习惯性蛋白质摄入量对职业消防员身体成分和肌肉力量的影响。
The Influence of Habitual Protein Intake on Body Composition and Muscular Strength in Career Firefighters.
机构信息
a Applied Physiology Laboratory, Department of Exercise and Sport Science , University of North Carolina , Chapel Hill , North Carolina , USA.
b Human Movement Science Curriculum, Department of Allied Health Science , University of North Carolina , Chapel Hill , North Carolina , USA.
出版信息
J Am Coll Nutr. 2018 Sep-Oct;37(7):620-626. doi: 10.1080/07315724.2018.1455071. Epub 2018 Apr 27.
OBJECTIVE
The aim of this research was to determine the relationship among protein (PRO) intake, body composition, and muscle strength in overweight and obese firefighters. A secondary objective was to evaluate differences in body composition and muscle strength among overweight and obese firefighters with low (L; < 0.8 g·kg), moderate (M; 0.8-1.0 g·kg), and high (H; > 1.0 g·kg) PRO intake.
METHODS
Relative PRO intake [r_PRO] was evaluated from 3-day dietary logs, self-reported by 43 overweight and obese male career firefighters (mean ± standard deviation; age = 37.3 ± 7.2 years; body mass index = 33.2 ± 5.0 kg·m; percent body fat [%BF] = 28.9 ± 4.0%). Body composition (fat mass [FM], %BF, lean mass [LM], percent LM [%LM]) and muscle strength (peak torque [PT], relative peak torque [r_PT] of the leg extensors) were measured using dual-energy x-ray absorptiometry and isokinetic dynamometry, respectively.
RESULTS
Greater r_PRO was associated with less FM, %BF, LM (r = -0.498 to -0.363) and greater %LM (r = 0.363), but not muscle strength (p > 0.05). Fat mass (r = -0.373) and %BF (r = -0.369) were associated with lower r_PT; %LM was associated with greater r_PT (r = 0.373). Individuals with L r_PRO had greater FM (mean difference ± standard error: L-H = 10.08 ± 3.18 kg), %BF (L-H = 3.8% ± 1.4%) and lower %LM (L-H = -3.7% ± 1.3%) than those with H r_PRO (p < 0.05) but no significant differences in muscle strength (p > 0.05).
CONCLUSIONS
Protein intake > 0.8 g·kg was associated with more favorable body composition in male career firefighters.
目的
本研究旨在确定超重和肥胖消防员的蛋白质（PRO）摄入、身体成分和肌肉力量之间的关系。次要目的是评估 PRO 摄入量低（L；<0.8g·kg）、中（M；0.8-1.0g·kg）和高（H；>1.0g·kg）的超重和肥胖消防员之间的身体成分和肌肉力量的差异。
方法
通过 3 天的饮食记录（由 43 名超重和肥胖的男性职业消防员自我报告）评估相对 PRO 摄入[r_PRO]，这些消防员的平均年龄为 37.3 ± 7.2 岁，平均体重指数为 33.2 ± 5.0kg·m，平均体脂百分比（%BF）为 28.9 ± 4.0%。使用双能 X 射线吸收法测量身体成分（脂肪量[FM]、%BF、瘦体重[LM]、%LM）和肌肉力量（腿部伸肌的峰值扭矩[PT]、相对峰值扭矩[r_PT]）。
结果
r_PRO 与 FM、%BF、LM（r=-0.498 至-0.363）和%LM（r=0.363）减少相关，但与肌肉力量无关（p>0.05）。FM（r=-0.373）和%BF（r=-0.369）与较低的 r_PT 相关；%LM 与较高的 r_PT 相关（r=0.373）。与 H r_PRO 相比，r_PRO 低的个体具有更大的 FM（均值差异±标准误差：L-H=10.08±3.18kg）、%BF（L-H=3.8%±1.4%）和较低的%LM（L-H=-3.7%±1.3%）（p<0.05），但肌肉力量无显著差异（p>0.05）。
结论
PRO 摄入量>0.8g·kg 与男性职业消防员更有利的身体成分有关。
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