Sex Does Not Affect Changes in Body Composition and Insulin-Like Growth Factor-I During US Army Basic Combat Training.

Autor:	Roberts BM; Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts., Staab JS; Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts., Caldwell AR; Thermal & Mountain Medicine Division, US Army Research of Environmental Medicine, Natick, Massachusetts., Sczuroski CE; Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts., Staab JE; Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts., Lutz LJ; Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts., Reynoso M; Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts., Geddis AV; Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts., Taylor KM; Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts., Guerriere KI; Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts., Walker LA; Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts., Hughes JM; Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts., Foulis SA; Military Performance Division, US Army Research of Environmental Medicine, Natick, Massachusetts.
Jazyk:	angličtina
Zdroj:	Journal of strength and conditioning research [J Strength Cond Res] 2024 Jun 01; Vol. 38 (6), pp. e304-e309. Date of Electronic Publication: 2024 Feb 06.
DOI:	10.1519/JSC.0000000000004735
Abstrakt:	Abstract: Roberts, BM, Staab, JS, Caldwell, AR, Sczuroski, CE, Staab, JE, Lutz, LJ, Reynoso, M, Geddis, AV, Taylor, KM, Guerriere, KI, Walker, LA, Hughes, JM, and Foulis, SA. Sex does not affect changes in body composition and insulin-like growth factor-I during US Army basic combat training. J Strength Cond Res 38(6): e304-e309, 2024-Insulin-like growth factor 1 (IGF-I) has been implicated as a biomarker of health and body composition. However, whether changes in body composition are associated with changes in IGF-I is unclear. Therefore, we examined the relationship between body composition changes (i.e., fat mass and lean mass) and total serum IGF-I levels in a large cohort of young men ( n = 809) and women ( n = 397) attending US Army basic combat training (BCT). We measured body composition using dual energy x-ray absorptiometry and total serum IGF-I levels during week 1 and week 9 of BCT. We found that pre-BCT lean mass ( r = 0.0504, p = 0.082) and fat mass ( r = 0.0458, p = 0.082) were not associated with pre-BCT IGF-I. Body mass, body mass index, body fat percentage, and fat mass decreased, and lean mass increased during BCT (all p < 0.001). Mean (± SD ) IGF-I increased from pre-BCT (176 ± 50 ng·ml -1 ) to post-BCT (200 ± 50 ng·ml -1 , p < 0.001). Inspection of the partial correlations indicated that even when considering the unique contributions of other variables, increases in IGF-I during BCT were associated with both increased lean mass ( r = 0.0769, p = 0.023) and increased fat mass ( r = 0.1055, p < 0.001) with no sex differences. Taken together, our data suggest that although changes in IGF-I weakly correlated with changes in body composition, IGF-I, in isolation, is not an adequate biomarker for predicting changes in body composition during BCT in US Army trainees. (Copyright © 2024 National Strength and Conditioning Association.)
Databáze:	MEDLINE
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