Effect of trunk stabilization on quadriceps femoris muscle torque.

The purpose of this study was to determine if differences exist in angle-specific torque, torque-velocity relationships, and power-velocity relationships of the quadriceps femoris muscle group when the trunk was and was not stabilized and the starting position was varied. We calculated isokinetic torques from seven adult men while the trunk was and was not stabilized for nine combinations of velocity of movement 0, 30, and 105 degrees/sec) and starting position (40, 60, and 100 degrees of knee flexion). The results suggest that peak angle-specific torques and instantaneous power are greater when the trunk is stabilized, the increase in the trunk-stabilized torque and power was greater at the higher velocity and for the larger ranges of motion, and the testing movement should not begin beyond 30 degrees of the angle of interest.

[1]  L Gransberg,et al.  Determination of dynamic muscle strength in man with acceleration controlled isokinetic movements. , 1983, Acta physiologica Scandinavica.

[2]  H J Hislop,et al.  Isokinetic contraction: a new concept of resistive exercise. , 1967, Archives of physical medicine and rehabilitation.

[3]  A. Thorstensson,et al.  Force-velocity relations and fiber composition in human knee extensor muscles. , 1976, Journal of applied physiology.

[4]  E. Sonnenblick,et al.  Force-velocity relations in mammalian heart muscle. , 1962, The American journal of physiology.

[5]  A. Hill.  The heat of shortening and the dynamic constants of muscle , 1938 .

[6]  D. Wilkie.  The relation between force and velocity in human muscle , 1949, The Journal of physiology.

[7]  V. Edgerton,et al.  Muscle force-velocity and power-velocity relationships under isokinetic loading. , 1978, Medicine and science in sports.

[8]  J M Rothstein,et al.  Effect of damp on isokinetic measurements. , 1983, Physical therapy.

[9]  M WILLIAMS,et al.  Strength variation through the range of joint motion. , 1959, The Physical therapy review.

[10]  J J Knapik,et al.  Comparison of isokinetic measurements with test repetitions. , 1982, Physical therapy.

[11]  J. Hofkosh,et al.  A study of isokinetic exercise. , 1969, Physical therapy.

[12]  V. Edgerton,et al.  Torque-velocity relationships and muscle fiber composition in elite female athletes. , 1979, Journal of applied physiology: respiratory, environmental and exercise physiology.

[13]  J Daniels,et al.  Skeletal muscle enzymes and fiber composition in male and female track athletes. , 1976, Journal of applied physiology.

[14]  E. Coyle,et al.  Leg extension power and muscle fiber composition. , 1979, Medicine and science in sports.