A Test of Leg Power

The Relationship of Isokinetic Torque at Two Speeds to the Vertical Jump

“…Pounds displaced while jumping gives a better indication of total work performed. Gray, Start, and Glencross (1962) showed that all correlations with their vertical power jump were higher for work performed than distance covered. Table 2 lists the correlations among the variables.…”

A simple method for measuring force, velocity and power output during squat jump

“…Such a simple field method has been an important focus for athlete training evaluation for decades (Bosco et al, 1983;Canavan and Vescovi, 2004;Gray et al, 1962;Harman et al, 1991;Sayers et al, 1999). Our equations result from computations based on fundamental laws of mechanics, and no postulate in conflict with reality was required, as it was the case for instance in the work of Gray et al (1962).…”

“…Some of them are derived from fundamental laws of mechanics (Gray et al, 1962;Lewis cited in Fox and Mathews, 1974), but the underlying biomechanical models from which they were developed have been challenged. Indeed, it has been argued that Lewis's formula divides the change in potential energy by the aerial ascending phase duration instead of that of the push-off, and does not take into account the change in potential energy during push-off (Harman et al, 1991;Vandewalle et al, 1987b).…”

Measurement of specific movement power application: evaluation of weight lifters

“…The studies that measured power during a explosive leg extension with the hip, knee and ankle joints extended at a time discussed the reproducibility by the correlation coe cient of 0.88 ± 0.95 for additional loading method (Avis et al 1985 ) and 0.995 for the device by inertialoading method (Bassey and Short 1990 ). In vertical jump, the correlation coe cient between two identical power m easurements was 0.95 (Bosco et al 1983 ) and 0.985 (Gray et al 1962a ). Reproducibility of power obtained by the maximum pedalling of the bicycle ergometer was r = 0.91 (Patton et al 1985 ).…”

“…Conventionally, in the measurement of mechanical power for example, for vertical jump (Gray et al 1962a, Davies and Rennie 1968, Bosco et al 1983, Davies et al 1984 and maximum acceleration pedalling (Davies et al 1984, Nakam ura et al 1985, Bar-Or 1987, m any studies report the power calculated from one direct measurem ent of the two essential factors, i.e. force or velocity.…”