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Unformatted text preview: Benefits and Risks of Exercise
Lecture #2 August 30, 2007 Benefits of Exercise ⇓ Risk of:
– – – – – – – ⇑ and/or prevents decline in:
Physical Work Capacity Independence Longevity Psychological wellbeing Heart Disease Type 2 Diabetes Bone Fracture/Osteoporosis See extended list on page 16 Source of Data Randomized Clinical Trials Nonrandomized Clinical Trials Observational Studies Expert Judgment Who’s the control group?? Active vs. Inactive?? Theory of Evolution by Frank Booth Medicine & Science in Sports and Exercise. 38(3): 405406, March 2006 Aerobics Center Longitudinal Study 10,000 men, 3,000 women 8 years Allcause mortality in relation to initial cardiorespiratory fitness level Men w/ lowest level of fitness 3.44X more likely to die Women w/ lowest level of fitness 4.65X more likely to die Aerobics Center Longitudinal Study DoseResponse Relationship ??
Health Benefits Disease Risk Physical Activity Evidence for Dose Response Allcause mortality Cardiovascular and coronary heart disease Overweight and obesity Type 2 diabetes* Colon cancer Quality of life and independent living * doseresponse for primary prevention, not blood glucose control in diabetics Insufficient Data for Dose Response Blood lipids and lipoproteins Coagulation and hemostatic factors Low back pain, osteoarthritis, and osteoporosis Blood pressure and Hypertension* Depression and anxiety* * No evidence exists for doseresponse relationship Threshold for Health Benefits
Health Benefits Disease Risk Physical Activity Health vs. Fitness Benefits Physical Activity Recommendations – Mission of American College of Sports Medicine:
Promote ⇑ physical activity and fitness 1. ⇑ professional and public awareness 1. amount and intensity required – – Surgeon General’s Report sig. health benefits obtained w/ moderate physical activity on most days of the week additional benefits gained w/ more physical activity Physical Activity Recommendations – Institute of Medicine of the National Academy of sciences 2005 Dietary Guidelines ACSM and AHA
60 min. moderate intensity everyday 60 min. moderate intensity everyday 30 min. moderate intensity 5 days/week 20 min. vigorous intensity 3 days/week Muscular strength/endurance 2 days/week More is BETTER – – – – – Negative Effects of Exercise Overtraining = General Adaptation Syndrome
– Exercise is a stress – Body will adapt if consistent ⇑ risk of injury ⇓ immunity – Rare for general population ...
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- Spring '07