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Nutrients. 2018 Sep 6;10(9). pii: E1248. doi: 10.3390/nu10091248.

Effect of Whey Protein Supplementation on Physical Performance and Body Composition in Army Initial Entry Training Soldiers.

Author information

1
Warrior Research Center, School of Kinesiology, Auburn University, Auburn, AL 36849, USA. jsm0039@auburn.edu.
2
Warrior Research Center, School of Kinesiology, Auburn University, Auburn, AL 36849, USA. kdm0031@auburn.edu.
3
Molecular and Applied Sciences Laboratory, School of Kinesiology, Auburn University, Auburn, AL 36849, USA. dbeck@auburn.vcom.edu.
4
Department of Cell Biology and Physiology, Edward Via College of Osteopathic Medicine (Auburn Campus), Auburn, AL 36849, USA. dbeck@auburn.vcom.edu.
5
Molecular and Applied Sciences Laboratory, School of Kinesiology, Auburn University, Auburn, AL 36849, USA. cth0023@auburn.edu.
6
Molecular and Applied Sciences Laboratory, School of Kinesiology, Auburn University, Auburn, AL 36849, USA. mzr0049@auburn.edu.
7
Molecular and Applied Sciences Laboratory, School of Kinesiology, Auburn University, Auburn, AL 36849, USA. pwm0009@auburn.edu.
8
Molecular and Applied Sciences Laboratory, School of Kinesiology, Auburn University, Auburn, AL 36849, USA. par0021@auburn.edu.
9
Molecular and Applied Sciences Laboratory, School of Kinesiology, Auburn University, Auburn, AL 36849, USA. kyoung@auburn.vcom.edu.
10
Department of Cell Biology and Physiology, Edward Via College of Osteopathic Medicine (Auburn Campus), Auburn, AL 36849, USA. kyoung@auburn.vcom.edu.
11
Neurorehabilitation Informatics Lab, Department of Health, Kinesiology, & Recreation, University of Utah, Salt Lake City, UT 84112, USA. Keith.Lohse@health.utah.edu.
12
Lockwood LLC, Draper, UT 84020, USA. chris@drchrislockwood.com.
13
Molecular and Applied Sciences Laboratory, School of Kinesiology, Auburn University, Auburn, AL 36849, USA. mdr0024@auburn.edu.
14
Department of Cell Biology and Physiology, Edward Via College of Osteopathic Medicine (Auburn Campus), Auburn, AL 36849, USA. mdr0024@auburn.edu.
15
Warrior Research Center, School of Kinesiology, Auburn University, Auburn, AL 36849, USA. jms0018@auburn.edu.

Abstract

We investigated the effects of whey protein (WP) supplementation on body composition and physical performance in soldiers participating in Army Initial Entry Training (IET). Sixty-nine, male United States Army soldiers volunteered for supplementation with either twice daily whey protein (WP, 77 g/day protein, ~580 kcal/day; n = 34, age = 19 ± 1 year, height = 173 ± 6 cm, weight = 73.4 ± 12.7 kg) or energy-matched carbohydrate (CHO) drinks (CHO, 127 g/day carbohydrate, ~580 kcal/day; n = 35, age = 19 ± 1 year, height = 173 ± 5 cm, weight = 72.3 ± 10.9 kg) for eight weeks during IET. Physical performance was evaluated using the Army Physical Fitness Test during weeks two and eight. Body composition was assessed using 7-site skinfold assessment during weeks one and nine. Post-testing push-up performance averaged 7 repetitions higher in the WP compared to the CHO group (F = 10.1, p < 0.001) when controlling for baseline. There was a significant decrease in fat mass at post-training (F = 4.63, p = 0.04), but no significant change in run performance (F = 3.50, p = 0.065) or fat-free mass (F = 0.70, p = 0.41). Effect sizes for fat-free mass gains were large for both the WP (Cohen's d = 0.44) and CHO (Cohen's d = 0.42) groups. WP had a large effect on fat mass (FM) loss (Cohen's d = -0.67), while CHO had a medium effect (Cohen's d = -0.40). Twice daily supplementation with WP improved push-up performance and potentiated reductions in fat mass during IET training in comparison to CHO supplementation.

KEYWORDS:

basic training; military; nutrition; recovery; soldiers

PMID:
30200582
PMCID:
PMC6165280
DOI:
10.3390/nu10091248
[Indexed for MEDLINE]
Free PMC Article

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