Differences in muscle synergies among recovery responses limit inter-task generalisation of stability performance

Journal article


Koenig, M., Santuz, A., Epro, G., Werth, J., Arampatzis, A. and Karamanidis, K. (2022). Differences in muscle synergies among recovery responses limit inter-task generalisation of stability performance. Human Movement Science. 82, p. 102937. https://doi.org/10.1016/j.humov.2022.102937
AuthorsKoenig, M., Santuz, A., Epro, G., Werth, J., Arampatzis, A. and Karamanidis, K.
Abstract

Generalisation of adaptations is key to effective stability control facing variety of postural threats during daily life activity. However, in a previous study we could demonstrate that adaptations to stability control do not necessarily transfer to an untrained motor task. Here, we examined the dynamic stability and modular organisation of motor responses to different perturbations (i.e. unpredictable gait-trip perturbations and subsequent loss of anterior stability in a lean-and-release protocol) in a group of young and middle-aged adults (n = 57; age range 19–53 years) to detect potential neuromotor factors limiting transfer of adaptations within the stability control system. We hypothesized that the motor system uses different modular organisation in recovery responses to tripping and lean-and-release, which may explain lack in positive transfer of adaptations in stability control. After eight trip-perturbations participants increased their dynamic stability during the first recovery step (p < 0.001), yet they showed no significant improvement to the untrained lean-and-release transfer task compared to controls who did not undergo the perturbation exposure (p = 0.44). Regarding the neuromuscular control of responses, lower number of synergies (3 vs. 4) was found for the lean-and-release compared to the gait-trip perturbation task, revealing profound differences in both the timing and function of the recruited muscles to match the biomechanical specificity of different perturbations. Our results provide indirect evidence that the motor system uses different modular organisation in diverse perturbation responses, what possibly inhibits inter-task generalisation of adaptations in stability control.

KeywordsLocomotion; Muscle synergy; Perturbation training; Dynamic stability; Motor control
Year2022
JournalHuman Movement Science
Journal citation82, p. 102937
PublisherElsevier
ISSN0167-9457
Digital Object Identifier (DOI)https://doi.org/10.1016/j.humov.2022.102937
Web address (URL)https://www.sciencedirect.com/science/article/pii/S0167945722000173?via%3Dihub
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PrintApr 2022
Online23 Feb 2022
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Accepted13 Feb 2022
Deposited25 Feb 2022
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