Effects of vibration therapy on neuromuscular efficiency &amp; features of the EMG signal based on endurance test

Alam, Mohd Mukhtar; Khan, Abid Ali; Farooq, Mohammad Omar

doi:10.1016/j.jbmt.2020.06.037

Cited by 16 publications

(20 citation statements)

References 53 publications

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“…Therefore, the NME was significantly higher in the flexor muscle (FDS) than in the extensor muscle (ECRB and ECU) in both groups for all VT protocols. In contrary, Alam et al (39) reported an increase in NME in the performance of ECRB muscle after 35 Hz of VT and ECU muscle after 23 Hz of VT. There is an evidence that continuous improvement in the NME is largely responsible for the additional strength gain.…”

Section: Neuromuscular Efficiencymentioning

confidence: 85%

“…However, Milner-Brown et al (38) showed a decrease in the NME of the flexor muscles (49 ± 15%). In addition, Alam et al (39) found more than 50% increase in neuromuscular performance was after giving VT at 35 Hz. Neuromuscular adaptation following high-frequency, low-amplitude 5-week VT training was investigated and revealed no significant improvement in NME through modulation of muscle spindle sensitivity (19).…”

Section: Neuromuscular Efficiencymentioning

confidence: 96%

“…Neuromuscular efficiency (η NME ) propose-d by Milner-Brown et al (38) was modified and a new approach was introduced in an in-house study (39) in which 'endurance time' was taken into account: as a ratio {(force * endurance time)/IEMG}. The effort was calculated according to the force exerted over the endurance time and effort of muscle was calculated according to the integration of EMG signal over endurance time.…”

Section: Formula For Neuromuscular Efficiency (η Nme )mentioning

confidence: 99%

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Effects of Different Vibration Therapy Protocols on Neuromuscular Performance

Mukhtar

Abid

Mohd

2021

Muscle Ligaments and Tendons J

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Background. Vibration Therapy (VT) has been attributed to the reflex activation of alpha motor neurons resulting in improved neuromuscular performance (NP). Objective. Changes in muscular performance after VT was evaluated based on MVC grip strength, grip endurance time at 50% MVC and EMG activities of forearm muscles, viz., flexor digitorum superficialis (FDS); flexor carpi ulnaris (FCU); extensor carpi radialis brevis (ECRB); and extensor carpi ulnaris (ECU) in supine posture. Methods. Eight VT protocols (based on the different combinations of vibration frequency (35 and 45 Hz), amplitude (3 g ± 0.5 g and 9 g ± 0.5 g) and exposure duration (30 and 60 seconds)) were given to the participants for 4 days. Participants were from two groups (56/group): persons with a sedentary lifestyle (SL) and a group of construction workers (CW). Results. VT protocols had a significant effect on MVC grip strength (p < 0.001), grip endurance time (p < 0.05), % normalized EMG rms (p < 0.05) and neuromuscular efficiency (NME) (p < 0.001) in all muscles for both groups. VT protocol E (45 Hz, 3 ± 0.5 g, 30 s) had more positive effects on MVC grip strength for CW and less positive for SL. However, VT protocol B (35 Hz, 3 ± 0.5 g, 60 s) had more positive effects on CW grip endurance time. In addition, the highest increase in NME was found in FDS muscle for VT protocol H (45 Hz, 9 ± 0.5 g, 60 s) (212.8%) in CW and 78.55% in SL. Conclusions. VT protocols B, E, and H may be applied to workers involved in the construction industry. These interventions may improve NME, MVC grip strength, and grip endurance time. Findings may be used to form a clinical VT protocol for patients with weak muscle performances.

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Section: Neuromuscular Efficiencymentioning

confidence: 85%

Section: Neuromuscular Efficiencymentioning

confidence: 96%

Section: Formula For Neuromuscular Efficiency (η Nme )mentioning

confidence: 99%

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Effects of Different Vibration Therapy Protocols on Neuromuscular Performance

Mukhtar

Abid

Mohd

2021

Muscle Ligaments and Tendons J

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“…Each study participant had to squeeze the grip jammer dynamometer to its maximum capacity (twice with a 2-minute rest to record MVC) [15,23] until the effort could not be maintained at the desired level. The Jammer dynamometer (Model: G100; Make: M/s Biometrics Ltd., UK) was directly interfaced with an 8-channel participant unit DataLINK using cable H2000; it was connected to the laptop by a USB1800 connecting lead.…”

Section: Grip Strength and Endurance Time Measurementmentioning

confidence: 99%

“…The mean square root of the EMG signal increases with the intensity of muscular activity and the generation of force [11] with aggravated fatigue [12]. Researchers suggested that the increased recruit-ment of additional Motor Units (MUs) occurs due to a gradual increase in EMG activity [13][14][15]. A multivariate approach to assess fatigue was recommended; this is because multiple EMG features provide more information than a single feature [16].…”

Section: Introductionmentioning

confidence: 99%

Electromyography-based Fatigue Assessment During Endurance Testing by Different Vibration Training Protocols

Alam

Khan

2021

IRJ

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Objectives: This study presents a method of assessing muscle fatigue during endurance testing at 50% maximal voluntary contraction (MVC) using electromyography (EMG) information as indirect indices of fatigability in the forearm muscles, namely, flexor digitorum superficialis (FDS); flexor carpi ulnaris (FCU); extensor carpi ulnaris (ECU) and extensor carpi radialis brevis (ECRB)." This study presents a method of assessing muscle fatigue during endurance testing at 50% maximal voluntary contraction (MVC) using electromyography (EMG) information as indirect indices of fatigability in the forearm muscles, namely, flexor digitorum superficialis (FDS); flexor carpi ulnaris (FCU); extensor carpi ulnaris (ECU) and extensor carpi radialis brevis (ECRB). Methods: A randomized comparative experimental design was used during endurance test with 8 VT protocols; based on different combinations of vibration frequency (35 & 45 Hz), amplitude (3±0.5g & 9±0.5g), and exposure duration (30 & 60 seconds), i.e., were given to the study participants for 4 days. A random sampling of participants was conducted from two groups (n=56/group), as follows: individuals with a Sedentary Lifestyle (SL) and a group of Construction Workers (CW). Results: Multivariate Analysis of Variance (MANOVA) results indicated a significant increase in EMG rms, median frequency, waveform length, mean absolute value (P<0.001), and the variance of EMG signal (P<0.05) (except in ECU for the SL group and ECRB for the CW group on the variance of EMG signal) after VT in all muscles of both research groups. Therefore, an increase in the EMG parameter value after a grip endurance task revealing an elevation in EMG signal amplitude is indicative of muscle fiber fatigue. Furthermore, the strongest correlation was found between grip endurance and WL (r=0.471, P<0.001), and EMG rms (r=0.401, P<0.001) of the ECU muscle in the SL group only. Discussion: The patterns of EMG signal represented the amplitude and spectral parameters of the signal, enabling real-time fatigue analysis. Additionally, surface EMG information is useful for indirectly evaluating performance fatigue during the endurance test.

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Contextualising statistical evaluations of pinch force and endurance among young and elderly people using TRIZ techniques

Jee

Kamat

et al. 2021

Australian Journal of Mechanical Engineering

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Effects of vibration therapy on neuromuscular efficiency & features of the EMG signal based on endurance test

Cited by 16 publications

References 53 publications

Effects of Different Vibration Therapy Protocols on Neuromuscular Performance

Effects of Different Vibration Therapy Protocols on Neuromuscular Performance

Electromyography-based Fatigue Assessment During Endurance Testing by Different Vibration Training Protocols

Contextualising statistical evaluations of pinch force and endurance among young and elderly people using TRIZ techniques

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