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Electromyographic responses to unexpected Achilles tendon vibration-induced perturbations during standing in young and older people

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Abstract

This study aimed to investigate age-related differences in electromyographic (EMG) responses to unexpected Achilles tendon vibration (ATV) perturbations while standing blindfold. ATV with variable and random duration (12–15 s) and rest periods (20–24 s) was applied on 18 young and 16 older volunteers. The anterior/posterior center of pressure (CoP) and the soleus (SOL) and tibialis anterior (TA) EMG were analyzed for 1 s before and 8 s after the ATV onset and offset. ATV induced a posterior shift of CoP in both groups, with more pronounced shift in the older group. During ATV onset, the older group demonstrated less SOL and more TA EMG increase compared to the young group. During the first 0.5 s of ATV offset, SOL EMG was decreased in both age groups, while TA showed a burst of EMG activity that was greater in the older group. No difference in the latencies of EMG peaks or valleys was observed between the groups. It is concluded that ATV induces greater posterior CoP shift in older adults, and they adopt a recovery strategy, characterized by a decreased SOL activation and an increased TA activation. These differences are possibly attributed to the increased fear of falling, decreased limits of stability and reduced capacity of older people to reweight their sensory inflow when proprioception is distorted.

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Acknowledgements

This work was supported by a grant from the State Scholarships Foundation of Greece. The authors are grateful to Dimitris Petrakis for his contribution to the measurements of this study and all the volunteers who kindly participated.

Funding

This study was supported by a grant from the State Scholarships Foundation of Greece (Grant number: MIS 5000432/11405. Grand Recipient: Anastasia Papavasileiou).

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Authors and Affiliations

Authors

Contributions

AP carried out the experiment and wrote the first draft. AP and DP conceived the main idea, designed research protocol, assessed the data analysis. DP, VH and LM supervised the experiment. VH contributed to the materials required to assess the experiment. All authors revised / edited the manuscript and approved its final version.

Corresponding author

Correspondence to Dimitrios A. Patikas.

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Conflict of interest

The authors declare that there is no conflict of interest.

Ethical approval

The experiment was performed in accordance with the Declaration of Helsinki and was approved from the ethics committee of the Aristotle University of Thessaloniki (approval code: 18424/2019).

Consent to participate

All the participants voluntarily agreed to participate in this research study.

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Communicated by John G. Semmler.

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Papavasileiou, A., Mademli, L., Hatzitaki, V. et al. Electromyographic responses to unexpected Achilles tendon vibration-induced perturbations during standing in young and older people. Exp Brain Res 240, 1017–1027 (2022). https://doi.org/10.1007/s00221-022-06309-7

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  • DOI: https://doi.org/10.1007/s00221-022-06309-7

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