Relationships Between Body Composition and Performance in the High-Intensity Functional Training Workout "Fran" are Modulated by Competition Class and Percentile Rank.

Autor:	Mangine GT; Exercise Science and Sport Management, Kennesaw State University, Kennesaw, GA, United States., McDougle JM; Exercise Science and Sport Management, Kennesaw State University, Kennesaw, GA, United States.; Kinesiology, University of Connecticut, Storrs, CT, United States., Feito Y; Exercise Science and Sport Management, Kennesaw State University, Kennesaw, GA, United States.; American College of Sports Medicine, Indianapolis, IN, United States.
Jazyk:	angličtina
Zdroj:	Frontiers in physiology [Front Physiol] 2022 May 27; Vol. 13, pp. 893771. Date of Electronic Publication: 2022 May 27 (Print Publication: 2022).
DOI:	10.3389/fphys.2022.893771
Abstrakt:	This study examined relationships between body composition and high-intensity functional training (HIFT) workout performance. Fifty-seven men (31.4 ± 6.9 years, 177.2 ± 7.5 cm, 84.7 ± 8.5 kg) and thirty-eight women (29.2 ± 6.4 years, 166.6 ± 6.1 cm, 66.5 ± 7.7 kg) with HIFT experience (≥6 months) reported completing "Fran" (21-15-9 repetitions of barbell thrusters and pull-ups) in 4.78 ± 2.22 min and 6.05 ± 2.84 min, respectively, and volunteered to complete dual-energy X-ray absorptiometry assessments. Participants were grouped by competition class (men, women, master's men, master's women) and percentile rank in "Fran" (≤25th percentile, 25-75th percentiles, ≥75th percentile). Two-way analyses of variance revealed expected differences ( p < 0.001) between men and women in non-bone lean mass (NBLM), fat-free mass index, and fat mass, and more NBLM (10.6-10.8 kg) and less fat mass (2.7-5.2 kg) in >75th percentile compared to other percentiles. Most body composition measures were significantly ( p < 0.05) related to performance in men and women but limited in master's men; no relationships were seen in master's women. "Fran" time was negatively correlated to NBLM and fat-free mass index in all percentile groups ( ρ = -0.37 to -0.64) and bone mineral characteristics for >25th percentile ( ρ = -0.41 to -0.63), and positively correlated to fat mass in 25-75th percentiles ( ρ = 0.33-0.60). No other relationships were seen in ≤25th percentile. The influence of body composition on "Fran" time appears to vary by both competition class and percentile rank. Though training to increase lean mass always seems relevant, reducing body fat only appears relevant in mid-skilled trainees and when it is outside healthy parameters. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2022 Mangine, McDougle and Feito.)
Databáze:	MEDLINE
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