scholarly journals Lower-Limb Electromyography Signal Analysis of Distinct Muscle Fitness Norms under Graded Exercise Intensity

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2147
Author(s):  
Ching-Kun Chen ◽  
Shyan-Lung Lin ◽  
Tasi-Chu Wang ◽  
Yu-Jie Lin ◽  
Chieh-Liang Wu
Keyword(s):  
Physical Fitness ◽  
Frequency Domain ◽  
Time Domain ◽  
Exercise Intensity ◽  
Lower Limb ◽  
Lower Limbs ◽  
Moderate Intensity ◽  
Median Frequency ◽  
Low Intensity ◽  
Muscle Fitness

Physical fitness is the overall ability of the body to adapt to the working environment and perform sporting and daily activities. The aim of this study was to analyze the correlation between muscle fitness and the electromyography (EMG) signals of lower limbs under varying exercise intensity. The standing long jump was used as a test task for assessing the power of the lower limb muscles. Participants were university freshmen who belonged to the top 20%, middle 20%, and bottom 20% groups in terms of physical fitness norms. The EMG signals of the participants’ lower limbs while they performed squats were collected under four exercise intensities of repetitions maximum (RM): no load, 8RM, 18RM, and 28RM; the features of the signals were extracted using time-domain and frequency-domain analysis. Statistical analysis was also performed. The top and bottom groups exhibited significant differences time-domain indicators mean absolute value (MAV) and average amplitude change (AAC) in the low-intensity exercise (28RM). The MAV, variance of EMG (VAR), root mean square (RMS), and AAC were significantly different between the top and bottom groups in the three graded intensities (8RM, 18RM, and 28RM). The mean frequency (MNF) and median frequency (MDF), which are frequency-domain indicators, were significantly different between the top and bottom groups in the low-intensity (28RM) and moderate-intensity (18RM) exercises.

scholarly journals Comparison of tibialis anterior and gastrocnemius muscles activation on balance training devices and hoverboard

2017 ◽  
Vol 13 (4-2) ◽  
pp. 495-500 ◽  
Author(s):  
Khairiyah Abdul Rahman ◽  
Aizreena Azaman ◽  
Hadafi Fitri Mohd Latip ◽  
Mohd Azuwan Mat Dzahir ◽  
Malarvili Balakrishnan
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Tibialis Anterior ◽  
Gastrocnemius Muscle ◽  
Balance Training ◽  
Domain Analysis ◽  
Median Frequency ◽  
Training Device ◽  
Emg Signal ◽  
Significant Difference

Balance training devices such as wobble board, basu ball and balance cushion are the tool use in balance training exercise programme in order to improve muscle strength and restore posture balance due degeneration of body function or injury. Recently, self-balancing scooter such as Segway and hover board showed a positive effects on rehabilitation. However, it is less known how these devices affect muscle physiological properties. This study aims to to measure ankle muscles activation on  difference balance training devices and hover board. Besides, a comparison between these device will be done in order to identify if hover board has a promising feature to be an alternative balance training device. In this research, surface EMG (sEMG) was used to record tibialis anterior and gastrocnemius muscle activities. Seventeen healthy subjects were required to stand on three different types of balance training device such as wobble board, balance cushion, bosu ball and a hover board. They were asked to maintain their standing position on each devices for two minutes. Both time domain and frequency domain analysis were used to identify the features of the EMG signal. Time domain analysis measurement involved average rectified value (ARV) and root mean square (RMS), meanwhile for frequency domain, median frequency (MDF) of the signal were measured. The results shows that, the RMS is differed significantly between the balance training devices (p<0.05) for tibialis anterior muscle but not gastrocnemius muscle. Meanwhile, no significant difference between the devices in the ARV and the MDF value (p>0.05). Besides, less stable devices increased muscle activity were observed. There is not much difference between hover board and the other devices in term of physiological effects of both tibialis anterior and gastrochemious muscle. It is also suggested that hover board offers a promising feature to be an alternative device for balance training device.

EFFECT OF CYCLE ERGOMETER USING AN MR ROTARY BRAKE ON LOWER LIMB EXERCISE

2013 ◽  
Vol 13 (06) ◽  
pp. 1340017
Author(s):  
CHANG HO YU ◽  
MI YU ◽  
KYUNG KIM ◽  
TAE KYU KWON
Keyword(s):  
Visual Feedback ◽  
Lower Limb ◽  
Cycle Ergometer ◽  
Lower Limbs ◽  
Mechanical Resistance ◽  
Term Condition ◽  
Low Intensity ◽  
Feedback Mode ◽  
Cycle System

In this study, a new cycle ergometer system using a magneto-rheological (MR) rotary brake was developed to improve muscular strength and reduce asymmetric pedaling characteristics for the rehabilitation of hemiplegia patients. For evaluation of this cycle ergometer, the characteristics of lower limb muscles were analyzed according to three factor of cycle system with MR rotary brake: (1) the electrical current of MR rotary brake, (2) the intensity and duration of cycling, (3) the application of visual feedback. The results showed that muscle activity was significantly different for various levels of current applied to the MR rotary brake. A higher current was associated with a higher integrated electromyography (IEMG) of the lower limb muscle. In low-intensity and long-term condition, IEMG of RF, TA, VL and VAS increased in the late stage of exercise (compared to the early stage), however, decreased in high-intensity and short term condition. The asymmetry of pedaling between the dominant and non-dominant leg was 19.63% in the non-visual feedback mode and 1.97% in the visual feedback mode. Therefore, our new cycle system using an MR brake with real time control of mechanical resistance can be used to enhance muscle strength in patients with hemiplegia and elderly people. Increased muscular activity of the lower limbs in patients with hemiplegia and the elderly is expected with low-intensity training over a long-term period.

scholarly journals Regulation data for the horizontal jump of children and adolescents

2021 ◽  
Author(s):  
Rossana Gomez-Campos ◽  
Ruben Vidal-Espinoza ◽  
Luis Felipe Castelli Correia de Campos ◽  
Cynthia Lee Andruske ◽  
Jose Sulla-Torres ◽  
...  
Keyword(s):  
Children And Adolescents ◽  
Lower Limb ◽  
Cross Sectional Study ◽  
Lower Limbs ◽  
International Studies ◽  
Limb Muscle ◽  
Sectional Study ◽  
Cross Sectional ◽  
Lower Limb Strength ◽  
Muscle Fitness

The Horizontal Jump (HJ) is a daily tool that could be used to categorize the level of muscle fitness performance of the lower limbs. The goal was to compare the muscle fitness with those of international studies and to propose percentiles to assess the HJ performance of children and adolescents. A cross-sectional study was conducted. A total number of 3023 children and adolescents between the ages of 6.0 to 17.9 were studied. Weight, height, waist circumference (WC), and lower limb muscle fitness were evaluated. The student HJ performance values in Chile were inferior when compared to HJ performance in Brazil, Poland and Europe. For the Greek study, differences occurred only from age 6 to 15 years old. In comparison to Colombia, students showed better muscle fitness performance. These differences appeared in childhood and lasted until the beginning of adolescence. Percentiles were created to assess the lower limb fitness being an easy tool to be used and applied to classify lower limb strength.

scholarly journals Plasma cytokine and exertional responses in relation to exercise intensity and volume of exercising muscle mass during arm-crank ergometry

2015 ◽  
Vol 40 (8) ◽  
pp. 782-787 ◽  
Author(s):  
Thomas A. Paulson ◽  
Victoria L. Goosey-Tolfrey ◽  
Christof A. Leicht ◽  
Nicolette C. Bishop
Keyword(s):  
Oxygen Uptake ◽  
Muscle Mass ◽  
Upper Limb ◽  
Exercise Intensity ◽  
Perceived Exertion ◽  
Peak Oxygen Uptake ◽  
Total Power ◽  
Moderate Intensity ◽  
Plasma Cytokine ◽  
Low Intensity

This original study investigated the effect of submaximal exercise intensity and volume of contracting muscle mass on plasma inflammation-mediating cytokine and perceived exertional responses to acute arm-crank ergometry (ACE). Twelve recreationally active but upper limb untrained males performed 30 min of (i) low-intensity (40% peak oxygen uptake) ACE (LOW); (ii) moderate-intensity (60% peak oxygen uptake) ACE (MOD); and (iii) concurrent low-intensity (40% peak oxygen uptake) ACE plus lower limb cycle ergometry to match total power output in MOD (HYB). Plasma concentrations of interleukin (IL)-6, IL-10, IL-1ra, adrenaline, and cortisol were determined at rest, immediately postexercise, and 1 h and 2 h postexercise. Heart rate (HR) and differentiated ratings of perceived exertion (RPE) were also recorded. Plasma IL-6 concentrations were elevated (p < 0.05) immediately postexercise and 1 h postexercise (∼2.5-fold) in all trials and 2 h postexercise in MOD (3-fold). Plasma IL-1ra concentrations were elevated (p < 0.05) 2 h postexercise in MOD only (2-fold). No plasma IL-10, cortisol, and adrenaline responses were observed. HR and differentiated RPE were significantly higher during MOD than HYB and LOW. Peripheral RPE were significantly higher than central and overall RPE in each trial. Thirty minutes of moderate intensity ACE initiated a plasma cytokine response associated with the protective effect of regular exercise against cardiovascular and metabolic disease risk. Further work is required to establish an optimal intensity and duration of upper limb exercise to maximise the anti-inflammatory potential whilst managing the risk of over-use injury.

scholarly journals A Review of Beneficial Low-Intensity Exercises in Diabetic Peripheral Neuropathy Patients

2019 ◽  
Vol 22 ◽  
pp. 22-27 ◽  
Author(s):  
Carley E Johnson ◽  
Jody K Takemoto
Keyword(s):  
Peripheral Neuropathy ◽  
Diabetic Peripheral Neuropathy ◽  
Lower Limbs ◽  
Moderate Intensity ◽  
Cochrane Library ◽  
Diabetic Patients ◽  
Moderate Intensity Exercise ◽  
Low Intensity ◽  
Starting Point ◽  
Foot Sensation

The American Diabetic Association standards of medical care for diabetic patients recommends moderate intensity exercise to help manage diabetes; however, this recommendation may be unmanageable for patients who have become inactive or unable to reach this intensity. The purpose of this review is to determine if low-intensity exercises demonstrate improvement in diabetic peripheral neuropathy symptoms in order to utilize these exercises as a starting point for inactive patients. Studies in low-intensity exercises from 2013 to May 2018 were systematically searched in PubMed, SCOPUS, and Cochrane Library databases. The studies in this research have shown that low-intensity resistance exercises have promising outcomes such as improvements in pain interference with daily activities, pain thresholds, and reductions in neuropathy symptoms. Low-intensity aerobic therapy adds to the quality of life of the patient, and increases in strength of the lower limbs show an improvement in foot sensation and a reduction in pain and tingling symptoms. 

scholarly journals Establishment of a murine, lipopolysaccharide-induced sepsis model for testing anaerobic exercise thresholds and early mobilization

2020 ◽  
Author(s):  
Yujiro Matsuishi ◽  
Nobutake Shimojo ◽  
Haruhiko Hoshino ◽  
Yuki Enomoto ◽  
Bryan J. Mathis ◽  
...  
Keyword(s):  
Exercise Training ◽  
Mouse Model ◽  
Acute Phase ◽  
Rectal Temperature ◽  
Exercise Intensity ◽  
Early Mobilization ◽  
Moderate Intensity ◽  
Low Intensity ◽  
Slope Method ◽  
Low Intensity Exercise

Abstract Background: Several methods have been proposed to prevent post intensive care syndrome (PICS) after sepsis, including early mobilization, but controversy remains in mechanisms and outcomes. Translational studies are required to fully reveal the optimal exercise intensity during acute phase sepsis. The aim of this study is to establish a septic mouse model and and classify exercise intensi ties during the acute phase of sepsis. Methods: Adult, male C57/B6 mice received lipopolysaccharide (LPS) injections (20mg/kg). We recorded survival rates and metabolic changes, such as resting energy expenditure (REE) compared with controls up to 72h after LPS administration. We also observed vital signs (rectal temperature and weight change) and inflammation (TNF-αand IL-6). We detected exercise intensity via metabolic monitoring treadmill, analyzed the anaerobic threshold (AT) by V-Slope Method and classified the intensity levels according to American College of Sports Medicine (ACSM) guidelines.Result: Around 30% of the mice survived 72h after LPS induction with REE and rectal temperatures lowest at around 22-24h later (REE at 22h: 2.26±0.34 kcal/day p<0.05 vs. baseline; Rectal temperature at 24h: 29.17±0.48℃, p<0.05 vs. baseline). Gradual recovery was seen out to 72h. Blood concentrations of TNF-α were highest at the 12h timepoint (41.23±24.39 pg/ml, p<0.05 vs. baseline) and IL-6 was highest at 24h after LPS induction (1476.5±274.7 pg/ml, p<0.05 vs. baseline). Using the V‐Slope method, we observed the AT at each timepoint (6h:14m/min,12h: 9m/min, 24h:4m/min,36h:10m/min, 48h:16m/min,60h:20m/min,72h:22m/min) and classified these into very low intensity exercise training (VLIT), low intensity exercise training (LIT), or moderate intensity exercise training (MIT) at each timepoint. Conclusion: We classified exercise intensities out to 72h after sepsis recovery using a mouse model. These data may serve as a bridge to clinical studies to fill gaps in best practice for sepsis rehabilitation.

Effects of Different Intensity Walking on Serum Nitric Oxide for the Elderly Men

2013 ◽  
Vol 641-642 ◽  
pp. 748-751
Author(s):  
Ke Xin Ren
Keyword(s):  
Nitric Oxide ◽  
Cardiovascular Disease ◽  
Exercise Intensity ◽  
High Intensity ◽  
Moderate Intensity ◽  
Oxide Content ◽  
Elderly Men ◽  
Blood Samples ◽  
Low Intensity ◽  
Group Serum

Objective: In order to study the effect of different intensity exercise on serum nitric oxide and nitric oxide synthase of elderly men, and look for the most appropriate exercise intensity for them which can prevent cardiovascular disease. Methods: 36 men who are 55 to 62 years old, were randomly divided into the low intensity group(L group,n=12), the moderate-intensity group(M group,n=12) and the high-intensity group(H group,n=12). During the period for testing, they walked for 12 weeks, 4 times per week, 45 minutes for each time,target heart rate is 100 ~110 beats/min(L group), 110 ~120 beats/min(M group), 120~ 130 beats/min(H group). With an over-night fast, all the subject venous blood samples were drawn by 4ml before and after the exercise. The blood samples were centrifuged and separated immediately, then serum nitric oxide content, TNOS activity, cNOS activity, iNOS activity were measured.Results:In low-intensity group, serum NO content, TNOS activity, cNOS activity were significantly increased than pre-exercise (P<0.05); in moderate-intensity group,serum NO content,TNOS activity,cNOS activity were very significantly increased than pre-exercise (P <0.01);the indicators of high-intensity exercise group did not change significantly. Conclusion: we recommend that a more appropriate exercise intensity is 100-120 beats /min for elderly during fitness exercise, and especially 110-120 beats/min. Such intensity exercise can increase NO content in vivo, thus effectively prevent the occurrence of cardiovascular disease.

Design of a Human Knee Reeducation Mechanism

2019 ◽  
Vol 11 (1) ◽  
pp. 42-53
Author(s):  
Allaoua Brahmia ◽  
Ridha Kelaiaia
Keyword(s):  
Lower Limb ◽  
Mechanical Design ◽  
Kinematic Chain ◽  
Lower Limbs ◽  
Kinematic Structure ◽  
Robotic Device ◽  
Human Knee ◽  
Kinematic Study ◽  
Rehabilitation Exercise ◽  
New Machine

Abstract To establish an exercise in open muscular chain rehabilitation (OMC), it is necessary to choose the type of kinematic chain of the mechanical / biomechanical system that constitutes the lower limbs in interaction with the robotic device. Indeed, it’s accepted in biomechanics that a rehabilitation exercise in OMC of the lower limb is performed with a fixed hip and a free foot. Based on these findings, a kinematic structure of a new machine, named Reeduc-Knee, is proposed, and a mechanical design is carried out. The contribution of this work is not limited to the mechanical design of the Reeduc-Knee system. Indeed, to define the minimum parameterizing defining the configuration of the device relative to an absolute reference, a geometric and kinematic study is presented.

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