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Published on: July 26, 2022
Contribution of arm swing to dynamic stability based on the nonlinear time series analysis method
Fei Hu1, Dong-Yun Gu, Jin-Ling Chen
1Engineering Research Center of Digital Medicine and Clinical Translation, Ministry of Education, and Biomedical Engineering School of Shanghai Jiaotong University, Shanghai 200030, China.
Summary
Active arm swing enhances dynamic stability in the spine and lower extremity joints during walking. This effect is more pronounced in middle-aged individuals compared to younger adults, suggesting improved human gait stability with age.
Area of Science:
- Biomechanics
- Human Gait Analysis
- Dynamic Stability
Background:
- Arm swing during walking is a natural human motion, but its precise contribution to dynamic stability remains unclear.
- Understanding the role of arm swing is crucial for assessing the stability of the spine and lower extremity joints during locomotion.
- Investigating age-related differences in the effectiveness of arm swing on dynamic stability is important for understanding human movement.
Purpose of the Study:
- To investigate the effects of natural, active, and restricted arm swing on the dynamic stability of the spine and lower extremity joints.
- To assess the contribution of arm swing to human dynamic stability, considering age-related variations.
- To quantify local dynamic stability using nonlinear time series analysis.
Main Methods:
- Gait experiments were conducted on young and middle-aged healthy volunteers.
- Participants walked under three arm swing conditions: natural, active, and restricted.
- Maximum finite time Lyapunov exponents were calculated to quantify local dynamic stability of key body segments.
Main Results:
- No significant difference in dynamic stability was observed between natural and restricted arm swing conditions for both age groups.
- Active arm swing significantly improved dynamic stability across all measured motion segments compared to natural and restricted conditions.
- The improvement in dynamic stability from active arm swing was significantly greater in the middle-aged group than in the young group.
Conclusions:
- Active arm swing enhances the dynamic stability of human motion segments, particularly the spine and lower extremity joints.
- Active arm swing is a more effective strategy for improving gait stability in middle-aged individuals compared to younger adults.
- These findings highlight the importance of arm swing in maintaining human dynamic stability, with implications for age-related movement strategies.
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