The Effects of Conscious Movement Processing on the Neuromuscular Control of Posture

Autor: Li-Juan Jie, Elmar Kal, Toby J. Ellmers, Joëlle Rosier, Kenneth Meijer, Tjeerd Boonstra
Přispěvatelé: RS: NUTRIM - R3 - Respiratory & Age-related Health, Nutrition and Movement Sciences, Section Neuropsychology, RS: FPN NPPP I
Rok vydání: 2022
Předmět:
Zdroj: Neuroscience
Neuroscience, 509, 63-73. Elsevier Science
ISSN: 1873-7544
0306-4522
Popis: Preprint - bioRxiv posts many COVID19-related papers. A reminder: they have not been formally peer-reviewed and should not guide health-related behavior or be reported in the press as conclusive. Maintaining balance typically occurs sub-consciously. Occasionally, however, individuals will direct conscious attention towards balance, e.g., in response to a postural threat. Such conscious movement processing (CMP) increases the reliance on attentional resources and may disrupt control of balance, but the underlying changes in neuromuscular control remain poorly understood. We investigated the effects of CMP (manipulated using verbal instructions) on neural control of posture in twenty-five adults (11 females, mean age = 23.9, range = 18–33). Participants performed 90-second, narrow-stance balance trials in high- and low-CMP conditions, and in stable (solid surface) and unstable (foam) task conditions. Postural sway amplitude, frequency and complexity were used to assess postural control. Surface EMG was recorded bilaterally from lower leg muscles (Soleus, Tibialis Anterior, Gastrocnemius Medialis, Peroneus Longus) and intermuscular coherence (IMC) was assessed for 12 muscle pairs across four frequency bands. We found significantly increased sway amplitude, and decreased sway frequency and complexity in the high- compared to the low-CMP condition. All sway variables (frequency, amplitude and complexity) increased in the unstable compared to the stable condition. Results suggested reduced beta band IMC between several muscles pairs during high- compared to low-CMP, but these findings did not remain significant after controlling for multiple comparisons. Finally, IMC significantly increased in the unstable conditions for most muscle combinations and frequency bands. In all, results tentatively suggest that CMP-induced changes in sway outcomes may be underpinned by reduced beta-band IMC, but these findings need to be replicated before they can be interpreted more conclusively. Funding: LJ was funded by the Kootstra Talent Fellowship awarded by Maastricht UMC+
Databáze: OpenAIRE
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