What question did this study set out to answer?

To examine the effects of a daily mixed nutritional supplement on body composition, physical performance, and anabolic hormone levels in soldiers undergoing 8 weeks of arduous training.

December 1, 2011Applied Physiology Nutrition and Metabolism

Effects of a daily mixed nutritional supplement on physical performance, body composition, and circulating anabolic hormones during 8 weeks of arduous military training

View Full Paper

Ask AI

Bookmark

Authors

MFMatthew B. FortesBangor University BDBethany C. DimentBangor University JGJulie P. GreevesUniversity of East Anglia

Discussion

Member takes

Implication

Controlled trial shows that daily nutritional supplementation preserves strength and blunts lean mass loss in soldiers, indicating extra energy intake mitigates extreme physical training strain.

Key Points

To examine the effects of a daily mixed nutritional supplement on body composition, physical performance, and anabolic hormone levels in soldiers undergoing 8 weeks of arduous training.
Assigned 30 male soldiers to either a habitual diet control group (CON, n = 15) or a supplemented group receiving an additional ~5.1 MJ·d⁻¹ (SUP, n = 15) over 8 weeks of military training.
Assessed body composition via dual-energy x-ray absorptiometry (DEXA), maximal dynamic lift strength (MDLS), and vertical jump (VJ) before and after training.
Measured pre- and post-training resting serum concentrations of insulin-like growth factors (IGF-1, IGF BP-1, IGF BP-3), testosterone, and cortisol.
Supplementation significantly blunted reductions in body mass (CON: 5.0 ± 2.3 kg vs SUP: 1.6 ± 1.5 kg), lean mass (CON: 2.0 ± 1.5 kg vs SUP: 0.7 ± 1.5 kg), and fat mass (CON: 3.0 ± 1.6 kg vs SUP: 0.9 ± 1.8 kg).
Nutritional supplementation prevented performance declines observed in controls, who experienced reductions in dynamic lift strength (14%), vertical jump (10%), and explosive leg power (11%).
Military training decreased IGF-1 by 28%, testosterone by 19%, and the testosterone:cortisol ratio by 24% regardless of supplementation, though the supplement prevented a 20% decline in IGF BP-3.

Cite This Study

Fortes et al. (2011) studied this question.

synapsesocial.com/papers/6a1e87ee40bc8a3dd769064f https://doi.org/10.1139/h11-124

View Full Paper

Ask AI

Bookmark

Implication

Controlled trial shows that daily nutritional supplementation preserves strength and blunts lean mass loss in soldiers, indicating extra energy intake mitigates extreme physical training strain.

Effects of a daily mixed nutritional supplement on physical performance, body composition, and circulating anabolic hormones during 8 weeks of arduous military training

Discussion

Member takes

Implication

Key Points

Cite This Study

Effects of a daily mixed nutritional supplement on physical performance, body composition, and circulating anabolic hormones during 8 weeks of arduous military training

Discussion

Member takes

Implication

Key Points

Cite This Study

Also Consider

Also Consider