fall 2007-lecture 2

fall 2007-lecture 2 - Benefits and Risks of Exercise...

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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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