Scientific Fitness and Nutritional Supplementation Guidelines to Support Healthy Growth and Development in Adolescent Males

Fitness During Puberty

Physical exercise accelerates the formation of new bone tissue in the cartilage layer of long bones, promoting faster bone growth and thus increasing height. During physical activity, the body's blood supply significantly increases. Increased blood flow means muscles and bones receive more nutrients, resulting in thicker muscle fibers, more developed muscles, and improved muscle elasticity and extensibility. Physical exercise also enhances the extensibility of muscles and ligaments around joints, increasing joint range of motion and flexibility.

Physical exercise strengthens heart function, developing the heart muscle, resulting in a slower but stronger heartbeat and increased blood flow, thus providing the body with more sufficient and timely oxygen and nutrients, transporting metabolic waste products, and meeting the body's needs. Exercise improves respiratory function, developing respiratory muscles, expanding the chest, and increasing lung capacity. Participation in physical exercise also improves blood circulation, increasing the number of white blood cells, red blood cells, and hemoglobin in the blood, while lowering blood lipid and cholesterol levels.

 

Regular physical exercise can also enhance appetite, improve gastrointestinal digestion and absorption, and improve kidney excretion. Additionally, it improves body temperature regulation and sleep.

Physical exercise makes the nervous system more coordinated, reactions more agile, the mind more flexible, problem-solving more quick, and allows for longer periods of sustained work, increasing endurance.

There are also some taboos regarding exercise during adolescence:

① Avoid blindly pursuing high exercise volume. Because the body is not yet fully developed during puberty, suddenly engaging in high-intensity, heavy-load, and highly competitive sports can cause sports injuries.

② Avoid lack of targeted exercise. The first few years of puberty are a period of rapid height growth, suitable for stretching exercises such as ball games, swimming, and running. The years following this growth spurt are a period of rapid muscle growth, suitable for strength training such as gymnastics and weightlifting.

③ Avoid a single type of exercise. Various sports have advantages and disadvantages for adolescent development; a balanced approach with multiple skills is recommended. Football is effective for training the lower limbs and heart, while weight training is effective for training the upper limbs and trunk.

④ Avoid exercising in a way that violates your "biological clock." The best times for exercise and improving learning efficiency are after 6:00 AM, 9:00 AM, and 4:00 PM.

⑤ Avoid exercising in unsuitable environments. Exercising on hard surfaces like concrete can easily lead to ankle sprains; vigorous exercise in foggy weather can cause respiratory illnesses due to inhaling harmful chemicals; exercising in dusty, polluted environments can hinder gas exchange in the alveoli, resulting in insufficient oxygen supply.

⑥ Avoid sudden starts and stops. Not warming up before exercise can easily cause muscle and joint sprains or strains, and abdominal pain. Not cooling down after vigorous exercise can cause dizziness, vomiting, or even fainting due to cerebral ischemia. In addition, strenuous exercise half an hour before or after meals can damage the stomach and intestines; being exposed to cold wind or showering with cold water immediately after exercise can easily lead to colds and rheumatoid arthritis.

Adolescent Nutrition

After entering adolescence, there is more mental and physical activity, and the body is in a stage of growth and development, with vigorous metabolism and increased energy consumption. Therefore, the body needs to constantly absorb various nutrients from food. If nutrition is insufficient, it will not only affect the body's growth and development, but also make it easier to contract infectious diseases such as hepatitis, tuberculosis, and influenza.

Adolescent nutrition should focus on the following four issues:

(1) Sufficient energy is necessary. The body's basal metabolism, functional activities, development, and maintenance of body temperature all require sufficient energy. If there is insufficient energy supply, fatigue, weight loss, and decreased resistance will easily occur, which will inevitably affect or hinder the normal growth and development of adolescents. (1) Ensure a daily intake of approximately 12,600 kJ (3,000 kcal).

(2) Ensure sufficient high-quality protein. Protein is the material basis of life. Insufficient intake can lead to stunted growth and development, emaciation, underweight, anemia, slow wound healing, susceptibility to diseases, poor memory, and lethargy. Severe deficiency can also cause intellectual impairment and nutritional edema. Therefore, one should eat more protein-rich foods such as lean meat, fish, eggs, milk and dairy products; it is essential to ensure a daily protein intake of 80-90 grams, ideally with 1/2 or 1/3 of the protein coming from animal foods and legumes.

(3) Ensure adequate intake of various inorganic salts. Inorganic salts include calcium, phosphorus, iron, zinc, iodine, etc. They are essential substances for maintaining normal physiological functions. The daily requirement is approximately 800 mg of calcium, 400 mg of phosphorus, 300 mg of magnesium, 15 mg of iron, and 140 micrograms of iodine. Calcium and phosphorus are the main components of teeth and bones; deficiency can affect tooth and bone development. Iron is an essential raw material for hematopoiesis; insufficient supply can cause iron-deficiency anemia. Zinc helps cell division, especially beneficial for brain and nerve cells; zinc deficiency can affect growth and development, and can also cause loss of appetite, abnormal taste and smell, and decreased intelligence. Iodine is the main component for synthesizing thyroid hormones; long-term iodine deficiency can lead to goiter, affecting physical and intellectual development. Therefore, it is important to consume plenty of milk, eggs, animal liver, green vegetables, and seafood.

(4) Pay attention to vitamin intake. Vitamins are essential trace organic substances for maintaining life, growth, and metabolism. They mainly include vitamins A, B vitamins, vitamin C, and vitamin D, among which vitamins B₁, B₂, D, and C have a greater impact on the body. Vitamin A promotes growth and development, protects vision, and prevents night blindness. B vitamins participate in enzyme reactions and are components of many coenzymes, closely related to protein, carbohydrate, and fat metabolism. Vitamin B₁ deficiency can lead to loss of appetite, constipation, irritability, and difficulty concentrating. Vitamin C has antiviral effects, enhances the body's immunity, and helps prevent colds. Vitamin D promotes calcium absorption. These vitamins are abundant in leafy green vegetables, carrots, tomatoes, animal liver, eggs, dates, citrus fruits, and bones. Therefore, eating plenty of fresh vegetables and fruits can ensure adequate intake.

Diseases.

Nutritional considerations during adolescence should focus on the following four issues:

(1) Sufficient energy intake. The body's basal metabolism, functional activities, development, and temperature maintenance all require sufficient energy. Insufficient energy supply can easily lead to fatigue, weight loss, and decreased immunity, inevitably affecting or hindering normal growth and development in adolescents. Daily dietary energy intake should be around 12,600 kJ (3,000 kcal).

(2) Sufficient high-quality protein. Protein is the material basis of life. Insufficient intake can cause stunted growth and development, weight loss, underweight, anemia, slow wound healing, susceptibility to diseases, poor memory, and lethargy. Severe deficiency can also cause intellectual impairment and nutritional edema. Therefore, one should eat more protein-rich foods, such as lean meat, fish, eggs, milk and dairy products; it is essential to ensure a daily intake of 80-90 grams of protein, and ideally, 1/2 or 1/3 of the protein should come from animal-based foods and legumes.