KIN+3502+lecture+eleven

KIN+3502+lecture+eleven - KIN 3502 • No lab this week •...

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Unformatted text preview: KIN 3502 • No lab this week • Lab 8 due next week Chapter 14 Adult and Older Adult Fitness Aging and Fitness • U.S. population is aging – Median age (1990) = 32.9 years – Median age (2000) = 35.3 years – Percentage of Adults over 65 • 8% in 1950 • 12.5 % in 2000 • Proportion is increasing • Has implications for the economy and health care Aging and Fitness • 1990-2000 saw increase in older adults (65+ years) from 32 million to 35 million • Baby boomers will start retiring around 2011: greater increase in older adults • Need to promote physical activity in order to improve quality of life and independence of older adults Investigating Aging Effect on Fitness • Cross-sectional methods – One-time measure across different age groups • YMCA database of 20,000 adults 18-65+ years • Y’s Way to Physical Fitness test norms available across adult age groups • Can use regression techniques to estimate age effect on fitness Cross sectional Methods • Advantages – Data are more readily available – Sample including a wide age range only needs to be tested once • Limitations – Sample is not representative of population • Older subjects are the ones who are healthier (i. e. they have survived) – Can define a trend, but not the true effect of aging Investigating Aging Effect on Fitness • Longitudinal designs – Need at least two measures, separated by several years • Rate of decline = (T 1- T 2 )/(Age 2- Age 1 ) – T 1 = fitness score at Age 1 , T 2 = fitness score at Age 2 • More accurate estimate of decline over time, but more expensive and time- consuming than cross-sectional data collection Aerobic Fitness • Declines with age during adulthood • Decline in maximal heart rate a contributing factor • Other factors: – decline in physical activity – reduction in muscle mass – increase in fat mass • Both cross-sectional and longitudinal data document the decline Aerobic Fitness • NASA Studies (cross-sectional) – About 50% of decline associated with life style • Percent body fat • Exercise habits • Importance of aerobic fitness – Needed to function independently – Essential to quality of life • Levels of function based on VO 2 max – Severe impairment = 15 ml . kg-1 . m-1 – Moderate impairment = 20 ml . kg-1 . m-1 – Most common aerobic measures on functional fitness tests (for older adults) use walking Body Composition • Body weight and body fatness increase during adulthood • BMI increases with age, levels off – Around age 45 in men – Around age 55 in women • Percent fat levels also increase – Levels off during the 50s • Increase in percent fat is due to combination of fat mass increase and fat-free mass decrease (especially muscle mass) Body Composition • Lifestyle is a major determinant • Longitudinal Study at Baylor College of Medicine – Demonstrated the importance of exercise on weight control • Aging is responsible for some change in body composition, but lifestyle plays a major role!!!! Strength...
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KIN+3502+lecture+eleven - KIN 3502 • No lab this week •...

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