Health Wisdom in Scientific Fitness and Exercise Intensity

Exercise should be performed in a suitable temperature.

Temperature changes have the most direct and obvious impact on exercise. The human body has a sophisticated thermoregulation mechanism. Under different temperature conditions, the body's metabolic rate and heat dissipation methods will change accordingly to maintain a constant body temperature. However, this thermoregulation ability is limited.

When the temperature is too high (above 35℃), there is a risk of heatstroke during exercise. The elderly and children are not suitable for physical activity at this time. For athletes and strong young men, appropriate exercise is possible, but attention must be paid to replenishing water and vitamins, maintaining a balanced diet, and gradually increasing the amount of exercise to reach the predetermined requirements. The exercise time should not be too long. If you feel feverish, dizzy, have a headache, dry mouth, or other discomfort, stop exercising immediately.

At the same time, the impact of low temperatures on exercise should not be ignored. Low temperatures mainly cause localized frostbite and hypothermia. Prolonged exercise in cold environments (such as long-distance running) can lead to excessive heat loss, causing symptoms like dizziness, decreased coordination, and unsteady gait. In such cases, it is crucial not to lie down and rest, as this will further lower body temperature, potentially leading to coma or even death. The correct approach is to avoid exercising on an empty stomach, wear appropriate clothing, and control the duration of exercise to maintain body temperature and normal bodily functions, ensuring that physical exercise truly achieves its health-promoting goals.

Because the human body has limited adaptability to both high and low temperatures, medical professionals have proposed the concepts of "heat tolerance training" and "cold tolerance training." This involves heat tolerance training in late spring and early summer, and cold tolerance training in autumn and winter. One can also adopt some of the ancient practices of "dressing warmly in spring and lightly in autumn" (such as adding or removing clothing). This allows the body's physiological functions to actively adapt to temperature changes, gradually preparing for upcoming high and low temperatures.

Precautions for Exercise

Exercise is divided into two types: competitive and fitness. The latter refers to activities that promote physical health. Only by scientifically choosing exercise methods and approaches can we maximize our physical fitness and disease resistance.

For healthy men, there are virtually no restrictions on the type of exercise. Walking, running, cycling, swimming, mountain climbing, and various ball sports are all suitable. Currently, walking is a preferred exercise method among international experts, as it has the advantages of low risk of injury and low physical danger.

After choosing a suitable exercise method, it is crucial for men to determine the appropriate exercise intensity. For the average man, heart rate can be used to measure exercise intensity. A simple formula is: Maximum heart rate = 220 - age. Generally, reaching 30%–59% of maximum heart rate is considered low intensity, 60%–79% is moderate intensity, and 80%–89% is high intensity. Older men should primarily engage in high-intensity exercise, middle-aged men should primarily engage in moderate-intensity exercise, and teenagers can engage in either moderate or high-intensity exercise.

Furthermore, men with medical conditions should choose exercises that are slow-paced and require less physical exertion. For those without a prior fitness routine, the amount of exercise should gradually increase as physical condition and function improve. Suitable aerobic exercises include moderate-speed walking, Tai Chi, and aerobics.

Men should pay attention to the following points when exercising:

① Avoid exercising in crowded places.

② Avoid exercise when feeling weak, fatigued, or during an illness.

③ Maintain a consistent exercise routine, exercising at least three times a week with intervals not exceeding one week.

④ Appropriately control the amount and intensity of exercise; avoid excessive high-intensity, long-duration endurance training.

⑤ Avoid overly strenuous, prolonged, or breath-holding exercises.