Analysis of Characterizing Phases on Waveforms: An Application to Vertical Jumps

in Journal of Applied Biomechanics
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  • 1 Dublin City University
  • 2 CLARITY: Centre for Sensor Web Technologies
  • 3 Sports Surgery Clinic, Dublin
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The aim of this study is to propose a novel data analysis approach, an analysis of characterizing phases (ACP), that detects and examines phases of variance within a sample of curves utilizing the time, magnitude, and magnitude-time domains; and to compare the findings of ACP to discrete point analysis in identifying performance-related factors in vertical jumps. Twenty-five vertical jumps were analyzed. Discrete point analysis identified the initial-to-maximum rate of force development (P = .006) and the time from initial-to-maximum force (P = .047) as performance-related factors. However, due to intersubject variability in the shape of the force curves (ie, non-, uni- and bimodal nature), these variables were judged to be functionally erroneous. In contrast, ACP identified the ability to apply forces for longer (P < .038), generate higher forces (P < .027), and produce a greater rate of force development (P < .003) as performance-related factors. Analysis of characterizing phases showed advantages over discrete point analysis in identifying performance-related factors because it (i) analyses only related phases, (ii) analyses the whole data set, (iii) can identify performance-related factors that occur solely as a phase, (iv) identifies the specific phase over which differences occur, and (v) analyses the time, magnitude and combined magnitude-time domains.

Chris Richter is with Applied Sports Performance Research, School of Health and Human Performance, Dublin City University, Dublin; with CLARITY: Centre for Sensor Web Technologies; and with Sports Surgery Clinic, Santry Demesne, Dublin, Ireland. Noel E. O’Connor is with CLARITY: Centre for Sensor Web Technologies. Brendan Marshall is with Applied Sports Performance Research, School of Health and Human Performance, Dublin City University, and with Sports Surgery Clinic, Santry Demesne, Dublin, Ireland. Kieran Moran is with Applied Sports Performance Research, School of Health and Human Performance, Dublin City University, Dublin, Ireland. Address author correspondence to Chris Richter at mr.chris.richter@gmail.com.