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

2021 ◽  
Vol 19 (1) ◽  
pp. 85-98
Author(s):  
Mohd Mukhtar Alam ◽  
◽  
Abid Ali Khan ◽  
Keyword(s):  
Maximal Voluntary Contraction ◽  
Voluntary Contraction ◽  
Flexor Digitorum Superficialis ◽  
Endurance Test ◽  
Emg Signal ◽  
Flexor Carpi Ulnaris ◽  
Endurance Testing ◽  
Flexor Digitorum ◽  
Extensor Carpi Radialis ◽  
Grip Endurance

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.

scholarly journals Bilateral Variation of Forearm Flexor Muscles - A Case Report and Clinical Significance

2012 ◽  
Vol 01 (01) ◽  
pp. 040-043
Author(s):  
D. Malar ◽  
Keyword(s):  
Middle Finger ◽  
Flexor Digitorum Profundus ◽  
Flexor Digitorum Superficialis ◽  
Flexor Carpi Ulnaris ◽  
Close Proximity ◽  
Flexor Muscles ◽  
Male Cadaver ◽  
Forearm Flexor Muscles ◽  
Flexor Digitorum ◽  
Forearm Flexor

AbstractDuring routine dissection, bilateral multiple variations of forearm flexor muscles were observed in a male cadaver. The variations were a) an additional belly arising from the coronoid process of ulna, distal to the origin of ulnar head of flexor digitorum superficialis, passing deep to flexor digitorum superficialis and joining the tendon of flexor digitorum profundus to the middle finger; b) an additional belly arising from the distal part of flexor carpi ulnaris and passing superficial to ulnar nerve and ulnar vessels in the Guyon's canal and c) the origin of second lumbricals from the profundus tendon in the carpal tunnel. An aberrant muscle may stimulate a ganglion or a soft tissue tumor or if in close proximity to a nerve, it may cause pressure neuritis. Identification of these variations is important in defining the anatomical features for clinical diagnosis and surgical procedures.

scholarly journals Assessing the Therapeutic Effect of 630 nm Light-Emitting Diodes Irradiation on the Recovery of Exercise-Induced Hand Muscle Fatigue with Surface Electromyogram

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Dandan Yang ◽  
Xiaoying Wu ◽  
Wensheng Hou ◽  
Xiaolin Zheng ◽  
Jun Zheng ◽  
...  
Keyword(s):  
Muscle Fatigue ◽  
Light Emitting Diode ◽  
Voluntary Contraction ◽  
Control Group ◽  
Flexor Digitorum Superficialis ◽  
Light Emitting ◽  
Hand Muscle ◽  
Exercise Induced ◽  
Flexor Digitorum ◽  
And Control

This paper aims to investigate the effect of light emitting diode therapy (LEDT) on exercise-induced hand muscle fatigue by measuring the surface electromyography (sEMG) of flexor digitorum superficialis. Ten healthy volunteers were randomly placed in the equal sized LEDT group and control group. All subjects performed a sustained fatiguing isometric contraction with the combination of four fingertips except thumb at 30% of maximal voluntary contraction (MVC) until exhaustion. The active LEDT or an identical passive rest therapy was then applied to flexor digitorum superficialis. Each subject was required to perform a re-fatigue task immediately after therapy which was the same as the pre-fatigue task. Average rectified value (ARV) and fractal dimension (FD) of sEMG were calculated. ARV and FD were significantly different between active LEDT and passive rest groups at 20%–50%, 70%–80%, and 100% of normalized contraction time (P<0.05). Compared to passive rest, active LEDT induced significantly smaller increase in ARV values and decrease in FD values, which shows that LEDT is effective on the recovery of muscle fatigue. Our preliminary results also suggest that ARV and FD are potential replacements of biochemical markers to assess the effects of LEDT on muscle fatigue.

scholarly journals Unilateral accessory muscles of forearm-and its clinical implications

2017 ◽  
Vol 8 (2) ◽  
pp. 94-96
Author(s):  
Kosuri Kalyan Chakravarthi
Keyword(s):  
Dorsal Surface ◽  
Soft Tissue Tumour ◽  
Flexor Digitorum Superficialis ◽  
Accessory Muscle ◽  
Medial Side ◽  
Tissue Tumour ◽  
Longus Muscle ◽  
Extensor Compartment ◽  
Flexor Digitorum ◽  
Extensor Carpi Radialis

An accessory or aberrant musculature may stimulate a ganglion or a soft tissue tumour or if in close proximity to a nerve, it may cause pressure neuritis. Identification of these variations is important in defining the anatomical features for clinical diagnosis and surgical procedures. During routine cadaveric dissection of the forearm in the department of anatomy, we observed an accessory muscle in the flexor compartment and additional extensor carpi radialis longus muscle in the extensor compartment of the forearm in left upper limb of a middle aged female cadaver. The accessory muscle belly has taken its tendinous origin from the medial surface of the ulna deep to the flexor digitorum superficialis and crossed the median nerve from medial to lateral, when traced below in the carpal tunnel it merged with the tendon of the index finger of flexor digitorum superficialis. An additional extensor carpi radialis longus muscle with unusual course of radial nerve in the extensor compartment of the forearm was found on the medial side of brachioradialis and superficial to extensor carpi radialis longus and its tendon ended by getting inserted into the base of the dorsal surface of the second metacarpal bone. Although many anatomical variations of flexor digitorum superficialis and extensor carpi radialis longus muscle were reported in the past, we describe a rare case, first of its kind, which to our knowledge has not been mentioned in the literature till date. Such variations are clinically significant in the anatomical, surgical and radiological procedures. Asian Journal of Medical Sciences Vol.8(2) 2017 94-96

Facilitation from flexor digitorum superficialis to extensor carpi radialis in humans

2016 ◽  
Vol 234 (8) ◽  
pp. 2235-2244 ◽  
Author(s):  
Mitsuhiro Nito ◽  
Wataru Hashizume ◽  
Takuji Miyasaka ◽  
Katsuhiko Suzuki ◽  
Toshiaki Sato ◽  
...  
Keyword(s):  
Flexor Digitorum Superficialis ◽  
Flexor Digitorum ◽  
Extensor Carpi Radialis

Comparative Evaluation of Effectiveness of Different Motor Muscles in Modified Lasso Procedure for Correction of Finger Clawing

2003 ◽  
Vol 28 (6) ◽  
pp. 597-601 ◽  
Author(s):  
G. N. MALAVIYA
Keyword(s):  
Retrospective Study ◽  
Comparative Evaluation ◽  
Flexor Digitorum Superficialis ◽  
Palmaris Longus ◽  
Flexor Digitorum ◽  
Extensor Carpi Radialis

A retrospective study was carried out to compare the effectiveness of different muscles as motors in modified lasso procedures for correction of finger clawing in leprosy. It was observed that palmaris longus and extensor carpi radialis longus were more suitable than the flexor digitorum superficialis. In some patients, removal of superficialis is associated with complications which could not be predicted before surgery. Extensor carpi radialis longus has advantages over palmaris longus in selected cases.

scholarly journals Treatment of Extensor Lag Using the Flexor Digitorum Superficialis after Crushing-Penetrating Injury to the Metacarpophalangeal Joint

2019 ◽  
Vol 11 (03) ◽  
pp. 175-177
Author(s):  
Yoshitaka Hamada ◽  
Emiko Horii ◽  
Hiroyasu Toyama ◽  
Yoshitaka Minamikawa ◽  
Yukiko Kinoshita ◽  
...  
Keyword(s):  
Middle Finger ◽  
Metacarpophalangeal Joint ◽  
Flexor Digitorum Superficialis ◽  
Beneficial Effects ◽  
Alternative Donor ◽  
Palmaris Longus Tendon ◽  
Flexor Digitorum ◽  
Donor Muscle ◽  
Extensor Carpi Radialis ◽  
Extensor Lag

AbstractWe previously reported the beneficial effects of tendon transfer to eliminate extension lag of the interphalangeal joints, using the extensor carpi radialis longus prolonged by palmaris longus tendon grafts after crushing-penetrating injuries around the metacarpophalangeal (MP) joint of the middle finger. We used the flexor digitorum superficialis (FDS) as the alternative donor muscle and treated two cases of severe crushing injuries to MP joint, and then obtained good outcomes.

Transfer of Extensor Carpi Radialis Longus or Brevis for Opponensplasty

1999 ◽  
Vol 24 (1) ◽  
pp. 50-53 ◽  
Author(s):  
G. H. BAEK ◽  
J. M. JUNG ◽  
W. J. YOO ◽  
M. S. CHUNG
Keyword(s):  
Tendon Transfer ◽  
Ring Finger ◽  
The Other ◽  
Flexor Digitorum Superficialis ◽  
Flexor Muscles ◽  
Flexor Digitorum ◽  
Extensor Carpi Radialis

For the restoration of thumb opposition many types of tendon transfer techniques have been described. The flexor digitorum superficialis (FDS) of the ring finger is commonly selected as a motor. On occasion, however, the quality of the flexor muscles of the fingers or wrist is not good enough for tendon transfer and another available muscle must be selected. In this situation, we have preferred to use an extensor carpi radialis longus (ECRL) or brevis (ECRB) transfer to restore opposition of the thumb. Follow-up examination, at an average 5 years and 10 months after operation, showed that the results of ten of 11 transfers were excellent and the other was good.

Assessing Increased Activities of the Forearm Muscles Due to Anti-Vibration Gloves: Construct Validity of a Refined Methodology

2020 ◽  
pp. 001872082094830
Author(s):  
Yumeng Yao ◽  
Subhash Rakheja ◽  
Christian Larivière ◽  
Pierre Marcotte
Keyword(s):  
Construct Validity ◽  
Grip Force ◽  
Manual Dexterity ◽  
Flexor Digitorum Superficialis ◽  
Forearm Muscles ◽  
Bare Hand ◽  
Measurement Protocol ◽  
Flexor Digitorum ◽  
Extensor Carpi Radialis ◽  
Design Guidance

Objective The primary aim was to test the construct validity of a surface electromyography (EMG) measurement protocol, indirectly assessing the effects of anti-vibration (AV) gloves on activities of the forearm muscles. Background AV gloves impose a relatively higher grip demand and thus a higher risk for musculoskeletal disorders. Consequently, activities of the forearm muscles should be considered when assessing AV glove performance. Method Effects of AV gloves on activities of the forearm muscles (ECR: extensor carpi radialis longus; ED: extensor digitorum; FCR: flexor carpi radialis; FDS: flexor digitorum superficialis) were measured via EMG, while gripping a handle with two grip force levels. Fifteen subjects participated with 11 glove conditions, including one with bare hand. Results Activities of ECR, FCR, mean of ECR and FCR (ECR_FCR), and mean of all four muscles were sensitive to wearing gloves. Compared with bare hand, combined ECR_FCR activities increased by 22%–78% (mean = 48%, SD = 28%) with gloves. The correlation coefficient ( r) of ECR_FCR activities with glove thickness and manual dexterity scores were 0.74 ( p < .05) and 0.90 ( p < .001), respectively. Conclusions A refined EMG methodology was the most sensitive to AV gloves with specific forearm muscles (ECR and FCR) and the 50-N handgrip force. Its construct validity was further substantiated by correlations with glove thickness and manual dexterity. Application Assessment of the effect of AV gloves on activities of the forearm muscles can yield design guidance for AV gloves to reduce grip exertion by the gloved hand.

Correction of Ulnar Claw Hand by a Loop of Flexor Digitorum Superficialis Motor for Lumbrical Replacement

1984 ◽  
Vol 9 (2) ◽  
pp. 131-133 ◽  
Author(s):  
ATUL SHAH
Keyword(s):  
Extensor Tendon ◽  
Education And Training ◽  
Fascia Lata ◽  
Flexor Digitorum Superficialis ◽  
Plantaris Tendon ◽  
Palmaris Longus ◽  
Transverse Arch ◽  
Flexor Digitorum ◽  
Extensor Carpi Radialis ◽  
And Training

The current dynamic procedures for correction of ulnar claw hand are extensor carpi radialis longus many tail graft, palmaris longus four finger many tail graft and extensor by pass operation. Each of these procedures takes a minimum of one and a half hours and needs extensive post operative re-education and training. These procedures employ a graft of plantaris tendon, fascia lata or extensor tendon, with the disadvantages of operating at another site and adhesion of grafts. The procedure described in this article obviates these disadvantages. The operation is simple to perform and has given good results even when performed at leprosy camps where no extensive re-education physiotherapy was available. This operation also tends to correct the reversal of transverse arch. The technique and observations are discussed in detail.

Sign in / Sign up

Export Citation Format

Share Document