Older americans are most noted for their slower pace, loss of balance and deminishing capacity to perform activities of daily living. One of the main issues is Sarcoplasty; the decrease in the number of muscle fibers and select type II fiber atrophy.
Many studies have alluded to the fact that as we get older our muscles become less fatigable as compared to our younger selves. This study Enhanced Fatigue Resistance In Older Adults During Repeated Sets of Intermittent Contractions published in the January 2010 issue of Journal of Strength and Conditioning re-inforces this notion.
The point to be made is most exercise programs designed for older americans typically involve aerobic activities (walking,water aerobics,cycling) and possibly some high repetition/low resistance weight training. All of these activities avoid the key component neccesary to produce strength and power which in turn would aid in ADL's.
Personally, I find that 15-20 minutes of heavy resistance training ( based upon the client's ability) improves their overall health picture, including the ability to climb stairs, rise out of chairs, beds, autos,etc.
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