Title
Effects of a 15-day low carbohydrate, highfat diet in resistance-Trained men
Document Type
Article
Publication Date
1-1-2018
Abstract
© 2017 National Strength and Conditioning Association. Waldman, HS, Krings, BM, Basham, SA, Smith, JW, Fountain, BJ, and McAllister, MJ. Effects of a 15-day low carbohydrate, high-fat diet in resistance-Trained men. J Strength Cond Res 32(11): 3103-3111, 2018-This study examined the effects of a 15-day isocaloric low carbohydrate (,25% E), high-fat (.50% E) (LCHF) diet on physiological and metabolic alterations in resistance-Trained (RT) men. College-Aged RT men (n = 11) completed 4 V- O2max tests using treadmill every 5 days during the 15-day trial. Blood was drawn intravenously pre-exercise across each experimental trial for insulin, cortisol, and glucose. Pulmonary data were collected and substrate oxidation (OXI) was calculated during exercise. Body mass decreased (p , 0.04) with no further changes in anthropometric measures. Time to exhaustion was not affected across each day. Insulin dropped below baseline values (p , 0.0005). Cortisol increased from baseline to day 5 (p , 0.004) but returned back to near baseline at day 10, whereas glucose remained within normal range throughout the duration of the study. Carbohydrate (CHO) OXI dropped (p , 0.001) from baseline to day 5, and fat OXI increased from baseline to day 5 (p , 0.0001). Heart rate decreased from baseline to day 5 (p , 0.001) and again from day 10 to 15 (p , 0.02). Oxygen uptake (V- O2) decreased from day 5 to 10 (p , 0.0001). A nonketo LCHF diet appears to favor RT men by altering metabolic markers without decrements in aerobic performance and be a potential diet intervention used by coaches. However, the reported cardiorespiratory responses should be interpreted reasonably because of the possibility the subjects running economy improved over experimental trials.
DOI
10.1519/JSC.0000000000002282
Publication Title
Journal of Strength and Conditioning Research
First Page
3103
Last Page
3111
Recommended Citation
Waldman, H., Krings, B., Basham, S., Mith, J., Fountain, B., & McAllister, M.
(2018). Effects of a 15-day low carbohydrate, highfat diet in resistance-Trained men. Journal of Strength and Conditioning Research, 32 (11), 3103-3111.