Muscle synergy analysis during the sit-to-stand movement in elderly individuals with a history of falling

doi:10.13418/j.issn.1001-165x.2024.2.14

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Chinese Journal of Clinical Anatomy ›› 2024, Vol. 42 ›› Issue (2) : 196-200. DOI: 10.13418/j.issn.1001-165x.2024.2.14

Muscle synergy analysis during the sit-to-stand movement in elderly individuals with a history of falling

Liu Ruiping^1,2, Qian Lei², Liu Yanyan ^2,3, Wan Xinzhu², Chen Chunyan², Wang Yining², Yu Wanqi², Ouyang Jun²*

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Abstract

Objective To explore the change of muscle recruitment mechanisms during sit-to-stand (STS) movements in elderly individuals with a history of falls. Methods A total of 17 healthy young adults, 17 healthy elderly adults, and 9 elderly individuals with a history of falls were recruited. Surface electromyography (sEMG) signals and the trajectory of the center of pressure (COP) from 16 muscles of the right lower limb were collected. Falls Efficacy Scale-International (FES-I) was used to assess fall risk, and muscle synergies were extracted by non-negative matrix factorization (NNMF). Results There was no significant difference in the number of muscle synergies among the three groups. In the elderly individuals with a history of falls, early activation of the hamstring and ankle plantar flexors at the beginning of sit-to-stand movement was transformed into additional muscle activity at the later stage of movement, in contrast to the healthy group. Furthermore, COP offsets and FES-I scores were significantly increased, indicating a lack of movement stability. Conclusions Abnormal activation of hamstrings and ankle dorsiflexion in elderly individuals with a history of falls during STS movements may affect lower limb stability and changes in muscle recruitment strategies.

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Falls / / / Sit-to-stand exercise / / / Muscle synergy / / / Surface electromyography

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Liu Ruiping, Qian Lei, Liu Yanyan, Wan Xinzhu, Chen Chunyan, Wang Yining, Yu Wanqi, Ouyang Jun. Muscle synergy analysis during the sit-to-stand movement in elderly individuals with a history of falling[J]. Chinese Journal of Clinical Anatomy. 2024, 42(2): 196-200 https://doi.org/10.13418/j.issn.1001-165x.2024.2.14

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