EVALUATION OF MECHANICAL PROPERTIES OF KNEE EXTENSOR AND PATELLAR TENDON DURING SQUATTING BY MUSCLE CONTRACTION SENSOR METHOD

The purpose of this study was to investigate the mechanical properties of muscle-tendon can* during squatting. Fourteen males were participated in this study. The muscle activities of knee extensor during squatting were measured by surface electrompgraphy. The mechanical prop@ of knee extensor and patellar tendon were measured using a muscle contraction (MC) sensor. Muscle activities of the knee exten- during squatting showed a significant correlation to the MC signal. The mechanical properties of the knee extensor and patellar tendon were closely related to the angle of the knee joint MC signals of knee extensor shaved a consistency on each muscle related to patellar tendon. From these results, it is considered, that the method using an MC sensor is effective for evaluating the changes in dynamic tension in muscle-tendon complex during squatting

Activity of knee extensor muscles evaluated by Electromyography and MC sensor method

J-GLOBAL ID : 201401079533207271J-GLOBAL ID : 202001020973622576J-GLOBAL ID : 202101011515064120J-GLOBAL ID : 201901011536506168J-GLOBAL ID : 201801000910828540J-GLOBAL ID : 201701005445265627In this study, the characteristics of the muscle activity on knee extensor muscles and the interaction under the decrease of knee extension torque caused by a continuous knee extension and flexion task were evaluated by electromyography and MC sensor methods (MC). The subjects were 18 healthy males. The continuous task on 30 times knee extension isokinetic contraction was performed by dynamometer (Biodex). And measurement of maximal torque on isometric contraction was pre and post continuous task. At the same time, the muscle activity and deformation amount at the vastus medialis obliquus (VMO) and vastus lateralis (VL) muscles were measured using the surface electromyography and MC sensor method (TMG. BMC). As a result, the continuous knee extension task reduced knee extension torque by 10％. In addition, the muscle activity at the VMO and VL higher in post than pre during the continuous knee extension task. However, the deformation amount was lower in post than in pre during the high-intensity (over the 30％MVC) torque exertion. Moreover, the significant correlations were observed between the relative values of VMO and VL muscle activity and deformation amount pre and post the continuous knee extension task, respectively. Therefore, although the evaluation methods were different, coordinated muscle activity and deformation amount between VMO and VL were confirmed.22K115821520578603916839936application/pdfdepartmental bulletin pape