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Acute carbohydrate consumption does not influence resistance exercise performance during energy restriction
R A Dalton1, J W Rankin, D Sebolt
1Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg 24061-0430, USA.
International Journal of Sport Nutrition
|February 8, 2000
Summary
Consuming carbohydrates before resistance exercise in a calorie deficit did not improve workout performance or reduce muscle damage in trained males. This study investigated the impact of acute carbohydrate intake on exercise outcomes.
Area of Science:
- Exercise Physiology
- Sports Nutrition
- Metabolic Studies
Background:
- Understanding nutrient timing is crucial for optimizing athletic performance.
- Resistance-trained individuals often manipulate diet, potentially entering negative energy balance.
- The role of acute carbohydrate intake in this state requires further elucidation.
Purpose of the Study:
- To determine the effect of acute carbohydrate consumption on performance and metabolism in resistance-trained males.
- To assess if carbohydrate intake impacts muscle damage markers during resistance exercise in a negative energy balance state.
Main Methods:
- Twenty-two resistance-trained males were divided into carbohydrate, placebo, and control groups.
- Subjects underwent standardized resistance training for one week prior to and during testing.
- Performance was assessed via leg extension and bench press to failure at 80% of 10 repetition maximum, with beverage consumption 30 minutes before the final test (T3).
Main Results:
- No significant difference in the number of repetitions completed during the leg extension test was observed across groups.
- Acute carbohydrate intake prior to resistance exercise in a negative energy balance state did not enhance performance.
- Evidence of muscle damage was not affected by carbohydrate consumption.
Conclusions:
- Acute carbohydrate consumption does not appear to benefit performance or mitigate muscle damage in resistance-trained males undergoing exercise in a negative energy balance.
- Further research may explore different macronutrients or longer-term dietary strategies.