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Influence of passive stiffness on vertical jump for specialists and control subjects.

Westrelin, Mathieu
(2022)

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Westrelin_Mathieu_44741800_2021-2022.pdf
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Details

Supervisors
Nguyen, Anh Phong
Faculty
Faculté des sciences de la motricité
Degree label
Master [60] en kinésithérapie et réadaptation
Abstract
Introduction : Vertical jump is very important in sport performance. The main objective of the present study was to observe passive stiffness of the patellar and Achilles tendon on vertical jump performance between a specialized and non-specialized population. Methods : This study was designed as a preliminary cross-sectional study. Only male participants were recruited in the specialized group. Then, the sedentary control group was matched in age, size and weight. The specialized group should be experimented in vertical jumping activities. Passive stiffness of the patellar tendon and Achilles tendon were measured using MyotonPro on both legs in four different positions. Jump performance were evaluated on 3 tests: SJ, DJ and CMJ Results : Specialized group demonstrated more patellar tendon stiffness than control in relax position (+57.3 N/m. p=0.02. 95%CI: 6.91-87.69 N/m) and in sitting position (+67.37 N/m, p=0.03, 95% CI: 7.35-127.38 N/m). There were no significant differences in stiffness in others localization and positions. T-test showed a significant difference between control and handball group in SJ (25.1 VS 32.7), CMJ (25.7 VS 33.4) and DJ (27.6 VS 34.5) with excellent power. A positive but moderate correlation between jumping performance in CMJ and SJ and passive stiffness in patellar tendon in a relax position with 90° knee flexion position. There were no other significant correlations with other recorded data. Conclusion : Our data do not allow us to confirm our hypothesis which was that elastic stiffness should be correlated to DJ and CMJ movements by energy restitution effect. But we have seen a significant stiffness difference in the patellar tendon in relax or sitting position between control and specialist group. This difference could be explained jumping performance but there is not the only value that explains it.