英語の翻訳をお願いします…
Loss of the ability to walk safely is often a primary reason for nursing home placement . the most common causes of such gait and balance disturbances are organic brain syndromes and musculoskeletal disorders . but even in the absence of specific diseases, disturbances in gait and balances may produce disability in up to 13%of older individuals . furthermore, nonspecific changes in gait and balance affect nearly all older individuals and are attributed to the normal aging process .reported changes have included increased postural sway accompanied by decreases in ambulatory velocity , step and stride length , step cadence and swingtime ratio . Impairments in gait and balance lead ton such undesirable consequences as heat of falling, galls with fractures , loss of confidence , loss of independence and lowered quality of life. Within long term care institutions , between 40 and 50% of residents will fall during any given year . musculoskeletal weakness , poor balance and number of prescribed medications have been associated with falling among institutionalized subjects . additionally, isokinetic testing of institutionalized fallers has demonstrated both knee and ankle weakness compared with controls . postural sway has also been found to be higher among those who fall . gait comparison of subjects hospitalized after falls versus controls has demonstrated slow walking speed , short step length , narrow stride width , a wide range of stepping frequency , large variability of step length and increasing variability with increasing step frequency .
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