Classifying performer strategies in drop landing activities |
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| Authors: | Andrew D Nordin Janet S Dufek C Roger James Barry T Bates |
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| Institution: | 1. School of Kinesiology, University of Michigan, Ann Arbor, MI, USA;2. Kinesiology and Nutrition Sciences, University of Nevada, Las Vegas, Las Vegas, NV, USA;3. School of Health Professions, Texas Tech University Health Sciences Center, Lubbock, TX, USA;4. Department of Human Physiology, University of Oregon, Eugene, OR, USA |
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| Abstract: | Our purpose was to use group and single-case methods to examine inter-individual variability in the context of factors related to landing injuries. We tested the load accommodation strategies model (An exploration of load accommodation strategies during walking with extremity-carried weights. Human Movement Science, 35, 17–29) using landing impulse, revealing pre-landing strategies following height and external load manipulations. Ten healthy volunteers (8 male, 2 female, 24.0 ± 1.4 years, 1.72 ± 0.06 m, 73.5 ± 8.7 kg) were analysed across 12 trials in each of three load conditions (100% body weight BW], 110% BW, 120% BW) from two landing heights (30 cm, 60 cm). Landing impulse (BW ? s) was computed for each participant-condition-trial, using impulse ratios (unit-less; BW ? s/BW ? s) to evaluate load accommodation strategies between adjacent load conditions (110%/100%, 120%/110%) at each landing height. Load accommodation strategy classifications were based on 95% confidence intervals (CIs) containing mechanically predicted impulse ratios (1.10 and 1.09 for 110/100% BW and 120/110% BW, respectively; α = 0.05). Mean group impulse ratios matched and exceeded predicted impulse ratios. Single-case analyses revealed a range of individual landing strategies that might be overlooked during group analyses, possibly uncovering individuals at greater risk of injury during landing activities. |
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| Keywords: | Variability single-case impulse load height |
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