Peer-Reviewed Journal Details
Mandatory Fields
Harrison, AJ; Keane, SP; Coglan, J
2004
August
Journal Of Strength And Conditioning Research
Force-velocity relationship and stretch-shortening cycle function in sprint and endurance athletes
Published
()
Optional Fields
biomechanics isokinetics running jumping leg stiffness Hill equation KNEE EXTENSOR MUSCLES LEG STIFFNESS ELASTIC PROPERTIES FIBER COMPOSITION TENDON STRUCTURES PERFORMANCE SPEED BIOMECHANICS MECHANICS FATIGUE
18
3
473
479
This study examined the torque-velocity and power-velocity relationships of quadriceps muscle function, stretch shortening cycle function, and leg-spring stiffness in sprint and endurance athletes. Isokinetic maximal knee extension torque was obtained from 7 sprinters and 7 endurance athletes using a Con-trex isokinetic dynamometer. Torque and power measures were corrected for lean-thigh cross-sectional area and lean-thigh volume, respectively. Stretch-shortening cycle function and muscle stiffness measurements were obtained while subjects performed single-legged squat, countermovement, and drop-rebound jumps on an inclined sledge and force-plate apparatus. The results indicated that sprinters generated, on average, 0.15 +/- 0.05 N(.)m(.)cm(-2) more torque across all velocities compared with endurance athletes. Significant differences were also found in the power-velocity relationships between the 2 groups. The sprinters performed significantly better than the endurance athletes on all jumps, but there were no differences in prestretch augmentation between the groups. The average vertical leg stiffness during drop jumps was significantly higher for sprinters (5.86 N(.)m(-1)) compared with endurance runners (3.38 N(.)m(-1)). The findings reinforce the need for power training to be carried out at fast contraction speeds but also show that SSC function remains important in endurance running.
1064-8011
10.1519/00124278-200408000-00014
Grant Details