Single-subject analysis reveals variation in knee mechanics during step landing

Scholes, Corey J., McDonald, Michael D., & Parker, Tony W. (2012) Single-subject analysis reveals variation in knee mechanics during step landing. In Butler, Bianca, Tucker, Kylie, & Hodges, Paul (Eds.) Proceedings of the XIX Biennial Congress of the International society of electrophysiology and kinesiology, The University of Queensland, Brisbane Convention and Exhibition Centre, Brisbane, QLD.

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Introduction: Evidence concerning the alteration of knee function during landing suffers from a lack of consensus. This uncertainty can be attributed to methodological flaws, particularly in relation to the statistical analysis of variable human movement data.

Aim: The aim of this study was to compare single-subject and group analysis in quantifying alterations in the magnitude and within-participant variability of knee mechanics during a step landing task.

Methods: A group of healthy men (N = 12) stepped-down from a knee-high platform for 60 consecutive trials, each trial separated by a 1-minute rest. The magnitude and within-participant variability of sagittal knee stiffness and coordination of the landing leg during the immediate postimpact period were evaluated. Coordination of the knee was quantified in the sagittal plane by calculating the mean absolute relative phase of sagittal shank and thigh motion (MARP1) and between knee rotation and knee flexion (MARP2). Changes across trials were compared between both group and single-subject statistical analyses.

Results: The group analysis detected significant reductions in MARP1 magnitude. However, the single-subject analyses detected changes in all dependent variables, which included increases in variability with task repetition. Between-individual variation was also present in the timing, size and direction of alterations to task repetition.

Conclusion: The results have important implications for the interpretation of existing information regarding the adaptation of knee mechanics to interventions such as fatigue, footwear or landing height. It is proposed that a familiarisation session be incorporated in future experiments on a single-subject basis prior to an intervention.

Impact and interest:

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ID Code: 52898
Item Type: Conference Paper
Refereed: Yes
Keywords: Biomechanics, step landing, load attenuation, force, knee
ISBN: 9780646582283
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > HUMAN MOVEMENT AND SPORTS SCIENCE (110600) > Biomechanics (110601)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Deposited On: 02 Aug 2012 22:51
Last Modified: 24 Jun 2017 14:35

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