A new approach for classification of stretch-shortening cycle: Beyond 250 ms of ground contact time

The stretch-shortening cycle (SSC) has been classified into fast (250 ms) groups based on ground contact time (GCT) threshold values. However, there are gaps in the literature on how the 250 ms threshold value was found and which variables affect it. The purpose of this study is to validate the 250 ...

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Bibliographic Details
Published in:Journal of sports sciences 2024-09, Vol.42 (17), p.1617-1626
Main Authors: Ünver, Evrim, Konşuk Ünlü, Hande, Yıldız, Adalet E., Cinemre, Şükrü Alpan
Format: Article
Language:English
Subjects:
Achilles Tendon
Drop jump
ground contact time
Mechanical properties
reactive strength index
regression tree
Variables
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Summary:The stretch-shortening cycle (SSC) has been classified into fast (250 ms) groups based on ground contact time (GCT) threshold values. However, there are gaps in the literature on how the 250 ms threshold value was found and which variables affect it. The purpose of this study is to validate the 250 ms threshold by investigating the factors affecting this threshold. For this purpose, force-time variables during a drop jump (DJ) with a force plate and achilles tendon (AT) muscle-tendon unit mechanical properties using shear-wave elastography in 46 recreationally active men were analysed. A regression tree analysis was conducted using R studio to classify GCT with correlated variables (p 
ISSN:0264-0414
1466-447X
1466-447X
DOI:10.1080/02640414.2024.2403873