The Number of Trials Required to Obtain a Representative Movement Pattern During a Hurdle Hop Exercise

in Journal of Applied Biomechanics
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  • 1 Sports Surgery Clinic Dublin
  • 2 Dublin City University
  • 3 Insight Centre for Data Analytics
  • 4 University of Melbourne
  • 5 University College Cork
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When reporting a subject’s mean movement pattern, it is important to ensure that reported values are representative of the subject’s typical movement. While previous studies have used the mean of 3 trials, scientific justification of this number is lacking. One approach is to determine statistically how many trials are required to achieve a representative mean. This study compared 4 methods of calculating the number of trials required in a hopping movement to achieve a representative mean. Fifteen males completed 15 trials of a lateral hurdle hop. Range of motion at the trunk, pelvis, hip, knee, and ankle, in addition to peak moments for the latter 3 joints were examined. The number of trials required was computed using a peak intraclass correlation coefficient method, sequential analysis with a bandwidth of acceptable variance in the mean, and a novel method based on the standard error of measurement (SEMind). The number of trials required across all variables ranged from 2 to 12 depending on method, joint, and anatomical plane. The authors advocate the SEMind method as it demonstrated fewer limitations than the other methods. Using the SEMind, the required number of trials for a representative mean during the lateral hurdle hop is 6.

Shane J. Gore and Brendan M. Marshall are with the Sports Medicine Department, Sports Surgery Clinic, Dublin, Ireland; the School of Health and Human Performance, Dublin City University, Dublin, Ireland; and the Insight Centre for Data Analytics, Dublin City University, Dublin, Ireland. Andrew D. Franklyn-Miller is with the Sports Medicine Department, Sports Surgery Clinic, Dublin, Ireland; and the Centre for Health, Exercise and Sports Medicine, University of Melbourne, Melbourne, Australia. Eanna C. Falvey is with the Sports Medicine Department, Sports Surgery Clinic, Dublin, Ireland; and the Department of Medicine, University College Cork, Cork, Ireland. Kieran A. Moran is with the School of Health and Human Performance, Dublin City University, Dublin, Ireland; and the Insight Centre for Data Analytics, Dublin City University, Dublin, Ireland.

Address author correspondence to Shane J. Gore at Shane.gore2@gmail.com.