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Assessing body composition before and after resistance or endurance training

Authors :
Craig E. Broeder
Joseph Volpe
Lars S. Svanevik
Keith A. Burrhus
Jack H. Wilmore
Source :
Medicine &amp Science in Sports &amp Exercise. 29:705-712
Publication Year :
1997
Publisher :
Ovid Technologies (Wolters Kluwer Health), 1997.

Abstract

This study's purpose was to determine the validity of near-infrared interactance (NIR) and bioelectric impedance (BIA) in tracking changes in body composition over 12 wk of either a high intensity endurance (ET) or resistance (RT) training program in nondieting weight-stable untrained males. Prior to and following the control or training period, each subject completed a series of body composition analyses including hydrostatic weighing (HW) with a measurement of residual volume: anthropometric measurements including height, weight, skinfold, and girth: BIA measurement: and NIR measurements. Based on the HW results, there were no significant body composition changes in the control group. For the ET group, a significant decline in relative body fat resulted from a reduction in fat weight (FW) with no change in fat-free weight (FFW). In the RT group, both a significant decline in FW and an increase in FFW contributed to this group's decline in relative body fat. Tracking changes in relative body fat, FW, and FFW, skinfolds agree reasonably well with HW in all groups while BIA and NIR did not always track body composition changes well. For example, SF and BIA were significantly correlated with the changes in FFW (HW = +4.1%, SF = +4.5%. BIA = +3.1%. NIR = -0.7%) observed in the RT group compared to HW (SF: r-value = 0.45, SEE = 2.5; BIA: r = 0.33, SEE = 3.4) while the NIR measurements were nonsignificant (r = 0.09, SEE = 5.0). Interestingly, NIR underestimated the gain in FFW in the resistance trained group while BIA underestimated the changes in relative body fat. FW, and FFW in the endurance trained group. Based on these results, BIA and NIR appear not to be appropriate measurement tools for tracking body composition changes in endurance and resistance training individuals respectively.

Details

ISSN :
01959131
Volume :
29
Database :
OpenAIRE
Journal :
Medicine &amp Science in Sports &amp Exercise
Accession number :
edsair.doi.dedup.....858a86634a3cd058ba38a0729ace4f8c
Full Text :
https://doi.org/10.1097/00005768-199705000-00019