Evaluation of Muscle Activity and Human Standing Stability Index Using the Swash Plate in a Disturbance Application

Human standing stability was evaluated using a swash plate drop device in a disturbance application. Under different experimental conditions using the device, electromyogram (EMG) measurements showed that the left and right lower limb muscles were used differently. It also demonstrated that the dynamics also differed depending on the experimental conditions. In particular, the dynamics of standing stabilization in a tandem standing position and a normal standing position significantly differed, and the activities of related muscles were also significantly different; this indicates that standing stability may potentially depend on the subjects. These results indicate the need for the comprehensive consideration of the standing and disturbance conditions during the quantitative evaluation of human standing stability.

Download Full-text

Deficits in anticipatory inhibition of postural muscle activity associated with load release while standing in individuals with spastic diplegic cerebral palsy

Journal of Neurophysiology ◽

10.1152/jn.00253.2012 ◽

2013 ◽

Vol 109 (8) ◽

pp. 1996-2006 ◽

Cited By ~ 5

Author(s):

Hidehito Tomita ◽

Yoshiki Fukaya ◽

Kenji Totsuka ◽

Yuri Tsukahara

Keyword(s):

Cerebral Palsy ◽

Lower Limb ◽

Muscle Activity ◽

Erector Spinae ◽

Lower Limbs ◽

Control Group ◽

Lower Limb Muscles ◽

Limb Muscles ◽

Postural Muscle ◽

Load Release

This study aimed to determine whether individuals with spastic diplegic cerebral palsy (SDCP) have deficits in anticipatory inhibition of postural muscle activity. Nine individuals with SDCP (SDCP group, 3 female and 6 male, 13–24 yr of age) and nine age- and sex-matched individuals without disability (control group) participated in this study. Participants stood on a force platform, which was used to measure the position of the center of pressure (CoP), while holding a light or heavy load in front of their bodies. They then released the load by abducting both shoulders. Surface electromyograms were recorded from the rectus abdominis, erector spinae (ES), rectus femoris (RF), medial hamstring (MH), tibialis anterior (TA), and gastrocnemius (GcM) muscles. In the control group, anticipatory inhibition before load release and load-related modulation of the inhibition were observed in all the dorsal muscles recorded (ES, MH, and GcM). In the SDCP group, similar results were obtained in the trunk muscle (ES) but not in the lower limb muscles (MH and GcM), although individual differences were seen, especially in MH. Anticipatory activation of the ventral lower limb muscles (RF and TA) and load-related modulation of the activation were observed in both participant groups. CoP path length during load release was longer in the SDCP group than in the control group. The present findings suggest that individuals with SDCP exhibit deficits in anticipatory inhibition of postural muscles at the dorsal part of the lower limbs, which is likely to result in a larger disturbance of postural equilibrium.

Download Full-text

The Activity of Surface Electromyographic Signal of Selected Muscles during Classic Rehabilitation Exercise

Rehabilitation Research and Practice ◽

10.1155/2016/4796875 ◽

2016 ◽

Vol 2016 ◽

pp. 1-9 ◽

Cited By ~ 2

Author(s):

Jinzhuang Xiao ◽

Jinli Sun ◽

Junmin Gao ◽

Hongrui Wang ◽

Xincai Yang

Keyword(s):

Lower Limb ◽

Muscle Activity ◽

Activity Level ◽

Core Stability ◽

Median Frequency ◽

Low Back ◽

Lower Limb Muscles ◽

Significant Difference ◽

Limb Muscles ◽

Rehabilitation Exercises

Objectives. Prone bridge, unilateral bridge, supine bridge, and bird-dog are classic rehabilitation exercises, which have been advocated as effective ways to improve core stability among healthy individuals and patients with low back pain. The aim of this study was to investigate the activity of seven selected muscles during rehabilitation exercises through the signal of surface electromyographic. Approaches. We measured the surface electromyographic signals of four lower limb muscles, two abdominal muscles, and one back muscle during rehabilitation exercises of 30 healthy students and then analyzed its activity level using the median frequency method. Results. Different levels of muscle activity during the four rehabilitation exercises were observed. The prone bridge and unilateral bridge caused the greatest muscle fatigue; however, the supine bridge generated the lowest muscle activity. There was no significant difference (P>0.05) between left and right body side muscles in the median frequency slope during the four rehabilitation exercises of seven muscles. Conclusions. The prone bridge can affect the low back and lower limb muscles of most people. The unilateral bridge was found to stimulate muscles much more active than the supine bridge. The bird-dog does not cause much fatigue to muscles but can make most selected muscles active.

Download Full-text

Effect of Parkinson’s disease and two therapeutic interventions on muscle activity during walking: a systematic review

npj Parkinson s Disease ◽

10.1038/s41531-020-00119-w ◽

2020 ◽

Vol 6 (1) ◽

Author(s):

Aisha Islam ◽

Lisa Alcock ◽

Kianoush Nazarpour ◽

Lynn Rochester ◽

Annette Pantall

Keyword(s):

Parkinson’S Disease ◽

Motor Activity ◽

Lower Limb ◽

Muscle Activity ◽

Therapeutic Interventions ◽

Gait Impairment ◽

Dopaminergic Medication ◽

Lower Limb Muscles ◽

Limb Muscles ◽

Functional Gait

Abstract Gait deficits are a common feature of Parkinson’s disease (PD) and predictors of future motor and cognitive impairment. Understanding how muscle activity contributes to gait impairment and effects of therapeutic interventions on motor behaviour is crucial for identifying potential biomarkers and developing rehabilitation strategies. This article reviews sixteen studies that investigate the electromyographic (EMG) activity of lower limb muscles in people with PD during walking and reports on their quality. The weight of evidence establishing differences in motor activity between people with PD and healthy older adults (HOAs) is considered. Additionally, the effect of dopaminergic medication and deep brain stimulation (DBS) on modifying motor activity is assessed. Results indicated greater proximal and decreased distal activity of lower limb muscles during walking in individuals with PD compared to HOA. Dopaminergic medication was associated with increased distal lower limb muscle activity whereas subthalamic nucleus DBS increased activity of both proximal and distal lower limb muscles. Tibialis anterior was impacted most by the interventions. Quality of the studies was not strong, with a median score of 61%. Most studies investigated only distal muscles, involved small sample sizes, extracted limited EMG features and lacked rigorous signal processing. Few studies related changes in motor activity with functional gait measures. Understanding mechanisms underpinning gait impairment in PD is essential for development of personalised rehabilitative interventions. Recommendations for future studies include greater participant numbers, recording more functionally diverse muscles, applying multi-muscle analyses, and relating EMG to functional gait measures.

Download Full-text

Reduction of the muscle activity associated with self-imposed electrical stimulation of mixed nerves supplying lower limb muscles in man

Journal of Electromyography and Kinesiology ◽

10.1016/s1050-6411(01)00037-2 ◽

2002 ◽

Vol 12 (4) ◽

pp. 247-258 ◽

Cited By ~ 2

Author(s):

L. Gerilovsky ◽

D. Philipova ◽

S. Georgieva

Keyword(s):

Electrical Stimulation ◽

Lower Limb ◽

Muscle Activity ◽

Lower Limb Muscles ◽

Limb Muscles ◽

Stimulation Of

Download Full-text

Effect of Garment Pressure on Lower Limb Muscle Activity during Running

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.175-176.832 ◽

2011 ◽

Vol 175-176 ◽

pp. 832-836 ◽

Cited By ~ 1

Author(s):

Ya Ning Li ◽

A Ming Lu ◽

Xiao Qun Dai ◽

Jin Ao Chen ◽

Xiao Wen Zhao

Keyword(s):

Lower Limb ◽

Muscle Activity ◽

Blood Circulation ◽

Limb Muscle ◽

Sports Performance ◽

Healthy Male ◽

Lower Limb Muscles ◽

Male College ◽

Limb Muscles ◽

The Right

Recently, it has been reported that suitable garment pressure contributes to accelerating human blood circulation, improving sports performance and alleviating sports fatigue. In this study, effect of pressure exerted by knee-high gradient compression socks (GCS) on the lower limb muscles was investigated. Two healthy male college students volunteered to participate in this study. They were asked to run on a treadmill at a speed of 10 km/h with a GCS worn on one leg and a usual sports sock worn on the other leg until being tired out. During running, the surface electromyography (sEMG) of two lower limb muscles —— gastrocnemius medialis of the right leg (R-GM) and the left leg (L-GM) was recorded simultaneously. It was found that: pressure exerted on the lower limb by GCS gradually decreased from ankle to below-knee; GCS pressure helped to reduce muscle oscillation; wearing GCS seemed to help to reduce muscle fatigue during running.

Download Full-text

Long-term activity in upper- and lower-limb muscles of humans

Journal of Applied Physiology ◽

10.1152/jappl.2001.91.5.2224 ◽

2001 ◽

Vol 91 (5) ◽

pp. 2224-2232 ◽

Cited By ~ 77

Author(s):

Drew S. Kern ◽

John G. Semmler ◽

Roger M. Enoka

Keyword(s):

Lower Limb ◽

Muscle Activity ◽

Biceps Brachii ◽

Type I ◽

Recording Time ◽

Men And Women ◽

Leg Muscles ◽

Lower Limb Muscles ◽

Limb Muscles ◽

Age Range

Despite limited data on humans, previous studies suggest that there is an association between the duration of daily muscle activity and the proportion of type I muscle fibers. We quantified the activity of limb muscles in healthy men and women during normal use and compared these measurements with published reports on fiber-type proportions. Seven men (age range = 21–28 yr) and seven women (age range = 18–26 yr) participated in two 10-h recording sessions. Electromyogram (EMG) activity of four muscles in nondominant upper (first dorsal interosseus and biceps brachii) and lower limbs (vastus medialis and vastus lateralis) was recorded with surface electrodes. Hand and arm muscles were active for 18% of the recording time, whereas leg muscles were active for only 10% of the recording time. On average, upper-limb muscles were activated 67% more often than lower-limb muscles. When lower-limb muscles were activated, however, the mean amplitude of each burst was greater in leg muscles [18 and 17% maximum voluntary contraction (MVC)] compared with hand (8% MVC) and arm (6% MVC) muscles. Temporal association in activity between pairs of muscles was high for the two lower-limb muscles ( r 2 = 0.7) and relatively weak for the two upper-limb muscles ( r 2 = 0.09). Long-term muscle activity was only different between men and women for the biceps brachii muscle. We found no relation between duration of muscle activity in 10-h recordings and the reported values of type I fibers in men and women.

Download Full-text

The Effect of the Club Shape on the EMG Response of the Left and Right Trunk Muscles and Lower Limb Muscles during Swing

Journal of Golf Studies ◽

10.34283/ksgs.2019.13.4.22 ◽

2019 ◽

Vol 13 (4) ◽

pp. 301-314

Author(s):

Hee-Eun Lee ◽

◽

Sang-Woo Cho ◽

Ki-Hong Kim

Keyword(s):

Lower Limb ◽

Trunk Muscles ◽

Lower Limb Muscles ◽

Limb Muscles ◽

Left And Right

Download Full-text

The influence of foot arch on ankle joint torques andon sEMG signal amplitude in selected lower leg muscles

Advances in Rehabilitation ◽

10.1515/rehab-2015-0050 ◽

2016 ◽

Vol 30 (3) ◽

pp. 69-80

Author(s):

Kinga Żebrowska ◽

Katarzyna Homoncik

Keyword(s):

Lower Limb ◽

Muscle Activity ◽

Control Group ◽

Electromyographic Activity ◽

Semg Signal ◽

Joint Torques ◽

Lower Limb Muscles ◽

Flat Feet ◽

Limb Muscles ◽

Foot Arch

Abstract Introduction: This study sought to assess the influence of proper foot arch on electromyographic activity of selected lower limb muscles. The aim of this work was to evaluate the effects of foot arch on the activity of selected muscles and to determine whether electromyography might help to identify types of flat feet resulting from muscle- or ligament-related causes. Material and methods: The experiment involved 24 students of the Faculty of Rehabilitation, University of Physical Education in Warsaw. To determine Clarke’s angle, all study participants were examined with a podoscope. Based on the obtained results, the subjects were divided into two groups. The experimental group consisted of 12 individuals with low foot arches, while the control group included students with proper foot arches. The surface EMG (sEMG) signal was recorded from the following muscles: peroneus longus, tibialis anterior, gastrocnemius and soleus. First, the sEMG signal was recorded while measuring MVC for ankle extensors and flexors. Then, it was recorded in the following positions: free standing, two-leg standing on tiptoe, one-leg standing on tiptoe, pressing the first metatarsal head to the ground standing on heels. Results: No significant differences in muscle activity between the groups with low and proper foot arches were noted (p>0.05). Muscle activity did not prove to be a differentiating factor. Moreover, no differences were found in torques of ankle extensors and flexors between both groups. Conclusions: The findings of the study confirmed the hypothesis that the size of the foot arch had no effect on electromyographic activity of lower limb muscles. It was also revealed that flat feet did not lead to the weakening of muscle strength of ankle flexors and extensors.

Download Full-text