The Reliability and Magnitude of Time-Dependent Force-Time Characteristics During the Isometric Midthigh Pull Are Affected by Both Testing Protocol and Analysis Choices

Stuart N. Guppy; Yosuke Kotani; Shannon Connolly; Claire J. Brady; Paul Comfort; G. Gregory Haff

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The Reliability and Magnitude of Time-Dependent Force-Time Characteristics During the Isometric Midthigh Pull Are Affected by Both Testing Protocol and Analysis Choices

Stuart N. Guppy ^[1] ; Yosuke Kotani ^[1] ; Shannon Connolly ^[3] ; Claire J. Brady ^[4] ; Paul Comfort ^[2] ; G. Gregory Haff
1. [1] Edith Cowan University
  
  Edith Cowan University
  
  Australia
2. [2] Leeds Beckett University
  
  Leeds Beckett University
  
  Reino Unido
3. [3] Western Australian Institute of Sport, Mt Claremont, Australia
4. [4] Sport Ireland Institute, Abbotstown, Dublin, Ireland
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Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 36, Nº. 5, 2022, págs. 1191-1199
Idioma: inglés
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Resumen
- This study aimed to investigate whether the use of short-duration (SHORT) isometric midthigh pull (IMTP) trials resulted in greater reliability and magnitude of time-dependent force-time characteristics than traditionally performed IMTP trials (TRAD). Fourteen subjects with >6 months' training experience with the power clean volunteered to take part in the study. Subjects performed five ~1-second IMTP trials (SHORT) and five 5-second IMTP trials (TRAD). SHORT resulted in substantially more reliable rate of force development (RFD) measures (intraclass correlation coefficient [ICC] = 0.97-0.99; coefficient of variation [CV] = 2.6-7.0%), particularly during time bands from force-onset to 150 ms, compared with TRAD when trials were selected for analysis based on peak force (ICC = 0.66-0.83; CV = 14.1-38.5%). Selecting TRAD trials based on RFD0-200 resulted in similar reliability compared with SHORT of those same epochs (ICC = 0.97-0.99; CV = 2.5-7.8%). Furthermore, SHORT resulted in significantly greater force at specific time points, RFD, and impulse compared with TRAD trials (p = 0.001-0.033; g = -0.16 to -0.66). Based on these results, strength and conditioning professionals should use specific testing protocols (i.e., TRAD and SHORT) depending on the component of an athlete's force-generating capacity that they wish to assess and remain aware of the effect analysis choices they have on the reliability of IMTP force-time characteristics.