Effect of Countermovement and Arm Swing on Vertical Stiffness and Jump Performance

  • Azadeh Shadmehr Department of Physical Therapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran.
  • S. Maryam Hejazia Department of Physical Therapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran.
  • Gholamreza Olyaei Department of Physical Therapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran.
  • Saeid Talebian Department of Physical Therapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran.

Abstract

Objectives To determine the effect of using arm swing and countermovement on vertical stiffness and maximum vertical jump performance.Participants A total of 25 young healthy females were participated in the study. They stood on the force plate and performed two models ofsquat jump with (SJA) and without arm swing (SJ) and two models of countermovement jump with (CMJA) and without arm swing (CMJ).Main outcome measures Vertical leg stiffness, jump height, flight time, contact time and power were compared in SJ, SJA, CMJ and CMJA.Results In the CMJs, the stiffness and jump height were significantly higher than SJA and SJ. Contact time in jumps with countermovement and/orarm swing was three times lower than SJA and SJ.Conclusion Vertical stiffness and performance parameters can be improved by using countermovement and arm swing during vertical jumpand due to enhancement in work output and ground reaction force.
share this Article by
Published
2016-03-26
How to Cite
SHADMEHR, Azadeh et al. Effect of Countermovement and Arm Swing on Vertical Stiffness and Jump Performance. Journal of Contemporary Medical Sciences, [S.l.], v. 2, n. 5, p. 25-27, mar. 2016. ISSN 2413-0516. Available at: <http://www.jocms.org/index.php/jcms/article/view/66>. Date accessed: 25 july 2017.
Section
Articles

Keywords

vertical stiffness, countermovement, arm swing, jump height