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Can stabilization analysis following a single leg drop jump be compared between young and middle-aged adults
Roee Hayek1, Uri Gottlieb1, Itai Gutman1
1Faculty of Health Sciences, Department of Physical Therapy, The Neuromuscular & Human Performance Laboratory, Ariel University, Ariel, Israel.
Journal of Biomechanics
|September 1, 2022
Summary
Computational methods for analyzing single-leg drop-jump (SLDJ) stability are applicable to middle-aged adults. Middle-aged individuals exhibit decreased dynamic postural stability, particularly in late-phase stabilization, when appropriate analysis methods are used.
Area of Science:
- Biomechanics
- Gerontology
- Sports Science
Background:
- Assessing dynamic postural stability is crucial for understanding functional performance across the lifespan.
- Previous computational methods for analyzing single-leg drop-jump (SLDJ) stability were primarily validated in younger populations.
- Aging is associated with changes in neuromuscular control and balance, potentially impacting post-landing stability.
Purpose of the Study:
- To evaluate the applicability of existing computational approaches for analyzing SLDJ stability in middle-aged adults.
- To compare dynamic postural stability between middle-aged and young adults using various stabilization metrics.
- To identify the most appropriate computational methods for assessing stability in middle-aged populations.
Main Methods:
- Fifteen middle-aged (56.4 ± 4.6 years) and 15 young adults (26.7 ± 3.9 years) performed five SLDJs.
- Measurements included time to stabilization (TTS) derived from vertical (TTSv) and mediolateral (TTSml) ground reaction forces (GRF).
- Various signal processing techniques and stabilization thresholds were applied to TTSml; early and late medio-lateral stabilization were also assessed.
Main Results:
- Middle-aged adults demonstrated significantly longer TTSv and greater late-phase medio-lateral sway compared to young adults.
- TTSml results were highly dependent on the chosen signal processing methods and threshold.
- Early medio-lateral stabilization showed no significant group differences, except within the initial 0.2 seconds post-landing.
Conclusions:
- Computational methods for analyzing SLDJ stability can be adapted for middle-aged adults, but are sensitive to signal processing and threshold selection.
- Fixed threshold calculations for TTSv are recommended for studying dynamic postural stability in middle age.
- With appropriate methodological choices, reduced stabilizing performance can be identified in middle-aged compared to young adults.
