Journal of Electromyography and Kinesiology最新文献

{"title":"Inter-session Reliability of Magnetic Nerve Stimulation and Within-Session comparison to Electrical Nerve Stimulation in Evaluating Neuromuscular Function of Knee Extensor Muscles.","authors":"Romina Ledergerber, Martin Keller","doi":"10.1016/j.jelekin.2024.102964","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102964","url":null,"abstract":"<p><p>The Interpolated Twitch Technique with electrical nerve stimulation (ENS) is the considered gold-standard to assess voluntary activation (VA) but causes discomfort. Magnetic nerve stimulation (MNS) offers a painless alternative, though its validity and reliability remain underexplored. This study validates MNS to ENS and evaluates inter-session reliability in 16 healthy young adults (11 females). Data on resting single twitches (RS), superimposed doublets (ST) during maximal voluntary contractions, and resting double twitches (RT) were assessed using both MNS and ENS, alongside discomfort ratings (VAS). Intraclass correlation (ICC), coefficient of variation (CV) and mean absolute percentage error (MAPE) were used to quantify agreement between stimulations and/or inter-session reliability. Strong agreement between MNS and ENS was found for RS, RT, and VA (ICC = 0.77-0.88), with MAPE values of 4.4 % (VA) and 9.5 % (RT). Discomfort was lower for MNS (VAS = 1.0 ± 0.9) than ENS (VAS = 1.9 ± 1.1). Intersession-reliability for MNS was good (ICC = 0.78-0.95) with low CV for VA (4.9 %) but high for RS, RT and ST (61.7 %, 28.9 %, 82.0 %). Based on these results, MNS provides a valid, reliable, and painless alternative to ENS for assessing VA in knee extensor muscles. However, individual evoked twitches varied across methods and sessions, warranting caution when interpreting absolute values.</p>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"102964"},"PeriodicalIF":2.0,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of tasks on intramuscular regional differences in rectus femoris elasticity during isometric contraction: An ultrasound shear wave elastography study.","authors":"Taiki Kodesho, Kazuma Yamagata, Gakuto Nakao, Masaki Katayose, Keigo Taniguchi","doi":"10.1016/j.jelekin.2024.102967","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102967","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to investigate intramuscular regional differences and task specificity of rectus femoris (RF) elasticity during isometric contraction.</p><p><strong>Methods: </strong>Sixteen healthy males (aged 24.3 ± 4.1 years) participated in this study. The tasks included isometric hip flexion (HF) and knee extension (KE). The contractions were maintained at 0%, 30%, and 60% of their respective maximum voluntary isometric contraction (MVC) forces for 5 s each at 50˚ hip flexion and 90˚ knee flexion. RF elasticity was measured in two regions, proximal (33%) and distal (67%). The shear modulus (kPa), measured by shear wave elastography, was used to determine RF elasticity.</p><p><strong>Results: </strong>A significant interaction effect was observed (intensity × region × task) (P = 0.01). Regarding regional differences during contraction, the proximal region exhibited a greater shear modulus than the distal region at 60% MVC in the hip flexion task (P = 0.001). Conversely, no regional differences were observed at either 30% MVC (P = 0.625) or 60% MVC (P = 0.568) in the knee extension task.</p><p><strong>Discussion: </strong>Muscle shear modulus during contraction reflects active force, suggesting that mechanical stress can be applied primarily to the proximal region of the RF during the HF task.</p>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"102967"},"PeriodicalIF":2.0,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142840357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexor hallucis longus and tibialis anterior: A synergistic relationship.","authors":"Jacob Fanous, Charles L Rice","doi":"10.1016/j.jelekin.2024.102966","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102966","url":null,"abstract":"<p><p>Flexor hallucis longus (FHL) is an important muscle of the foot and ankle during locomotion, contributing to hallux and plantar flexion. For optimal hallux flexion the ankle needs to be stabilized against plantar flexion which may require action of the dorsiflexors. Due to the deep location of the FHL contractile drive assessed by electromyography (EMG) has not been explored systematically. Thus, the purpose was to test the relationship between the FHL and tibialis anterior (TA), the main dorsiflexor. Using indwelling EMG during isometric maximal voluntary contractions (MVC) of hallux and ankle joint actions, 10 participants (3-females, 7-males) aged 23 ± 1.4 years were tested in custom hallux-flexion and ankle dynamometers, with bipolar wire electrodes recording from the FHL, soleus and TA muscles. During MVC, forces were 169.2 ± 28.5 N, 285.5 ± 65.4 N, and 712.3 ± 313.8 N for hallux flexion, dorsiflexion, and plantar flexion, respectively. During maximal hallux flexion, TA EMG was 53 % (±26.5) of its maximum with negligible soleus activity, 4.7 % (±3.1). No significant correlations were found between TA activity and strength, foot characteristics, sex, height, weight, or soleus activity. This higher level of relative EMG recorded from the TA during maximal hallux flexion has not been observed in prior studies during walking and indicates that the relationship between the FHL and TA is task dependent, thus highlighting the important synergistic role of the TA in allowing optimal toe flexion.</p>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"102966"},"PeriodicalIF":2.0,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142840359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The unprecedented progresses in neuromechanics over the past 50 years - In celebration of the 50th anniversary of the international society of biomechanics.","authors":"Daniel Hahn, Catherine Disselhorst-Klug, Deborah Falla, Dario Farina","doi":"10.1016/j.jelekin.2024.102963","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102963","url":null,"abstract":"","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"102963"},"PeriodicalIF":2.0,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142792471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reliability of reflex measurements and perceived instability following cutaneous stimulation during gait.","authors":"Annalee M H Friedman, Leif P Madsen","doi":"10.1016/j.jelekin.2024.102958","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102958","url":null,"abstract":"<p><p>Individuals with chronic ankle instability (CAI) exhibit a variety of sensorimotor deficits which contribute to long-term health risks and lower overall health-related quality of life. Recent literature finds abnormal cutaneous reflex characteristics and perceptions of instability during gait among those with CAI. These may serve as important patient-specific outcome measures in diagnosing and monitoring the condition, however, the test-retest reliability of these measurements is still undetermined. Therefore, the purpose of this study is to assess reliability of cutaneous reflex amplitudes and variability and perceived instability following perturbation in those with CAI and healthy controls during gait. Subjects walked on a treadmill while receiving random, non-noxious sural nerve stimulations throughout the stance phases of gait. Muscle activity was measured via electromyography for the peroneus longus, and medial and lateral gastrocnemius. Subjects reported their perceived instability following each stimulation. Cutaneous reflex amplitudes and perceived instability throughout the stance phases of gait can be reliably measured within the same day and over a 1-week period while reflex variability may be a less reliable measure. Our findings support the use of these variables as clinical outcome measures to identify and monitor neuromuscular recovery.</p>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"102958"},"PeriodicalIF":2.0,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142808767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wavelet-based time-frequency intermuscular beta-band coherence decreases with age but increases after mental fatigue in ankle muscles during gait independent of age.","authors":"Paulo Cezar Rocha Dos Santos, Fabio Augusto Barbieri, Claudine Lamoth, Tibor Hortobágyi","doi":"10.1016/j.jelekin.2024.102957","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102957","url":null,"abstract":"<p><p>Mental fatigue can affect cognitive function and interfere with motor performance. We examined if mental fatigue affected gait through age-specific modulation of wavelet-based time-frequency intermuscular beta-band coherence in muscles while walking on a treadmill at 1.2 m·s-1. The Psychomotor Vigilance Task, and the AX-Continuous Performance and the Stroop tests were used to induce mental fatigue in groups of healthy young and older participants. Mental fatigue reduced stance time, stride length, and marginally step width and increased cadence, stride length and stance time variability. In older compared with young participants before the induction of mental fatigue, wavelet-based time-frequency intermuscular beta-band coherence measured during walking was lower in the tibialis-peroneus and tibialis-gastrocnemius muscle pairs in specific phases of the gait cycle. In both age groups, after induction of mental fatigue, selected clusters of wavelet-based time-frequency intermuscular beta-band coherence measured during walking increased in the biceps-semitendinosus, rectus-vastus, tibialis-peroneus, gastrocnemius-soleus, and tibialis-gastrocnemius muscle pairs. In conclusion, we observed that while old age might weaken oscillatory coupling between selected ankle muscle pairs during gait, reflecting a certain level of impairment in the descending drive to these muscles, wavelet-based time-frequency intermuscular beta-band coherence measured during gait after mental fatigue migth increase independent of age.</p>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"102957"},"PeriodicalIF":2.0,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142792474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of voluntary activation of abdominal flexors using transcranial magnetic stimulation.","authors":"Olivia Szepietowski, Hanne Ertman, Shin-Yi Chiou, Paul H Strutton","doi":"10.1016/j.jelekin.2024.102961","DOIUrl":"https://doi.org/10.1016/j.jelekin.2024.102961","url":null,"abstract":"<p><strong>Background: </strong>Transcranial magnetic stimulation (TMS) has been used to assess voluntary activation (VA) of limb and back muscles, however its ability to assess abdominal muscle VA is unknown. The assessment of abdominal muscle VA using TMS could be applied to patients with trunk dysfunction to enable further understanding of the neurophysiology of trunk control, inform practice and enable the development and monitoring of rehabilitation programmes.</p><p><strong>Aim: </strong>The aim of this study was to investigate use of TMS and the twitch interpolation technique to measure voluntary activation of abdominal muscles.</p><p><strong>Methods: </strong>Twenty healthy participants performed sets of isometric abdominal contractions of varying levels, during which TMS was applied to the primary motor cortex. The evoked twitches were measured as torque, while simultaneous surface electromyographic (EMG) activity was recorded bilaterally from rectus abdominis, erector spinae, tensor fasciae latae, and rectus femoris. VA was calculated as: (1 - superimposed twitch amplitude/estimated resting twitch amplitude) x 100. Estimated resting twitch amplitude was calculated by extrapolation using linear regression of superimposed twitch amplitude against torque for contraction strengths 50-100 % maximum voluntary contraction (MVC).</p><p><strong>Results: </strong>There was a strong linear relationship between voluntary torque of 50-100 % MVC and TMS-evoked twitch amplitude (r² = 0.994, p = 0.035), and voluntary torque between 50-100 % MVC and VA (r² = 0.997, p = 0.025). VA at a target torque of 100 % MVC was less than 100 % (86.20 ± 2.29 %).</p><p><strong>Conclusions: </strong>VA of abdominal muscles can be assessed with twitch interpolation using TMS. VA has been shown to be submaximal during maximum voluntary contractions, and it has been demonstrated that superimposed twitch amplitude decreases in a linear fashion with increasing contraction intensity. Using this technique to explore trunk muscle function could help to improve understanding of the neurophysiology of trunk control, including the sites on any deficit in drive and also improve monitoring of the efficacy of treatment regimes for clinical conditions associated with dysfunctions in trunk control e.g. low back pain.</p>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"102961"},"PeriodicalIF":2.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142787805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lower limb biomechanics and control of center of mass during turning phases in daily gait","authors":"Riku Kawabata ,&nbsp;Moeka Yokoyama ,&nbsp;Yuka Matsumoto ,&nbsp;Keisuke Kubota ,&nbsp;Sachiko Kosuge ,&nbsp;Yasuyo Sunaga ,&nbsp;Naohiko Kanemura","doi":"10.1016/j.jelekin.2024.102959","DOIUrl":"10.1016/j.jelekin.2024.102959","url":null,"abstract":"<div><div>This study aims to elucidate the biomechanical characteristics of turning in daily life by analyzing the three-step process of approach, turn, and departure phases. The research involved ten healthy young individuals performing straight walking and 90° turns, categorized into Side-Step (SS) and Cross-Step (CS) turns. Using a 17-camera motion capture system and force plates, the study measured joint angles, moments, and center of mass (COM) variations. The results indicated that turning involves rotational movements of the lower limbs across three phases, with distinct biomechanical roles for each step. From the perspective of COM control, instability increased at the departure foot in SS, while in CS, stability was maintained at both the approach and departure foot.</div><div>This study emphasized the importance of rotational movements and rotational forces in the lower limb joints during turning. It also revealed that the center of mass is controlled across three steps. These findings highlight the need for a comprehensive analysis of turning and add a new perspective to gait analysis during turning.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"Article 102959"},"PeriodicalIF":2.0,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Neuromechanical adaptations in the gastrocnemius muscle after Achilles tendon rupture during walking","authors":"Raad M. Khair ,&nbsp;Jadyn Watt ,&nbsp;Maria Sukanen ,&nbsp;Neil J. Cronin ,&nbsp;Taija Finni","doi":"10.1016/j.jelekin.2024.102962","DOIUrl":"10.1016/j.jelekin.2024.102962","url":null,"abstract":"<div><div>Although some Achilles tendon rupture (ATR) patients regain function in low-force levels activities, it is not yet well known how neuromuscular and structural alterations after ATR manifest during everyday-locomotion. This study assessed medial gastrocnemius (MG) fascicle shortening during walking 1-year after ATR. Additionally, we explored neuromuscular alterations in lateral gastrocnemius (LG), soleus and flexor hallucis longus (FHL) muscles.</div><div>We observed 3.1 pp (95 %CI 0.8–5.4 pp) higher average and 14.5 pp (95 %CI 0.5–28.5 pp) higher peak LG surface electromyography amplitude in the injured compared to the un-injured during walking, but no differences were observed in soleus or FHL. The injured limb fascicles were 12.9 mm shorter while standing compared to the un-injured limb. In absolute terms, MG shortening in the injured limb was 2.8 mm (95 %CI 0.96–4.6 mm) smaller compared to the un-injured limb. However, when normalized to standing fascicle length, the amount of shortening was not different between the limbs.</div><div>Our results showed that 1-year after ATR, MG muscle had remodelled, which manifested as shorter fascicle length during standing. During walking, injured and un-injured MG fascicles showed similar shortening relative to the standing fascicle length, suggesting that MG could function effectively at the new mechanical settings during everyday locomotion.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"Article 102962"},"PeriodicalIF":2.0,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identification of muscle-activation-dependent human-exoskeleton coupling parameters","authors":"Cheng Huang ,&nbsp;Shuang Ji ,&nbsp;Tianyi Sun,&nbsp;Zhenlei Chen,&nbsp;Qing Guo,&nbsp;Yao Yan","doi":"10.1016/j.jelekin.2024.102946","DOIUrl":"10.1016/j.jelekin.2024.102946","url":null,"abstract":"<div><div>This paper proposed a muscle-activation-dependent human-exoskeleton model for predicting human-exoskeleton coupling parameters to improve the studies of coupling dynamics. With a newly designed platform and the help of 20 volunteers (10 males and 10 females, age: 24.45 ± 2.31 years old, height: 167.70 ± 8.35 cm, weight: 66.50 ± 18.74 kg), coupling parameters were identified with surface electromyographic (EMG) signals monitored to represent muscle activation. Then convolutional neural network (CNN) was used to predict coupling parameters with six EMG features as inputs:mean absolute value (MAV), mean absolute value slope (MAVSLP), waveform length (WL), Willison Amplitude (WAMP), variance (VAR), and auto regressive (AR) coefficients. Finally, sensitivity analysis of the CNN’s performance identified AR, MAV, and VAR as the key determinants of the coupling parameters. Further analysis unveiled strong correlation between coupling stiffness and both MAV and VAR. The novelty and contribution are the design of coupling experimental platform and the establishment of muscle-activation-dependent human-exoskeleton coupling model which provides a possibility to obtain coupling parameter identification form complex human-exoskeleton interaction scenarios.</div></div>","PeriodicalId":56123,"journal":{"name":"Journal of Electromyography and Kinesiology","volume":"80 ","pages":"Article 102946"},"PeriodicalIF":2.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}