I ask about the convenient test to evaluate the leg power in sports, and the relationship between horizontal, vertical jump and leg power.
The most suitable test to evaluate specific leg power is vertical/horizontal jump. However, the accelerometers (such as Myotest) are better to measure power in vertical than in horizontal tests (Tendo equipment could measures in any direction using a cable attached to the subject or bar). Some studies showed correlations that could explain this question about relationship jump and leg power, such as between jump height and peak power.
Harding FV, JL Fairley, R Salinas, GJ Salem, MG Fortanasce. An investigation of the relationship between an open kinetic chain test of quadriceps power and a functional test of leg power. Phys Ther. 78(5):S77(PL-RR-232-SA), 1998.
Harding FV, JL Fairley, R Salinas, GJ Salem, MG Fortanasce (1998). An investigation of the relationship between an open kinetic chain test of quadriceps power and a functional test of leg power. APTA Scientific Meeting and Exposition, Orlando, Florida, June.
AN INVESTIGATION OF THE RELATIONSHIP BETWEEN AN OPEN KINETIC CHAIN TEST OF QUADRICEPS POWER AND A FUNCTIONAL TEST OF LEG POWER
HARDING FV, JL FAIRLEY, R SALINAS, GJ SALEM, MG FORTANASCE
FORTANASCE & ASSOCIATES PHYSICAL THERAPY/SPORTS MEDICINE CENTER, ARCADIA, CA; DEPARTMENT OF BIOKINESIOLOGY AND PHYSICAL THERAPY, UNIVERSITY OF SOUTHERN CALIFORNIA, LOS ANGELES, CA, USA
PURPOSE: The single-leg hop test (Daniel et al., 1982; Tegner et al., 1986) is an objective measure of leg power used for determining rehabilitation outcomes in ACL reconstruction. It is generally thought of as a test used for return to activity or late in the rehabilitation process. The purpose of this investigation was to determine if a predictable relationship exists between a single-leg hop test and a maximal knee extension test on a BTE Dynatrac isotonic dynamometer.
SUBJECTS: Fifteen healthy male subjects (age: 24.9 + 6.0 yrs.; ht: 177.8 + 8.7 cm; wt: 83.2 + 11.3 kg) gave informed consent and participated in the data collection.
METHODS AND MATERIALS: Subjects performed three trials of the single-leg hop test with each leg, maximal distance (Hop) jumped was recorded for each leg. Three 1 RM trials at two predetermined torques (27.1 Nm, 74.5 Nm) were performed on the Dynatrac with each leg, maximal power (MaxP) and maximal velocity (MaxV) were recorded. Hop, MaxP, and MaxV were analyzed using the correlation routine in SPSS 7.5 for Windows (SPSS, INC., Chicago, IL) on a Dell XPS Pro200n computer (Dell Computer Corp., Austin, TX).
RESULTS: The correlations between MaxP and Hop (r = 0.250, p = 0.672) and between MaxV and Hop (r = 0.250, p = 0.182) were not significant.
CONCLUSIONS: These results point to the difficulty of equating functional outcomes with tests of isolated joint movements. Further research is needed to determine what the relationship is between the results of isolated tests of muscle function and actual performances. If some type of specific relationship exists between these performances, the information could be used to insure the efficient use of exercise to expedite the rehabilitation process for patients after ACL reconstruction and other types of knee injuries. The results also point out the need for instrumented biomechanical analysis to determine power output and other kinetic and kinematic variables that relate to functional performances of this type.
The horizontal system in terms of power sharing is equal. Two joined company are able to maximize the resources on an equal level. However, Vertical system is mostly controlled by one party on the top.
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