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Accuracy of Accelerometers during High Intensity Body Weight Resistance Training: 1975 Board #127 June 2, 2: 00 PM - 3: 30 PM.

Accelerometers have been found to accurately measure steps and caloric expenditure during walking and running activities. They may fail to detect small, quick movements during agility exercises leading to underestimated energy expenditure. Circuit-style body-weight resistance training (BWRT) has become increasingly popular because it is inexpensive and effective in improving muscular strength and cardiovascular fitness. However, there is lack of evidence that accelerometers can accurately detect energy expenditure during this exercise modality. Additionally, little is known regarding the extent to which participants can accurately estimate caloric expenditure in the absence of an objective physical activity monitor. PURPOSE: To evaluate the accuracy of five accelerometers (2 wrist-, 1 waist-, and 2 hip-mounted) in estimating energy expenditure while performing an acute bout of BWRT, and to assess individuals’ perceived estimated caloric expenditure during the bout. METHODS: Participants (N=8) underwent baseline testing (resting heart rate, blood pressure, body composition, and VO2 max). At least 48 hours later, each participant completed the main test: a 15 minute workout consisting of 12 repetitions each of air squats, sit-ups, push-ups, lunges, pull-ups, steps-ups, and high knees; performed circuitstyle by completing as many rounds as possible. During the main test, each participant wore a portable metabolic analyzer (PMA) and five different accelerometers. Intensity was standardized (60-80% of VO2 max) by monitoring breath-by-breath VO2. RESULTS: Four of the five accelerometers reported lower (p<0.01) total caloric expenditure values compared to the PMA during the acute bout of BWRT. The waist-mounted accelerometer (175.38 kcals ± 16.06 SEE) most closely mimicked caloric expenditure compared to the PMA (154.78 kcals ± 8.84 SEE) as indicated by an insignificant p value (0.056). Participants over-estimated their caloric expenditure by ~38% (participants estimation = 215.00 kcals ± 32.69 SEE). CONCLUSIONS: The wristand hip-mounted accelerometers do not accurately assess energy expenditure during BWRT exercise. Supported by: WKU Graduate School and NIH NIGMS 2P20GM103436-14.