and depressive symptoms is higher in people living with HIV (PLWH) than in their seronegative counterparts. Evidence suggests that depression may negatively affect the progression of HIV, and that it is associated with reduced medication adherence. Physical inactivity is hypothesized to be associated with poorer mental health in general population; however, this relationship is less examined among PLWH. PURPOSE: This study explored the cross-sectional relationship between self-reported physical activity levels and depressive symptoms in a community sample of PLWH. METHODS: Baseline data collected from a trial testing the acute effects of resistance exercise in PLWH were used. Participants were 15 males and 6 females ages 32-61 (M=49.4, SD=9.2) who completed questionnaires relating to their physical activity and mental health. Physical activity was assessed with the interview version of the pastweek Modifiable Activity Questionnaire (MAQ); depressive symptoms were measured with the Center for Epidemiologic Depression Scale (CES-D) and the Patient Health Questionnaire (PHQ-9). Height and weight were measured using standard procedures, and body mass index (BMI) was calculated. Participants were classified as completely sedentary: no physical activity reported in the past 7 days (n=9); or leisurely active: any leisure activity reported in the past 7 days (n=12). Group differences were analyzed using t-tests with significance level set at p<.05. RESULTS: The leisurely active group had significantly lower CES-D (t=-2.65, p=.02) and PHQ-9 (t=-2.46, p=.02) scores than the sedentary group. There were no significant differences for BMI between the two groups. CONCLUSION: The results of this study suggest a significant inverse association between physical activity and depressive symptoms among PLWH. Future studies will be required to examine the direction of the effects, and the mechanisms that may be involved in the relationship between physical activity and depressive symptoms in PLWH. Copyright © 2016 by the American College of Sports Medicine. Unauthorized reproduction of this article is prohibited.