TY - JOUR
T1 - Sit-to-stand test to evaluate knee extensor muscle size and strength in the elderly
T2 - A novel approach
AU - Takai, Yohei
AU - Ohta, Megumi
AU - Akagi, Ryota
AU - Kanehisa, Hiroaki
AU - Kawakami, Yasuo
AU - Fukunaga, Tetsuo
PY - 2009
Y1 - 2009
N2 - 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 (Tsit-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 (Psit-stand) was calculated by using the following equation: Psit-stand=(L-0.4)×body mass×g×10/Tsit-stand. The cross-sectional area of the quadriceps femoris muscle (CSAKE) and the maximal voluntary isometric knee extension force (FKE) were measured using MRI and a static myometer, respectively. There was no significant correlation between Tsit-stand and each of CSAKE and FKE. On the other hand, the Psit-stand was highly correlated with CSAKE and FKE, even after the influence of body mass and L was statistically eliminated. These results indicate that Psit-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.
AB - 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 (Tsit-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 (Psit-stand) was calculated by using the following equation: Psit-stand=(L-0.4)×body mass×g×10/Tsit-stand. The cross-sectional area of the quadriceps femoris muscle (CSAKE) and the maximal voluntary isometric knee extension force (FKE) were measured using MRI and a static myometer, respectively. There was no significant correlation between Tsit-stand and each of CSAKE and FKE. On the other hand, the Psit-stand was highly correlated with CSAKE and FKE, even after the influence of body mass and L was statistically eliminated. These results indicate that Psit-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.
KW - Body size
KW - Force-generating capacity
KW - Knee extensor muscles
KW - Ten-repeated sit-to-stand test
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U2 - 10.2114/jpa2.28.123
DO - 10.2114/jpa2.28.123
M3 - Article
C2 - 19483373
AN - SCOPUS:69249206899
VL - 28
SP - 123
EP - 128
JO - Journal of Physiological Anthropology
JF - Journal of Physiological Anthropology
SN - 1880-6791
IS - 3
ER -