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Introduction With the onset of 2000 the average North Americans life span has been extended by three years The predictable consequences are detrimental changes in body composition including loss of lean body mass strength flexibility and bone density along with the increase in body weight and body fat Inactivity with aging is the primary factor in these changes because physical activity levels are one of the most important factors affecting body composition from childhood through old age Adams K OShea P OShea K 1999 Our knowledge of the affects of aging on fatigability endurance the ability to maintain force and power output is limited and the few studies that have been performed are inconclusive It is therefore important to assess these areas to give a more detailed account of muscle fatigue endurance and contractibility of aging humans The results of the studies could prove beneficial in helping to prepare older humans to overcome and enhance his or her ability to live an independent lifestyle With advancing age muscle volume is reduced and the aging atrophy referred to as sarcopenia is accompanied by a decrease in muscle strength The reduction in muscle strength seems to be equal for both sexes but women are generally weaker than men throughout all ages Lindstrom B Lexell J Gerdle B Downham D 1997 Since gait pattern also changes with age especially in women older individuals have an increased risk of falls and hip fractures However both arm and leg muscles in aging men and women can adapt successfully to increased use in particular following periods of heavy resistance training Physical exercise is therefore considered beneficial in reducing the risk of muscle atrophy among older humans Linstrom et al 1997 It has been suggested that once strength declines below certain threshold levels required for activities of daily living significant functional impairment begins to happen Along with a change in strength is a change in muscle contractile properties the
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