Abstract
Background: Protein availability around aerobic exercise might benefit aerobic capacity and body composition in normal weight adults. However, it is unknown if individuals with overweight/obesity elicit similar adaptations or improve other cardiometabolic/health-related markers in response to different types of protein. Thus, our aim was to study the effect of supplementation of two different protein drinks in conjunction with exercise on aerobic capacity, body composition and blood health markers in untrained subjects with overweight or obesity.Methods: The present study measured training adaptation and health parameters over a 6 week period in untrained men with overweight/obesity (n = 28; BMI 30.4 ± 2.2 kg/m2) ingesting either plant- (Oat/Potato; n = 8) or animal-based (Milk; n = 10) protein-carbohydrate drinks (10 g of protein/serving), or a control carbohydrate drink (n = 10) acutely before and after each training session (average three sessions/week @ 70% HRmax). Pre-post intervention , muscle biopsies and blood samples were collected, body composition measured (DXA) and two different exercise tests performed. Body weight was controlled with participants remaining weight stable throughout the intervention.Results: For the groups combined, the training intervention significantly increased (8%; P < 0.001), performance in a time-to-exhaustion trial (~ 100%; P < 0.001), mitochondrial protein content and enzyme activity (~20–200%). Lean body mass increased (1%; P < 0.01) and fat mass decreased (3%; P < 0.01). No significant effects on fasting blood glucose, insulin, lipids or markers of immune function were observed. There were no significant interactions between drink conditions for training adaptation or blood measurements. For body composition, the Oat/Potato and carbohydrate group decreased leg fat mass significantly more than the Milk group (interaction P < 0.05).Conclusions: Aerobic capacity and body composition were improved and a number of mitochondrial, glycolytic and oxidative skeletal muscle proteins and enzyme activities were upregulated by a 6 week training intervention. However, none of the parameters for endurance training adaptation were influenced by protein supplementation before and after each training session.
Highlights
Overweight (BMI ≥ 25 kg/m2) and obesity (BMI ≥ 30 kg/m2) are defined as excess adiposity that presents a risk to health [1]
While markers of mitochondrial adaptation such as citrate synthase (CS), succinate dehydrogenase (SDH) activity and PGC-1α protein content has been shown to be increased by the training intervention per se, this increment appears to be independent of post-exercise protein or carbohydrate only intake [12, 13]
Considering that it currently is unknown if chronic protein supplementation in conjunction with aerobic exercise results in similar responses in overweight/obese individuals as in normal weight individuals, and that improvements in V O2max and fat free mass (FFM) within the former population can have positive effects extending beyond performance enhancement, warrants further research
Summary
Overweight (BMI ≥ 25 kg/m2) and obesity (BMI ≥ 30 kg/m2) are defined as excess adiposity that presents a risk to health [1]. High BMI has been related to an increment in post-exercise muscle damage/CKlevels [19], and obesity has both been shown to interfere with physiological changes occurring in the mitochondria in response to acute elevation in the plasma amino acids [20], and to be associated with a blunted myofibrillar protein synthetic response to dietary protein ingestion following resistance exercise [21] Considering that it currently is unknown if chronic protein supplementation in conjunction with aerobic exercise results in similar responses in overweight/obese individuals as in normal weight individuals, and that improvements in V O2max and FFM within the former population can have positive effects extending beyond performance enhancement (i.e., health benefits), warrants further research. Our aim was to study the effect of supplementation of two different protein drinks in conjunction with exercise on aerobic capacity, body composition and blood health markers in untrained subjects with overweight or obesity
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