A proposed method for evaluating drop jump performance with one force platform

McMahon, JJ; Lake, JP; Stratford, C; Comfort, P

Abstract

The drop jump (DJ) is commonly utilised to assess athletes. The criterion two force platform (2FP) method of assessing DJ performance involves two adjacent force platforms, one for the box and one for the athlete to rebound from. Most researchers and practitioners only have access to one force platform (1FP) and they rarely account for the often considerable discrepancy between box height and drop height (DH). Therefore, this study aimed to determine the criterion validity of evaluating DJ performance with 1FP. Twenty-six young male sports students performed three DJs, from a 0.30 m and 0.40 m high box, on two adjacent force platforms. The DH, touchdown velocity and several performance variables were calculated using the 2FP and 1FP methods. Ordinary least-products regression identified no fixed or proportional bias between methods for any DJ variable. The mean DH was 10% lower than the 0.30 m box and 14% lower than the 0.40 m high box. This discrepancy highlights the importance of accounting for DH when conducting DJ assessments. In conclusion, the 1FP method of evaluating DJ performance is a valid alternative to the criterion 2FP method and could be embedded into automated force analysis software for researchers and practitioners to utilise.

Citation

McMahon, J., Lake, J., Stratford, C., & Comfort, P. (2021). A proposed method for evaluating drop jump performance with one force platform. Biomechanics, 1(2), 178-189. https://doi.org/10.3390/biomechanics1020015

• Journal Article Type: Article
• Acceptance Date: Jul 12, 2021
• Publication Date: Jul 16, 2021
• Deposit Date: Jul 19, 2021
• Publicly Available Date: Jul 19, 2021
• Journal: Biomechanics
• Print ISSN: 2673-7078
• Publisher: MDPI
• Volume: 1
• Issue: 2
• Pages: 178-189
• DOI: https://doi.org/10.3390/biomechanics1020015
• Publisher URL: https://doi.org/10.3390/biomechanics1020015
• Related Public URLs: https://www.mdpi.com/journal/biomechanics
• Additional Information: Additional Information : ** From MDPI via Jisc Publications Router ** Licence for this article: https://creativecommons.org/licenses/by/4.0/ **Journal IDs: eissn 2673-7078 **History: published 16-07-2021; accepted 12-07-2021