Basic locomotor muscle synergies used in land walking are finely tuned during underwater walking

Yokoyama, Haruki; Kato, Toshiya; Kaneko, Norio; Kobayashi, Hirofumi; Hoshino, Motonori; Kokubun, Takanori; Nakazawa, Kimitaka

doi:10.1038/s41598-021-98022-8

Cited by 27 publications

(25 citation statements)

References 51 publications

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“…The modular organization of the locomotor network controlling swimming speed was demonstrated in adult zebrafish (Ampatzis et al, 2014). Several findings in mice (Talpalar et al, 2013;Rancic et al, 2020;Falgairolle and O'Donovan, 2021;Zelenin et al, 2021), cats (Krouchev et al, 2006;Desrochers et al, 2019), and humans (Huang et al, 2021;Yokoyama et al, 2021) also point to the modular organization of the network generating different locomotor patterns.…”

Section: Discussionmentioning

confidence: 89%

Activity of Spinal Interneurons during Forward and Backward Locomotion

et al. 2022

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Higher vertebrates are capable not only of forward but also backward and sideways locomotion. Also, single steps in different directions are generated for postural corrections. While the networks responsible for the control of forward walking (FW) have been studied in considerable detail, the networks controlling steps in other directions are mostly unknown. Here, to characterize the operation of the spinal locomotor network during FW and backward walking (BW), we recorded the activity of individual spinal interneurons from L4 to L6 during both FW and BW evoked by epidural stimulation (ES) of the spinal cord at L5-L6 in decerebrate cats of either sex. Three groups of neurons were revealed. Group 1 (45%) had a similar phase of modulation during both FW and BW. Group 2 (27%) changed the phase of modulation in the locomotor cycle depending on the direction of locomotion. Group 3 neurons were modulated during FW only (Group 3a, 21%) or during BW only (Group 3b, 7%). We suggest that Group 1 neurons belong to the network generating the vertical component of steps (the limb elevation and lowering) because it should operate similarly during locomotion in any direction, while Groups 2 and 3 neurons belong to the networks controlling the direction of stepping. Results of this study provide new insights into the organization of the spinal locomotor circuits, advance our understanding of ES therapeutic effects, and can potentially be used for the development of novel strategies for recuperation of impaired balance control, which requires the generation of corrective steps in different directions.

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Section: Discussionmentioning

confidence: 89%

Activity of Spinal Interneurons during Forward and Backward Locomotion

et al. 2022

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“…As mentioned earlier, water has been established to have a soothing and relaxing effect. Based on a study conducted by Yokoyama et al, (2021) [26] pain is a contributing factor to the slow treatment of patients with locomotive difficulties. It can therefore be complex to assess the real degree of injuries or the actual level of a medical condition if a patient's ability to show actual developments is inhibited by pain.…”

Section: Resultsmentioning

confidence: 99%

Suicidal behavior among Iranian psychiatric patients

Chandolias¹,

Stefanouli²,

Tsokani³

et al. 2022

Int. J. Adv. Res. Med.

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Introduction: Surface electromyography (sEMG) equipment technological advancements are opening more and more new options for the use of this technology in many medical areas and rehabilitation, including physiotherapy on land and in the water environment. Objective: The purpose of this study is to investigate the use of electromyography (EMG) wearable sensors in hydro-rehabilitation and to analyze the use of surface electromyography in the rehabilitation of various diseases on land and in the water environment Methods: Studies were searched for on the Pub-Med, Science direct, and Google Scholar databases using the following descriptors: "sEMG rehabilitation", "sEMG physiotherapy", "surface electromyography physiotherapy", "sEMG hydrotherapy", resulting in 57,200 citations in total. After reviewing for inclusion criteria -methodological quality assessment using the Physiotherapy Evidence Database (PEDro) scale and consistency with the theme of systematic review -152 studies remained in the analysis. Results: A total of 153 articles were found in 3 databases searched, only 30 were included and classified with good methodological quality by Pedro because they were related to surface electromyography, physiotherapy on land and hydrotherapy. Conclusion:The role of EMG sensors to measure muscle activity is extremely important for the physiotherapist to monitor and evaluate the clinical process and the effectiveness of hydrorehabilitation as a treatment method. More research is needed in order to find a functional and reliable way of use.

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“…Because NMF utilizes the random initialization of W and C, the algorithm may have been stuck in a suboptimal local minimum. Thus, each synergy extraction was repeated 50 times and the iteration with the highest VAF was maintained 9,33,39,40 . In this study, we extracted trunk muscle synergies from all-task EMG matrices.…”

Section: Muscle Synergy Analysismentioning

confidence: 99%

“…Using the criteria, we extracted trunk-related muscle synergies with the mean number 5.13 ± 0.83 (mean ± standard deviations [SD]). To facilitate the comparison of participants and assess the inter-session variability of trunk muscle synergies, we used the same number of muscle synergies as the rounded mean number of synergies across participants, that is, ve extracted from all-task EMG matrices for further analyses 39,47 .…”

Section: Muscle Synergy Analysismentioning

confidence: 99%

Variability of trunk muscle synergies underlying the multidirectional movements and stability trunk motor tasks in healthy individuals

Saito

Yokoyama

Sasaki

et al. 2022

Preprint

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Muscle synergy analysis is a useful approach for investigating the nature of trunk coordination patterns based on the assumption that the central nervous system reduces the dimensionality of muscle activation to simplify movement. This study aimed to quantify the variability in trunk muscle synergy during 11 trunk motor tasks in healthy participants to provide reference data for evaluating trunk control strategies in patients and athletes. Even in a highly variable task context, the five trunk muscle synergies with their temporal patterns presented well-reconstructed original electromyography data. While the variability in trunk synergies between participants and sessions were comparable to those for other body parts in previous studies, these metrics had a broad range, reflecting some level of redundancy of the musculoskeletal system in healthy individuals. Furthermore, the significant differences in the degree of variability between the trunk synergies may reflect the different neural features of trunk synergy organization and strategies to overcome the various mechanical demands of a motor task. The quantification of the variability of trunk muscle synergy may guide the assessment of stereotypes or diverse features of trunk control strategies and the interpretation of adaptability in the presence of diseases or the process of motor training in future research.

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Basic locomotor muscle synergies used in land walking are finely tuned during underwater walking

Cited by 27 publications

References 51 publications

Activity of Spinal Interneurons during Forward and Backward Locomotion

Activity of Spinal Interneurons during Forward and Backward Locomotion

Suicidal behavior among Iranian psychiatric patients

Variability of trunk muscle synergies underlying the multidirectional movements and stability trunk motor tasks in healthy individuals

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