Resistance training and energy balance

Area of Science:

• Exercise Physiology
• Metabolic Studies
• Nutritional Science

Background:

• Daily energy expenditure comprises resting metabolic rate, physical activity, and thermic effect of food.
• Accurate measurement of energy expenditure is crucial for understanding energy balance and weight regulation.
• Resistance training is known to improve muscular strength and endurance.

Purpose of the Study:

• To review the effects of resistance training on various components of energy expenditure.
• To examine how resistance training influences resting metabolic rate, physical activity energy expenditure, and postexercise oxygen consumption.
• To assess the role of resistance training in substrate oxidation and body composition.

Main Methods:

• Review of cross-sectional and exercise intervention studies.
• Analysis of data on resting metabolic rate, physical activity energy expenditure, and postexercise oxygen consumption.
• Examination of substrate oxidation and body composition changes in response to resistance training.

Main Results:

• Resistance training may elevate resting metabolic rate but has minimal impact on overall daily energy expenditure in free-living individuals.
• Intense resistance exercise increases postexercise oxygen consumption and promotes fat oxidation.
• Resistance training primarily influences body weight regulation through increased fat-free mass rather than direct energy expenditure.

Conclusions:

• Resistance training enhances muscular strength and endurance.
• The effects of resistance training on energy balance and body weight are mainly mediated by changes in body composition.
• While resistance exercise contributes to energy expenditure, its role in weight management is largely linked to its impact on fat-free mass accumulation.