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Biomechanics/Neuromuscular

(08) ISOMETRIC FORCE PRODUCTION CAPACITIES AND THEIR ASSOCIATIONS WITH JUMPING ECCENTRIC METRICS

Thursday, July 11, 2024
10:15 AM – 10:30 AM East Coast USA Time
Location: Room 337-338

    Podium Presenter(s)

  • Yi-Chien Chiang, CSCS

    Master's student
    National Taiwan Sport University
    Tainan City, Tainan, Taiwan (Republic of China)

    • Author(s)

  • CC

    Chieh-Ying Chiang

    Associate Research Fellow
    Taiwan Institute of Sport Science
    New Taipei, New Taipei, Taiwan (Republic of China)

  • HC

    Hui-Yun Cheng

    Assistant professor
    Chinese Culture University
    Taipei, Taipei, Taiwan (Republic of China)

  • Wei-Yeh Joshua Chien (he/him/his)

    Ｍaster's Student
    National Taiwan Sports University
    Wanhua Dist, Taipei, Taiwan (Republic of China)

Abstract Details:

Background: Basketball is a sport characterized by repetitive jumping movements, often reliant on the Stretch-Shortening Cycle (SSC) mechanism at specific joint angles. Previous research has discovered interrelationships between isometric strength and jumping performance. However, the association between isometric and eccentric force production under joint-specific angles remains unclear.

Purpose: To investigate the connections between isometric and eccentric force production from two strength assessments.

Methods: Fourteen Taiwanese national-level women's basketball team players underwent force plate testing for isometric mid-thigh pull (IMTP) and countermovement jump (CMJ). Customized Python software was used to calculate kinetic variables. IMTP variables included rate of force development at 150 milliseconds (RFD150), rate of force development at 250 milliseconds (RFD250), impulse at 150 milliseconds (IMP150), and impulse at 250 milliseconds (IMP250). CMJ variables included braking phase rate of force development (B-RFD), and braking phase impulse (B-IMP). Pearson's product-moment correlation was employed for statistical analysis, with significance set at p < 0.05.

Results: Strong positive correlations were found between IMTP and CMJ variables. B-RFD showed a significant correlation with RFD150 (r = 0.766, p = 0.001) and RFD250 (r = 0.682, p = 0.007). Additionally, B-IMP correlated significantly with IMP250 (r = 0.739, p = 0.003).

Conclusions: Female basketball athletes with higher isometric force production also demonstrated better eccentric force-generating capacities. Isometric strength training at specific joint angles may benefit basketball players’ jumping performance. However, further research is warranted to further explore this topic. PRACTICAL APPLICATIONS: The results of this study may be attributed to the influence of isometric strength on the SSC amortization phase. This finding can assist strength and conditioning coaches in developing athletes’ isometric strength, which may further translate into better braking abilities during jumping.
 

Acknowledgements: None