No effect of increasing protein intake during military exercise with severe energy deficit on body composition and performance
| Autor: | Benjamin James Knox, Ina Garthe, Sjur Johansen Øfsteng, Silje Knox, Kirsi Helkala, Stian Ellefsen, Øyvind Jøsok, Bent R. Rønnestad |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Male
Physical Therapy Sports Therapy and Rehabilitation Norwegian 030204 cardiovascular system & hematology Diet Carbohydrate-Restricted Young Adult 03 medical and health sciences 0302 clinical medicine Environmental health nutrient supplement Humans Medicine Orthopedics and Sports Medicine Muscle Strength Energy deficit Energy deficiency soldiers business.industry Testosterone (patch) 030229 sport sciences Physical Functional Performance Protein intake cortisol language.human_language Military Personnel testosterone Body Composition Diet High-Protein language Female energy deficiency strength Energy Metabolism business Biomarkers |
| Zdroj: | Scandinavian Journal of Medicine & Science in Sports |
| Popis: | In this study, we compare the effects of isocaloric high- (HIGH: 2 g kg−1d−1, n = 19) and low-protein diet (LOW: 1 g kg−1d−1, n = 19) on changes in body composition, muscle strength, and endocrine variables in response to a 10-day military field exercise with energy deficit, followed by 7 days of recovery. Body composition (DXA), one repetition maximum (1RM) bench and leg press, counter-movement jump height (CMJ) and blood variables were assessed before and after the exercise. Performance and blood variables were reassessed after 7days of recov-ery. The 10-day exercise resulted in severe energy deficit in both LOW and HIGH (−4373±1250, −4271±1075kcald−1) and led to decreased body mass (−6.1%, −5.2%), fat mass (−40.5%, −33.4%), 1RM bench press (−9.5%, −9.7%), 1RM leg press (−7.8%, −8.3%), and CMJ (−14.7%, −14.6%), with no differences between groups. No change was seen for fat-free mass. In both groups, the exercise led to a switch toward a catabolic physiological milieu, evident as reduced levels of anabolic hormones (testosterone, IGF-1) and increased levels of cortisol (more pronounced in HIGH, P |
| Databáze: | OpenAIRE |
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