Measurement of short term power output: Comparison between cycling and jumping

Abstract

Maximal power output during short term constant velocity cycling and vertical jumping from a force platform has been studied in five healthy young male subjects. From the measurements on the force platform the peak (instantaneous) power output (P), net impulse (I,), force (F,), velocity of take-off (V,) and height ofjump (h) were calculated. The corresponding values for power (H), force (F) and velocity (V) on the bicycle were obtained from analysis of the force-velocity relationship.The results (mean* S.D.) showed that on the force platform F,, P, I,, V, and h were 1073+167N,2205f 310W, 154+17Ns,2.48f OlSms-' and 31k4crn. h was positively associated with both I, (r = + 0.77) and P (r = 0.67). The mean maximal power output for cycling was 854W(39%) greater than jumping and yas achieved at a 271 N (25%) increase in F and a reduction in V. Nevertheless they were closely related.Platform P ( W ) = 717.6+ 0,483 bicycle H(W) r = f0.74 A comparison of linear and curvilinear (hyperbolic) analysis of the F / V bicycle data showed that the latter did not reduce the variance of observations and was not, therefore, statistically justifiable (Wilkie 1950). The mean intra-subject variations of P and H were 6.6%_+ 1.8 and 40%+ 1.2. The relative values of F and Vat H were both found to be approximately 50% of their respective maximal values.It was concluded that short term power output can be measured simply and accurately in man during the performance of two activities. Rotational movement of the legs as in cycling produces higher values of peak power output then vertically lifting body weight. For the achievement of peak power output in cycling, relative force and speed of movement must both correspond to approximately half of their respective maximal values.

Jumping abilities and power-velocity relationship in judo athletes: Comparative analysis among age categories

“…In our study the F-v curves were linear. This is consistent with results obtained for lower extremities by other authors [20,21]. In the paper of Hintzy et al [22] average v o values amounted to 123.1 ± 11.2 rpm and P max · BM -1 to 11.1 ± 1.6 W · kg -1 .…”

Measurement of specific movement power application: evaluation of weight lifters

“…In knee extensor isokinetic testing, Thorstensson et al (1976 ) reported that variation of measurements on two occasions on diOE erent angle of the knee joint or lever arm velocity averaged 10% . In multi-articular explosive movement such as vertical jump, on the other hand, individual variation of peak power averaged 6.6% (Davies et al 1984(Davies et al ). M argaria et al (1966 reported that variations in two measurem ents of power calculated by the movement of stair clim bing was within the range of 6 4% .…”

Relationships between power outputs measured from force-velocity test, Optojump test and Five-jump test in male shot putters

“…They found also a powerful correlation between force platform and Optojump (r = 0.99; P < 0.0001). For instance, a study performed on a force platform by Davies and Young [10] showed that the height reached during V·J is correlated with peak power produced during the impulse. The same study also showed a significant correlation between the estimated PPO from V·J and PPO Ergo .…”

“…Although, 5JT performance is generally expressed in absolute and relative terms, subject body mass and leg length can strongly influence the performance. Davies and Young [10] showed that PPO produced during the impulse on the force platform was correlated with the V·J height and PPO Ergo . Vandewalle et al [11] found significant correlation between V·J performance and PPO Ergo , in subjects practicing different sports.…”

“…The force-velocity test is the most used one to assess PPO of upper and lower limbs (PPO Ergo ) [3,7,8]. Significant correlations were recorded between vertical jump (V·J) and PPO Ergo in sprinters [9], swimmers [8], cycling [10], rugby [11] and tennis players [4,12].…”