Surface Electromyography in Sports and Exercise

Türker, Hande; Sözen, Hasan

doi:10.5772/56167

Cited by 44 publications

(34 citation statements)

References 51 publications

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“…They suggested that changes in the functional properties of the muscles rather than activation might have led to a reduced workload. Furthermore, the precise relationship between metabolic cost and muscle activity is still unclear, especially because EMG measurements are not directly indicative of muscle force production ( Türker and Sözen, 2013 ; Vigotsky et al, 2018 ). Many factors that may have been altered by wearing the X-tights, such as muscle fascicle length, muscle geometry, and passive structural components, can also contribute to force production and cannot be identified with surface EMGs alone ( Mesin et al, 2006 ; Massó et al, 2010 ; Farris et al, 2013 ).…”

Section: Discussionmentioning

confidence: 99%

A Fully Soft and Passive Assistive Device to Lower the Metabolic Cost of Sit-to-Stand

Lee

Kim

Park

2020

Front. Bioeng. Biotechnol.

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Various assistive devices like exoskeletons have been developed to aid the growing number of disabled people. Recent studies have started to explore using soft rather than rigid components to create lightweight and unobtrusive systems that can be more easily adopted by the general population. However, there is a tradeoff between compliance and power in these systems. We investigated the physiological benefits of using an inconspicuous, soft and passive assistive device which would avoid bulkiness, heaviness and user discomfort. We chose to assist the sit-to-stand (STS) maneuver because it is a common activity of daily living (ADL). STS is also recognized as one of the most challenging ADLs due to the high knee torque required, and the primary limiting factor is known to be knee extensor strength. Thus, the objective of this research was to develop and evaluate an unobtrusive knee assist wear called X-tights that could aid knee extension during STS using only soft and passive components. This was accomplished by routing elastic bands across the lower extremity. Thirty-one healthy participants performed STS tests with and without the X-tights, while metabolic cost and muscle activity were recorded. Metabolic power significantly decreased, by 3.2 ± 1.5% (P = 0.04), when utilizing the X-tights during the STS, while there was no statistically significant differences in muscle activity. The present work introduces a new soft and passive assist wear that can be worn inconspicuously under normal clothing, and we demonstrate promising results for the future development and integration of soft assistive technology for daily life.

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Section: Discussionmentioning

confidence: 99%

A Fully Soft and Passive Assistive Device to Lower the Metabolic Cost of Sit-to-Stand

Lee

Kim

Park

2020

Front. Bioeng. Biotechnol.

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“…Muscles and their activity, during the examination of motor organs, are usually assessed only through palpation and observation. The use of surface electromyography enables the evaluation and monitoring of muscles’ activity and their behaviour in real time [7].…”

Section: Discussionmentioning

confidence: 99%

“…Biofeedback is a therapy which involves sending the feedback signals about changes in the physiological state of the patient’s body owing to which patients can, by observing the results, consciously modify the functions that are not controlled consciously under normal conditions – in this case it is muscle tension. The electromyographic analysis can provide valuable information as to the relative muscle activity required by a given exercise and help to determine the optimal body position for the exercise [7]. Thanks to the use of this method, patients can independently and properly perform exercises they are assigned, both isometric and active but slow ones.…”

Section: Discussionmentioning

confidence: 99%

The use of surface electromyography in rehabilitating rheumatic patients after knee arthroplasty (pilot study)

2019

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ObjectivesThe aim of the conducted research was to assess muscle performance in rheumatic patients qualified for knee arthroplasty before and after surgical treatment.Material and methodsPatients with the diagnosis of rheumatoid arthritis or a degenerative joint disease qualified for surgical treatment were examined. Three groups were analysed: 1) a control group, 2) a group of patients qualified for knee arthroplasty (G1), 3) a group of patients with one knee joint endoprosthesis qualified for the second surgery (G2). The study was carried out through a portable surface electromyography system from Noraxon U.S.A. INC., Clinical DTS and using surface electrodes. The surface electromyography (sEMG) examination was conducted twice: before and on the 10th day after the surgery. The study concerned the quadriceps femoris muscle, i.e. its straight and medial head in both lower limbs during isometric tension and active movement.ResultsThe comparison of the examined muscles’ activity in the control group revealed greatly increased activity during isometric tension than during active movement in both muscles. In the G1 group, the comparison of the average values of isometric tension of the examined muscles before the surgery showed slight differences between the healthy limb and the one qualified for the surgical treatment. After the surgery, significant asymmetry between the average values achieved by the healthy and the operated limb could be identified in both muscles. In the G2 group, muscle activity within the currently operated limb revealed only slight differences between the limbs before the surgery. After the surgery, there was an increase in muscle activity within the previously operated limb.ConclusionsConsiderably higher average values of muscle activity during the isometric tension, when compared to the active movement in a sitting position, indicate the necessity of more widespread use of isometric tension in rehabilitating patients after knee arthroplasty.

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“…Initially, raw sEMG signals were filtered with sixth-order bandpass Butterworth filter (cutoff frequency 20–150 Hz[9]) to attenuate noises, followed by calculation of root mean square (RMS). [1011] RMS value of sEMG signal represents overall muscle activity and muscular tension[12] (provided muscle is not fatigued). The amplitude of sEMG signal was approximately proportional to force produced by the underlying muscle group, and it is used to compare the muscle effort applied by individuals to perform Trikonasana.…”

Section: Methodsmentioning

confidence: 99%

A mathematical method for electromyography analysis of muscle functions during yogasana

et al. 2019

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Context:For the past few decades, the number of people practicing yoga is increasing in number. Yogasanas need smooth body movements in the process of attaining defined postures that the person must hold on to activate specific muscles of the body related to that asana. Yogasanas should be performed with perfection to derive maximum benefits.Objective:The objective of this study was to introduce a mathematical method to understand muscle functionalities while doing Yogasanas.Materials and Methods:Used Delsys surface electromyography (sEMG) – Trigno™ (Delsys Inc.) sensors for data recording and analyzing muscle activation patterns.Results:Performance analysis was quantified using normalized sEMG signals. The sEMG data during final posture were fit to a straight line using linear regression analysis.Conclusion:The results suggested that the slope of the best fit line is a good metric for monitoring the muscle activity during Yoga performance. The advantages of this method are the slope of the line is a good indicator for monitoring the muscle activity while doing Yogasana and the method suggested in this study can be extended for analyzing other asanas as well.

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Surface Electromyography in Sports and Exercise

Cited by 44 publications

References 51 publications

A Fully Soft and Passive Assistive Device to Lower the Metabolic Cost of Sit-to-Stand

A Fully Soft and Passive Assistive Device to Lower the Metabolic Cost of Sit-to-Stand

The use of surface electromyography in rehabilitating rheumatic patients after knee arthroplasty (pilot study)

A mathematical method for electromyography analysis of muscle functions during yogasana

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