Comparative study of the differences in shoulder muscle activation according to arm rotation angle

Ijiri, Tomohito; Urabe, Yukio; Maeda, Noriaki; Sasadai, Junpei; Suzuki, Toshiaki

doi:10.1016/j.humov.2019.102567

Cited by 7 publications

(6 citation statements)

References 43 publications

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“…Flow cytometric analysis of samples was performed in all COVID-19 patients (days 1–3, 4–7, 8–11, and 12–15) and in CINS patients (days 1–3) as previously described ( 33 , 34 ). ALC was profoundly depressed in COVID-19 patients over the entire duration of the study compared with nonseptic patients (first comparison days 1–3; P = 0.01) ( Figure 7A ).…”

Section: Resultsmentioning

confidence: 99%

“…For example, anti-IL-6(R) antibodies, IL-1 receptor antagonists, and JAK/STAT inhibitors are currently undergoing clinical testing in patients with COVID-19 (27)(28)(29)(30)(31)(32) and carry the potential to further compromise the patient's ability to eradicate the virus. Conversely, treatment with immune stimulants such as checkpoint inhibitors, IL-7, IFN-γ, and GM-CSF, currently either proposed or in active clinical trials in COVID-19 (15,33), could exacerbate a dysfunctional and robust inflammatory response and worsen organ injury.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Severe immunosuppression and not a cytokine storm characterizes COVID-19 infections

Remy¹,

Mazer²,

Striker³

et al. 2020

JCI Insight

274

303

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Severe immunosuppression and not a cytokine storm characterizes COVID-19 infections

Remy¹,

Mazer²,

Striker³

et al. 2020

JCI Insight

274

303

View full text Add to dashboard Cite

“…The internal rotation of the shoulder mainly involves the anterior deltoid (DA), the pectoralis major (PM), the latissimus dorsi, and the teres minor (TM), while the external rotation involves the infraspinatus (INF), the teres minor (TM), and the posterior deltoid (DP). The energy of inner rotation is much higher than that of outer rotation (Ijiri et al, 2020). The biceps brachii (short/long head) can be used as a supinator muscle, where the biceps play a role in the activity of medium or high-power supination.…”

Section: Acquisition Detailsmentioning

confidence: 99%

Muscle synergies in joystick manipulation

Cai,

Yan,

Ouyang

et al. 2023

Front. Physiol.

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Extracting muscle synergies from surface electromyographic signals (sEMGs) during exercises has been widely applied to evaluate motor control strategies. This study explores the relationship between upper-limb muscle synergies and the performance of joystick manipulation tasks. Seventy-seven subjects, divided into three classes according to their maneuvering experience, were recruited to perform the left and right reciprocation of the joystick. Based on the motion encoder data, their manipulation performance was evaluated by the mean error, standard deviation, and extreme range of position of the joystick. Meanwhile, sEMG and acceleration signals from the upper limbs corresponding to the entire trial were collected. Muscle synergies were extracted from each subject’s sEMG data by non-negative matrix factorization (NMF), based on which the synergy coordination index (SCI), which indicates the size of the synergy space and the variability of the center of activity (CoA), evaluated the temporal activation variability. The synergy pattern space and CoA of all participants were calculated within each class to analyze the correlation between the variability of muscle synergies and the manipulation performance metrics. The correlation level of each class was further compared. The experimental results evidenced a positive correlation between manipulation performance and maneuvering experience. Similar muscle synergy patterns were reflected between the three classes and the structure of the muscle synergies showed stability. In the class of rich maneuvering experience, the correlation between manipulation performance metrics and muscle synergy is more significant than in the classes of trainees and newbies, suggesting that long-term training and practicing can improve manipulation performance, stability of synergy compositions, and temporal activation variability but not alter the structure of muscle synergies determined by a specific task. Our approaches and findings could be applied to 1) reduce manipulation errors, 2) assist maneuvering training and evaluation to enhance transportation safety, and 3) design technical support for sports.

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“…Arm dominance was determined by the arm used for writing. The electrodes were positioned according to previous studies [24,25], and the detailed position of each muscle is presented in Table 1. The distance between the electrodes was a minimum of 2 cm.…”

Section: Outcome Measurementmentioning

confidence: 99%

Effects of Pseudo-Weight Resistance Training Using Mixed-Reality Technology on Muscle Activation in Healthy Adults: A Preliminary Study

Nekar,

Lee,

Hong

et al. 2023

Applied Sciences

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The present study investigated the feasibility and effectiveness of pseudo-weight resistance training using mixed-reality (MR) technology for shoulder muscle activation in healthy individuals. Thirty-two healthy students aged 20~35 years participated in this preliminary study and were divided into two groups. Participants in the MR group received 30 min of training three times a week for 4 weeks using a customized MR-based pseudo-weight resistance training system. Those in the control group performed the same exercises using a conventional training program. Muscle activation of the deltoids, upper trapezius, infraspinatus, and supraspinatus were measured before and after the intervention. There was a statistically significant difference in middle deltoid, upper trapezius, and supraspinatus muscle activation in the MR group (p < 0.05), while the control group showed a significant difference in the anterior and middle deltoid, upper trapezius, and supraspinatus (p < 0.05). Regarding the between-group comparison, no statistically significant difference was observed for all six muscles (p > 0.05). Without any superiority of physical weight resistance training in the pseudo-weight training program, an MR-based pseudo-weight resistance training system can potentially be used for muscle-strengthening training, especially for early rehabilitation programs. However, further study using a large sample size with a long experimental duration is needed for more evidence of the presented technology and its use in home training.

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Comparative study of the differences in shoulder muscle activation according to arm rotation angle

Cited by 7 publications

References 43 publications

Severe immunosuppression and not a cytokine storm characterizes COVID-19 infections

Severe immunosuppression and not a cytokine storm characterizes COVID-19 infections

Muscle synergies in joystick manipulation

Effects of Pseudo-Weight Resistance Training Using Mixed-Reality Technology on Muscle Activation in Healthy Adults: A Preliminary Study

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