|
UPSI Digital Repository (UDRep)
|
|
| ||||||||||||||||
| Abstract : |
| Journal of Sports Science and Physical Education 5(2): 9-14, 2016 - Jump squat tests can be used to investigate the differences in the force - velocity (f-v) profile in movement that is more a sport-specific than isolated exercises such as open chain leg extension. However, squat jumps involve multi-joint movement, making it questionable which muscle is the main contributor for the movement. The main aim of this study is to develop a test of isolated knee extension that encompasses the entire range of human f-v relationship and to investigate the correlation between linear encoder and kinematic measurement of angular velocity using a camera system during unloaded kicking. One healthy male subject volunteered to participate in the study and performed 10 unloaded kicks (knee extension). A cuff was strapped around the lower leg, approximately 2 cm above the medial malleoli and connected to a linear velocity encoder (MuscleLab Ergotest version 4010, Norway). During the test sessions, threedimensional motion analysis was performed with an Oqus Motion Capture System (Qualisys, Sweden). Data were transferred to Windows-based data acquisition software (Qualisys Track Manager). There was a positive linear relationship (r = 0.94). The unloaded kicking test to determine maximum angular velocity at knee extension measured using the QTM showed that the mean angular velocity was 362˚.s-1, with the highest value being 528˚.s-1. This preliminary study suggests isokinetic dynamometry (IKD) can be used to investigate the entire range of velocities (i.e isometric – velocity maximum) of knee extension in normal human subjects. Further studies can examine the use of IKD in measuring higher velocities. |
| References |
1. Andersen, L. L., Andersen, J. L., Magnusson, S.P., Suetta, C., Madsen, J. L., Christensen L. R. & Aagaard, P. (2005). Changes in the human muscle force-velocity relationship in response to resistance training and subsequent detraining. J Appl Physiol., 99, 87-94. 2. Aragon-Vargas, L.F, & Gross, M.M. (1997). Kinesiological factors in vertical jump performance: differences among individuals. Journal of Applied Biomechanics, 13, 24– 44. 3. Bobbert, M. F., Huijing, P. A., & van Ingen Schenau, G. J. (1986). An estimation of power output and work done by the human triceps surae muscle-tendon complex in jumping. J. Biomech. 19, 899-906. 4. Cormie, P., McGuigan, M. R., & Newton, R. U. (2010). Influence of strength on magnitude and mechanisms of adaptation to power training. Med Sci Sports Exerc, 42, 1566-1581. 5. De Lateur, B.J. (1996). Therapeutic exercise. Phy Med Rehab. WB Saunders, Philadelphia. 401-419. 6. Dempster, W.T. (1955). Space requirements for the seated operator. WADC Technical Report.55-159. Wright-Patterson Air Force Base, Ohio. 7. Hanavan, E.P. (1964). A mathematical model of the human body. Technical Report AMRLTR- 64-102. Wright-Patterson Air Force Base, Ohio. 8. Huang, M.H., Lin, Y.S., R.C. & Lee, C.L. (2003). A Comparison of Various Therapeutic Exercises on the functional Status of Patients with Knee Osteoarthritis. Semin Arthritis Rheum, 32, 398-406. 9. Iossifidou, A., Batzopoulus, V. & Giakas, G. (2005). Isokinetic knee extension and vertical jumping: Are they related? Journal of sports sciences, 23(10), 1121-1127. |
| This material may be protected under Copyright Act which governs the making of photocopies or reproductions of copyrighted materials. You may use the digitized material for private study, scholarship, or research. |