Abstract
Objective:
To determine the reliability of ground reaction force during a vertical jump.
Design and Setting:
Two test sessions 48 hours apart in which subjects performed five maximal vertical jumps with their right lower extremity on a force platform without arm movement. Applied Biomechanics Laboratory at the University of Toledo.
Subjects:
Nineteen healthy males (n = 12) and females (n = 7), with an average age of 21.3 years and 23.2 years, respectively, from the University of Toledo participated in this study. The average height for males and females was 70.0 and 66.6 inches, respectively. The average weight for males was 170.5 lbs., while the average weight for females was 132.4 lbs.
Measurements:
Reliability of the peak vertical ground reaction force and vertical impulse was assessed using the formula for intraclass correlation coefficient (2,1) (ICC [2,1]).
Results:
Measurement of peak vertical ground reaction force was demonstrated to be very reliable (ICC [2,1] rxx = .94; SEM = .003% BW), whereas the reliability estimate for vertical impulse was not very reliable (ICC [2,1] rxx = .22; SEM = .24% BW seconds). Furthermore, no significant relationship was found between peak vertical ground reaction force and vertical impulse. (BW = body weight; SEM = standard error of measurement).
Conclusions:
We conclude that peak force measured during a one-legged vertical jump is reliable and may provide an alternate method of evaluation of lower extremity functional strength.
Keywords: ground reaction forces, vertical jump, functional strength assessment, closed kinetic chain
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Selected References
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- Bobbert M. F., Van Soest A. J. Effects of muscle strengthening on vertical jump height: a simulation study. Med Sci Sports Exerc. 1994 Aug;26(8):1012–1020. [PubMed] [Google Scholar]
- Bosco C., Luhtanen P., Komi P. V. A simple method for measurement of mechanical power in jumping. Eur J Appl Physiol Occup Physiol. 1983;50(2):273–282. doi: 10.1007/BF00422166. [DOI] [PubMed] [Google Scholar]
- Bunton E. E., Pitney W. A., Cappaert T. A., Kane A. W. The role of limb torque, muscle action and proprioception during closed kinetic chain rehabilitation of the lower extremity. J Athl Train. 1993 Spring;28(1):10–20. [PMC free article] [PubMed] [Google Scholar]
- Cordova M. L., Ingersoll C. D., Kovaleski J. E., Knight K. L. A comparison of isokinetic and isotonic predictions of a functional task. J Athl Train. 1995 Oct;30(4):319–322. [PMC free article] [PubMed] [Google Scholar]
- Gauffin H., Tropp H. Altered movement and muscular-activation patterns during the one-legged jump in patients with an old anterior cruciate ligament rupture. Am J Sports Med. 1992 Mar-Apr;20(2):182–192. doi: 10.1177/036354659202000215. [DOI] [PubMed] [Google Scholar]
- Harman E. A., Rosenstein M. T., Frykman P. N., Rosenstein R. M. The effects of arms and countermovement on vertical jumping. Med Sci Sports Exerc. 1990 Dec;22(6):825–833. doi: 10.1249/00005768-199012000-00015. [DOI] [PubMed] [Google Scholar]
- Noyes F. R., Barber S. D., Mangine R. E. Abnormal lower limb symmetry determined by function hop tests after anterior cruciate ligament rupture. Am J Sports Med. 1991 Sep-Oct;19(5):513–518. doi: 10.1177/036354659101900518. [DOI] [PubMed] [Google Scholar]
- Palmitier R. A., An K. N., Scott S. G., Chao E. Y. Kinetic chain exercise in knee rehabilitation. Sports Med. 1991 Jun;11(6):402–413. doi: 10.2165/00007256-199111060-00005. [DOI] [PubMed] [Google Scholar]
- Risberg M. A., Ekeland A. Assessment of functional tests after anterior cruciate ligament surgery. J Orthop Sports Phys Ther. 1994 Apr;19(4):212–217. doi: 10.2519/jospt.1994.19.4.212. [DOI] [PubMed] [Google Scholar]
- Smith M. J., Melton P. Isokinetic versus isotonic variable-resistance training. Am J Sports Med. 1981 Jul-Aug;9(4):275–279. doi: 10.1177/036354658100900420. [DOI] [PubMed] [Google Scholar]