Growth, Development and Physical Fitness
This section covers growth, development and physical fitness. The exam tests the difference between quantitative growth and qualitative development, the stages and factors affecting them, and the ability to classify fitness components correctly.
Growth versus development
Growth is a quantitative increase in size or mass, such as height and weight. Development is a qualitative change in function and maturity, such as motor coordination or social maturity. Stages include infancy, early childhood, later childhood, adolescence and adulthood. Adolescence includes puberty and a growth spurt, but its timing varies widely.
Factors affecting growth and development
Heredity sets a range; nutrition supplies raw materials; hormones such as growth hormone, thyroid hormones and sex hormones regulate change; exercise, sleep, climate, disease and socioeconomic conditions modify outcomes.
Fitness components
Health-related components are cardiorespiratory endurance, muscular strength, muscular endurance, flexibility and body composition. Skill-related components are speed, agility, balance, coordination, power and reaction time.
Worked example
A 14-year-old is taller than classmates but cannot touch toes and tires quickly in a 12-minute run. Is the student physically fit? Reasoning: height is a growth measure, not a fitness measure. Poor flexibility and low endurance show weaknesses in health-related components. The correct conclusion is that growth status does not prove fitness; training should target flexibility and cardiorespiratory endurance while respecting the adolescent growth period.
Traps
Do not use growth and development as synonyms. Do not equate height with fitness. Do not put speed or agility under health-related fitness. Do not assume all adolescents mature at the same age. Do not ignore nutrition and sleep when explaining growth.