Physiological effects of exercise on weight loss: influence on metabolic rate, appetite, and body composition

Other weight loss methods. Exercise for weight loss. Obesity is fundamentally a result of calorie intake exceeding calorie expenditure, and insufficient exercise leading to inadequate calorie expenditure is a major contributing factor. Long-term adherence to exercise not only increases energy expenditure and improves glucose and lipid metabolism, effectively reducing weight, but also improves cardiopulmonary function and reduces the incidence of cardiovascular and cerebrovascular diseases. Therefore, as an important component of obesity treatment, exercise therapy is receiving increasing attention.

The basic principle of exercise for weight loss is to increase energy expenditure, maintain a negative energy balance between energy intake and expenditure, and gradually eliminate excess body fat. The effects of exercise for weight loss include: 1. The effect of exercise on metabolic rate. Although opinions differ on the effect of exercise on basal metabolic rate-some studies suggest no significant effect, while others believe exercise can lower the metabolic rate-one thing is certain: energy expenditure increases during and for a considerable period after exercise.

This is mainly because lactic acid and fatty acids are oxidized in the body after exercise, and the recovery of glycogen stores depleted during exercise also requires energy. In addition, endocrine changes and increased body temperature caused by exercise can lead to a higher resting metabolic rate after exercise, lasting at least 1-2 hours, or even longer. This increased energy expenditure disrupts the ratio between food intake and expenditure, resulting in weight loss. 2. The effect of exercise on appetite. Different levels and types of exercise have different effects on appetite.

Excessive, high-intensity exercise can reduce appetite, while moderate, long-term, and regular exercise can increase appetite. Although moderate, long-term, and regular exercise can increase food intake, the increase in calorie expenditure is even greater. Therefore, the storage of body fat will not increase, and weight can remain relatively constant or decrease to varying degrees. If combined with appropriate dietary control, weight loss will be more significant. 3. The impact of exercise on body composition. The impact of exercise on changes in body composition mainly depends on the intensity, frequency, and duration of exercise, as well as the ratio of calorie expenditure to intake.

In general, only slight changes occur in body composition. (1) Effects on muscles: Small amounts of short-duration exercise have little effect on muscle proportion, while moderate amounts of long-term regular exercise increase muscle proportion. (2) Effects on fat metabolism: Exercise, especially long-duration aerobic exercise, such as brisk walking, jogging, cycling and aerobics with music, can increase the secretion of catecholamines and adrenocortical hormones and inhibit insulin secretion.

Increased activity of enzymes such as triglycerides, cytochrome C oxidase, and citrate synthase promotes the mobilization of free fatty acids from stored adipose tissue into the bloodstream, where they then enter muscle tissue for oxidative breakdown. This leads to a decrease in body fat weight and percentage, resulting in a lower BMI. Furthermore, exercise can reduce the fat content of fat cells and shrink enlarged fat cells. During short periods of high-intensity exercise, fat is generally not mobilized, released, or oxidized. These are the advantages of exercise for weight loss.

Compared to other weight loss methods such as diet control and medication, exercise has many advantages, which can be summarized as follows: 1. Improves cardiopulmonary function, reducing the risk of cardiovascular disease. 2. Prevents nutritional deficiencies because it does not require strict dietary control. 3. Reduces body fat and its percentage, while increasing muscle mass, resulting in more proportionate body proportions while reducing weight. 4. Significantly improves physical strength, fitness, and mental state. 5. No adverse reactions.