A comparison of manual and automatic force-onset identification methodologies and their effect on force-time characteristics in the isometric midthigh pull

Guppy, SN ORCID: https://orcid.org/0000-0001-9209-7409, Brady, CJ, Kotani, Y, Connolly, S, Comfort, P ORCID: https://orcid.org/0000-0002-1131-8626, Lake, JP and Haff, GG ORCID: https://orcid.org/0000-0002-0676-7750 2021, 'A comparison of manual and automatic force-onset identification methodologies and their effect on force-time characteristics in the isometric midthigh pull' , Sports Biomechanics , pp. 1-18.

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Abstract

The aim of this study was to assess the agreement of three different automated methods of identifying force-onset (40 N, 5 SDs, and 3 SDs) with manual identification, during the isometric mid-thigh pull (IMTP). Fourteen resistance-trained participants with >6 months experience training with the power clean volunteered to take part. After three familiarisation sessions, the participants performed five maximal IMTPs separated by 1 min of rest. Fixed bias was found between 40 N and manual identification for time at force-onset. No proportional bias was present between manual identification and any automated threshold. Fixed bias between manual identification and automated was present for force at onset and F150. Proportional but not fixed bias was found for F50 between manual identification and all automated thresholds. Small to moderate differences (Hedges g = −0.487- −0.692) were found for F90 between all automated thresholds and manual identification, while trivial to small differences (Hedges g = −0.122—−0.279) were found between methods for F200 and F250. Based on these results, strength and conditioning practitioners should not use a 40 N, 5 SDs, or 3 SDs threshold interchangeably with manual identification of force-onset when analysing IMTP force–time curve data.

Item Type:	Article
Additional Information:	** From Crossref journal articles via Jisc Publications Router **Journal IDs: pissn 1476-3141; eissn 1752-6116 **History: issued 22-09-2021; published_online 22-09-2021
Schools:	Schools > School of Health and Society
Journal or Publication Title:	Sports Biomechanics
Publisher:	Taylor & Francis
ISSN:	1476-3141
Related URLs:	Publication
Funders:	Australian Government Research Training Program Scholarship
SWORD Depositor:	Publications Router
Depositing User:	Publications Router
Date Deposited:	22 Dec 2021 08:53
Last Modified:	15 Feb 2022 16:37
URI:	http://usir.salford.ac.uk/id/eprint/61964

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