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Abstract

International Journal of Exercise Science 11(2): 640-647, 2018. The purpose of this study was to determine the time course of BIA-derived body fat percentage (BF%) and total body water (TBW) values in the 1 h following a moderate bout (60% heart rate reserve [HRR]) of steady state aerobic exercise in apparently healthy men. College-aged adult males (n=15) had their BF% and TBW estimated via BIA before (PRE), immediately (IP), 10 min (10P), 20 min (20P), 30 min (30P), 40 min (40P), 50 min (50P), and 60 min (60P) post a 30 min bout of moderate treadmill exercise. Exercise intensity was 60% of subjects’ HRR. Compared to PRE values, BIA-derived BF% and TBW were significantly lower and higher, respectively, from IP-30P (all p<0.05). However, BF% and TBW values for 40P-60P were not statistically significant compared to PRE (all p>0.05). The 95% limits of agreement for BF% and TBW were narrowest for IP (±1.5%; ±0.5kg) and widest at 50P (±2.1%; ±0.7kg), respectively. The time periods that produced significantly different BF% and TBW values (i.e., IP, 10P, 20P, and 30P) had smaller 95% limits of agreement than the time periods that produced non-significantly different mean values (i.e., 40P, 50P, and 60P). The 12 h recommendation of avoiding aerobic exercise prior to BIA testing appears to be too stringent. Results from the current study found that BIA-derived BF% and TBW measured at 40P, 50P and 60P were similar to PRE. Furthermore, if BIA is used after aerobic exercise, but prior to 40P, practitioners should consider adjusting for the systematic error (e.g., increase BIA-derived BF% IP by 2.3%).

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