Training status impacts metabolic response to a high-protein weight loss diet in recreationally resistance-trained females.
International Journal of Exercise Science 16(2): 377-392, 2023. This study investigated the effects of a novel high-protein diet template on postprandial metabolism and body composition (e.g., waist and hip circumference, body fat (%), fat mass, fat-free mass) in recreationally resistance-trained females. Fifteen females adhered to an eight-week high-protein dietary intervention (~1.5-1.6 g·kg-1·day-1) administered via template format. Pre- and post-intervention visits included anthropometrics, measurement of body composition, and an acute high-fat meal challenge. The high-fat meal challenge (61% fat) consisted of fasting postprandial blood glucose, resting metabolic rate (RMR), fat and carbohydrate oxidation assessed at 60-, 120-, and 180-minutes. Participants were split into high (HTF; 5-6 days ·week-1 of resistance training; n = 8) and low-training frequency (LTF; 2-3 days ·week-1 of resistance training; n = 7) groups. All metabolism data were assessed as absolute (kcal or g) and relative (kcal or g·kg·FFM-1·minutes-1) to fat-free mass. Post-intervention, there was a significant reduction in HTF waist circumference (p = 0.044), LTF body fat % (p = 0.012), and LTF fat mass (p = 0.014). Post-intervention, HTF females had significantly lower absolute RMR area under the curve (AUC) than LTF females (p = 0.036). LTF females had higher absolute fat oxidation AUC compared to HTF females’ pre-intervention (p = 0.048) but a significant decrease in absolute (p = 0.050) and relative (p = 0.050) fat oxidation AUC post-intervention. LTF females had a significant increase in absolute (p = 0.032) and relative (p = 0.029) carbohydrate oxidation AUC pre- to post-intervention (p = 0.032). For blood glucose, no significant differences between groups were detected (p > 0.05). These findings suggest that a novel high-protein diet template elicits a metabolic shift favoring carbohydrate oxidation in females engaging in low-frequency resistance training but did not alter fat and carbohydrate metabolism in females engaging in HTF resistance training.
Olenick, Alyssa A.; Pearson, Regis C.; and Jenkins, Nathan T.
"Training status impacts metabolic response to a high-protein weight loss diet in recreationally resistance-trained females.,"
International Journal of Exercise Science: Vol. 16
2, Pages 377 - 392.
Available at: https://digitalcommons.wku.edu/ijes/vol16/iss2/7