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Posted May 07 2009 9:22pm
Physical activity is associated with risks as well as benefits. Musculoskeletal overuse injuries of the lower extremity are the most common negative consequences of physical activity. Three factors are strongly associated with a risk of musculoskeletal injury:
Previous injuries,
Increased duration of activity,
Exercise intensity.
The risk of injury is considerably higher with vigorous activity than with moderate activity. The clinician can reduce patients' risk of injury by making them aware of these associations and by advocating moderate physical activity and gradual increases in duration of activity.
Major cardiac events, although rare, have been associated with vigorous physical activity. The risk of cardiac arrest is transiently elevated during exercise both for those who are regularly active and to a greater extent for individuals who are irregularly active. However, the overall risk of cardiac arrest is reduced in men who are regularly active. The incidence of sudden death associated with jogging has been estimated at 1 per 360,000 hours of jogging. The majority of these deaths are due to underlying CHD. Physical activity may also exacerbate medical conditions such as asthma, and irregular exercise may make insulin dosing more challenging in diabetic patients. Nevertheless, most individuals with underlying disease or disability may still safely exercise if appropriate precautions are taken
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