Sit-to-stand Test to Evaluate Knee Extensor Muscle Size and Strength in the Elderly : A Novel Approach

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The present study examined whether a sit-to-stand score can be related to the force-generating capacity of knee extensor muscles. Fifty-seven subjects (28 men, 63.0±7.8 yrs, and 29 women, 64.2±7.5 yrs, means±SDs) performed a 10-repeated sit-to-stand test as fast as possible, on a steel molded chair. The time taken (T_<sit-stand>) was measured with a manual stopwatch. The leg length (L), defined as the distance from the great trochanter of the femur to the malleolus lateralis, was measured using a tape. A power index of the test (P_<sit-stand>) was calculated by using the following equation: P_<sit-stand>=(L-0.4)×body mass×g×10/T_<sit-stand>. The cross-sectional area of the quadriceps femoris muscle (CSA_<KE>) and the maximal voluntary isometric knee extension force (F_<KE>) were measured using MRI and a static myometer, respectively. There was no significant correlation between T_<sit-stand> and each of CSA_<KE> and F_<KE>. On the other hand, the P_<sit-stand> was highly correlated with CSA_<KE> and F_<KE>, even after the influence of body mass and L was statistically eliminated. These results indicate that P_<sit-stand>, derived from three variables of body mass, leg length, and time taken for a sit-to-stand test, can be a useful index to assess the force-generating capacity of the knee extensor muscles of elderly individuals.
日本生理人類学会の論文