中年・高齢期女性の椅子立ち上がり動作時の地面反力と年齢との関連

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The purpose of this study was to investigate the age-related changes in vertical ground reaction force which reflected characteristics of force exertion and movement time during sit-to-stand (STS) movement. Hundred one healthy middle-aged and older women (age range 46 to 87 years) were recruited as subjects. Each subject was asked to stand up quickly from a sitting position. Three parameters were measured: 1) peak reaction force per body weight (F/w, kgf・kg^<-1>), which reflected the maximal downward push to rise the body upwards, 2) maximal rate of force development per body weight (RFD_<max>/w, kgf/s・kg^<-1>), which estimated the capacity for rapid muscle force production, 3) a movement time (T, ms), which evaluated quickness of movement. Five-time STS test was also measured to assess the muscle power of lower extremity. Significant differences were found in these 3 parameters and five-time STS test between middle-aged women (n=51, age<65) and older women (n=50, age≧65). The most notable difference was observed in F/w (p<0.001, effect size=1.46), compared with the smaller difference in T (p=0.002, effect size=0.65). The strongest correlation with age was found in F/w (r=-0.585, p<0.001). Two-piece linear regression lines were displayed with age as an independent variable, which indicated that the breaking-points appeared at around 65 years old in F/w, RFD_<max>/w and five-time STS test. Meanwhile, it appeared at 74 years old in T. These findings suggested that characteristics of force exertion during STS movement were related closely to age, but changes of these characteristics didn't necessarily link the prolongation of the movement time.
2011-02-28

中年・高齢期女性の椅子立ち上がり動作時の地面反力と年齢との関連

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