Muscle synergy structure using different strategies in human standing-up motion

Yang, Ningjia; An, Qi; Yamakawa, Hiroshi; Tamura, Yusuke; Yamashita, Atsushi; Asama, Hajime

doi:10.1080/01691864.2016.1238781

Cited by 27 publications

(13 citation statements)

References 21 publications

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“…Similar to our previous study (Yang et al, 2017), in which different strategies of the sit-to-stand motion were investigated, and to another study (Ivanenko et al, 2005), in which human locomotion was analyzed, the spatial patterns of muscle synergies were found to be similar. It was also reported recently (Takei et al, 2017; Desrochers et al, 2018) that this muscle coordination is coded in the spinal cord and is unchanged.…”

Section: Discussionsupporting

confidence: 86%

“…These results imply that various movements can be explained using a relatively small number of modules, such as muscle synergies. Our group analyzed muscle activation in human sit-to-stand motion, demonstrated that there are four muscle synergies in the sit-to-stand motion of humans (An et al, 2015), and found that the activation timing of these synergies differs with age (Yang et al, 2017). It was suggested that muscle synergy is controlled by a feedforward signal and sensory feedback (Cheung et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Visual and Vestibular Inputs Affect Muscle Synergies Responsible for Body Extension and Stabilization in Sit-to-Stand Motion

Yoshida

Yozu

et al. 2019

Front. Neurosci.

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The sit-to-stand motion is a common movement in daily life and understanding the mechanism of the sit-to-stand motion is important. Our previous study shows that four muscle synergies can characterize the sit-to-stand motion, and they have specific roles, such as upper body flexion, rising from a chair, body extension, and posture stabilization. The time-varying weight of these synergies are changed to achieve adaptive movement. However, the relationship between sensory input and the activation of the muscle synergies is not completely understood. In this paper, we aim to clarify how vestibular and visual inputs affect the muscle synergy in sit-to-stand motion. To address this, we conducted experiments as follows. Muscle activity, body kinematics, and ground reaction force were measured for the sit-to-stand motion under three different conditions: control, visual-disturbance, and vestibular-disturbance conditions. Under the control condition, the participants stood without any intervention. Under the visual-disturbance condition, the participants wore convex lens glasses and performed the sit-to-stand motion in a dark room. Under the vestibular-disturbance condition, a caloric test was performed. Muscle synergies were calculated for these three conditions using non-negative matrix factorization. We examined whether the same four muscle synergies were employed under each condition, and the changes in the time-varying coefficients were determined. These experiments were conducted on seven healthy, young participants. It was found that four muscle synergies could explain the muscle activity in the sit-to-stand motion under the three conditions. However, there were significant differences in the time-varying weight coefficients. When the visual input was disturbed, a larger amplitude was found for the muscle synergy that activated mostly in the final posture stabilization phase of the sit-to-stand motion. Under vestibular-disturbance condition, a longer activation was observed for the synergies that extended the entire body and led to posture stabilization. The results implied that during human sit-to-stand motion, visual input has less contribution to alter or correct activation of muscle synergies until the last phase. On the other hand, duration of muscle synergies after the buttocks leave are prolonged in order to adapt to the unstable condition in which sense of verticality is decreased under vestibular-disturbance.

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Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Visual and Vestibular Inputs Affect Muscle Synergies Responsible for Body Extension and Stabilization in Sit-to-Stand Motion

Yoshida

Yozu

et al. 2019

Front. Neurosci.

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“…STS and the stand to sit are essential and basic functional movements for the performance of daily life, and not only workers of various occupations, but also LBP patients repeat these movements dozens of times a day for their job and daily life performances [ 13 , 39 ]. STS can be approached in three ways: using momentum to lift the center of mass (COM), a stabilization strategy that first shifts the COM forward using the feet and lifts it, and a hybrid strategy that falls in between the two aforementioned approaches [ 40 ]. It is difficult for LBP patients, who have limited ROM of the LS and hip, to use the stabilization strategy, as it requires adequate ROM in the LS [ 33 ].…”

Section: Discussionmentioning

confidence: 99%

The Effectiveness of Trunk Stabilization Exercise Combined with Vibration for Adolescent Patients with Nonspecific Low Back Pain

Jung

et al. 2020

IJERPH

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There are many adolescent patients complaining of low back pain, but research on it is lacking. The purpose of this study was to investigate the effects of trunk stabilization exercise combined with vibration on the pain, proprioception, and kinematics of the lumbar spine (LS) during sit to stand (STS) in adolescent patients with nonspecific low back pain (LBP). Fifty LBP patients were recruited and were randomly divided into two groups: Vibration group (n = 25) and placebo group (n = 25). All participants underwent 36-sessions of training consisting of six exercises. The Vibration group provided vibration stimulation during exercise, but the placebo group did not. The Numeric Pain Rating Scale (NPRS) and digital dual inclinometer were used to measure pain intensity and proprioception. The kinematics of the lumbar spine during STS were measured by motion capture system. After training, the pain and proprioception in the vibration group improved significantly greater than the placebo group (p < 0.05). The mobility of LS (maximum range of motion, angular velocity, lumbar to hip movement ratios) and lumbar-hip coordination during STS in the vibration group were significantly improved compared to the placebo group (p < 0.05). Thus, trunk stabilization exercise combined with vibration may be used to improve the pain, proprioception, and kinematic of the lumbar spine during sit to stand in adolescent patients with LBP.

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“…In addition, our previous study revealed that humans change the duration of muscle synergy to realize adaptive STS motion when their sensory information is impaired [32]. Then, the peak time was selected because our previous study found that the peak time affects STS strategies in healthy adults [24]. Therefore, we suggested the peak time might also affect the STS of post-stroke patients.…”

Section: E Muscle Synergy Featuresmentioning

confidence: 99%

“…Although there are many studies regarding muscle synergies in human locomotion in patients with motor impairment, it is [18] and experimental measurement [24] to clarify the muscle synergy structure in healthy young adults. In the present study, we first recorded the muscle activation data from post-stroke patients with different severities and from a subgroup of age-matched healthy controls, and then extracted the muscle synergies.…”

mentioning

confidence: 99%

Temporal Features of Muscle Synergies in Sit-to-Stand Motion Reflect the Motor Impairment of Post-Stroke Patients

Yang

Kogami

et al. 2019

IEEE Trans. Neural Syst. Rehabil. Eng.

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Sit-to-stand (STS) motion is an important daily activity, and many post-stroke patients have difficulty performing STS motion. Previous studies found that there are four muscle synergies (synchronized muscle activations) in the STS motion of healthy adults. However, for post-stroke patients, it is unclear whether muscle synergies change and which features primarily reflect motor impairment. Here, we use a machine learning method to demonstrate that temporal features in two muscle synergies that contribute to hip rising and balance maintenance motion reflect the motor impairment of post-stroke patients. Analyzing the muscle synergies of age-matched healthy elderly people (n = 12) and post-stroke patients (n = 33), we found that the same four muscle synergies could account for the muscle activity of post-stroke patients. Also, we were able to distinguish post-stroke patients from healthy people on the basis of the temporal features of these muscle synergies. Furthermore, these temporal features were found to correlate with motor impairment of post-stroke patients. We conclude that poststroke patients can still utilize the same number of muscle synergies as healthy people, but the temporal structure of muscle synergies changes as a result of motor impairment. This could lead to a new rehabilitation strategy for poststroke patients that focuses on activation timing of muscle synergies.

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Muscle synergy structure using different strategies in human standing-up motion

Cited by 27 publications

References 21 publications

Visual and Vestibular Inputs Affect Muscle Synergies Responsible for Body Extension and Stabilization in Sit-to-Stand Motion

Visual and Vestibular Inputs Affect Muscle Synergies Responsible for Body Extension and Stabilization in Sit-to-Stand Motion

The Effectiveness of Trunk Stabilization Exercise Combined with Vibration for Adolescent Patients with Nonspecific Low Back Pain

Temporal Features of Muscle Synergies in Sit-to-Stand Motion Reflect the Motor Impairment of Post-Stroke Patients

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