Home > Journals > The Journal of Sports Medicine and Physical Fitness > Past Issues > Articles online first > The Journal of Sports Medicine and Physical Fitness 2022 Jul 11

CURRENT ISSUE
 

JOURNAL TOOLS

Publishing options
eTOC
To subscribe
Submit an article
Recommend to your librarian
 

ARTICLE TOOLS

Publication history
Reprints
Permissions
Cite this article as
Share

 

Original Article   

The Journal of Sports Medicine and Physical Fitness 2022 Jul 11

DOI: 10.23736/S0022-4707.22.13751-5

Copyright © 2022 EDIZIONI MINERVA MEDICA

language: English

Joint specificity of stretch shortening cycle potentiation at propulsion onset during jump test performance

Marzouq K. ALMUTAIRI 1, 2, Gary R. HUNTER 3, Mario INACIO 4, 5, 6, Christopher P. HURT 1, Donald H. LEIN 1, William R. REED 1, Harshvardhan SINGH 1

1 Department of Physical Therapy, University of Alabama at Birmingham, Birmingham, AL, USA; 2 Department of Physical Therapy, Qassim University, Qassim, Saudi Arabia; 3 Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, AL, USA; 4 Department of Physical Education and Sports Science, University Institute of Maia, Porto, Portugal; 5 Research Center for Sport Sciences, Health Sciences and Human Development, Vila Real, Portugal; 6 Faculty of Health and Life Sciences, Oxford Brookes University, Oxford, UK


PDF


BACKGROUND: Joint specific stretch-shortening cycle (SSC) potentiation of lower extremity joints at propulsion onset during jump test performance (JTP) can temporally affect SSC potentiation. However, joint-specific SSC potentiation at propulsion onset during JTP is unknown.
METHODS: Twenty-two healthy young adults, 12 men and 10 women, performed: vertical jumps (a) with a preliminary countermovement (CMJ), (b) from a squat position held isometrically for 2-3 seconds at the same knee angle of CMJ (SJ), and (c) after landing from a 15 cm high platform (DJ). Kinetics and kinematics of lower extremity joints were collected. The propulsion onset was calculated uniquely for the hip, knee, and ankle joints and defined as the first positive data point (after the eccentric phase) of the joint angular velocity for each respective joint. SSC potentiation was calculated as the ratio of jump height (JH) and joint extensor moments for CMJ/SJ, DJ/SJ, and DJ/CMJ.
RESULTS: JH ratio for CMJ/SJ, DJ/SJ, and DJ/CMJ were > 1 (all p < 0.01). Hip, knee, and ankle extensor moment ratio was > 1 (all p < 0.01) for CMJ/SJ and DJ/SJ, while for DJ/CMJ, extensor moment ratio was > 1 only for the ankle (p < 0.03). SSC potentiation was greatest at the ankle followed by the hip and knee for CMJ/SJ and DJ/SJ (all p < 0.05).
CONCLUSIONS: SSC potentiation at propulsion onset was largest at the ankle followed by hip and knee. Our findings emphasize the importance of the ankle versus hip and knee joints regarding SSC potentiation at the very beginning of JTP.


KEY WORDS: Jump; Eccentric; Concentric; Moment; Muscle; Joint

top of page