scholarly journals Applied Force and sEMG Muscle Activity Required To Operate Pistol Grip Control in an Electric Utility Aerial Bucket

2017 ◽  
Vol 61 (1) ◽  
pp. 963-967 ◽  
Author(s):  
Richard W. Marklin ◽  
Jonathon E. Slightam ◽  
Mark L. Nagurka ◽  
Trent M. Wolff ◽  
Casey D. Garces ◽  
...  
Keyword(s):  
Muscle Activity ◽  
Electric Utility ◽  
Applied Force ◽  
The Other ◽  
Flexor Digitorum Superficialis ◽  
Overhead Line ◽  
Flexor Digitorum ◽  
Forearm Muscle ◽  
Semg Activity ◽  
Semg Signals

Electric utility line workers report high levels of fatigue in forearm muscles when operating a conventional pistol grip control in aerial buckets. This study measured the applied force and surface electromyographic (sEMG) signals from four upper extremity muscles required to operate the pistol grip control in two tasks. The first task was movement of the pistol grip in six directions (up/down, forward/rearward, clockwise/counter-clockwise), and the second task was movement of the bucket from its resting position on the truck bed to an overhead conductor on top of a 40 ft tall pole. The force applied to the pistol grip was measured in 14 aerial bucket trucks, and sEMG activity was measured on eight apprentice line workers. The applied force required to move the pistol grip control in the six directions ranged from 12 to 15 lb. The sEMG activity in the extensor digitorum communis (EDC) forearm muscle was approximately twice as great or more than the other three muscles (flexor digitorum superficialis, triceps, and biceps). Line workers exerted 14 to 30% MVCEMG to move the pistol grip in the six directions. Average %MVCEMG of the EDC to move the bucket from the truck platform to an overhead line ranged from 26 to 30% across the four phases of the task. The sEMG findings from this study provide physiologic evidence to support the anecdotal reports of muscle fatigue from line workers after using the pistol grip control for repeated, long durations.

New Pistol Grip Control for an Electric Utility Aerial Bucket Reduces Risk of Forearm Muscle Fatigue

2018 ◽  
Vol 62 (1) ◽  
pp. 888-892
Author(s):  
Richard W. Marklin ◽  
Jonathon E. Slightam ◽  
Mark L. Nagurka ◽  
Casey D. Garces ◽  
Lovely Krishen ◽  
...  
Keyword(s):  
Muscle Fatigue ◽  
Muscular Activity ◽  
Electric Utility ◽  
Scale Model ◽  
Overhead Line ◽  
Endurance Time ◽  
Forearm Muscles ◽  
Actual Equipment ◽  
Forearm Muscle ◽  
Semg Activity

Overhead line workers have anecdotally reported elevated levels of fatigue in forearm muscles when operating the pistol grip control that maneuvers an aerial bucket on a utility truck. Previous research with surface electromyographic (sEMG) recordings of forearm muscles corroborated these reports of muscle fatigue. A new pistol grip was designed that reduces the applied force by 50% in all directions of movement. In laboratory testing, sEMG signals were recorded from the upper extremity muscles of twenty subjects, who operated a conventional-force pistol grip and the 50% reduced-force control to move a 1/15 scale model of an aerial truck boom. The muscle that resulted in the greatest sEMG activity (extensor digitorum communis (EDC)) was the muscle that workers typically pointed to when they reported forearm muscle fatigue from using the control. The reduced-forced pistol grip decreased EDC sEMG by an average of 5.6%, compared to the conventional control, increasing the maximum endurance time by 38% according to muscle fatigue models. This study was the first to quantify muscular activity of a new aerial bucket pistol grip control and the results show promise for improving the occupational health of electric utility overhead line workers, specifically reducing muscle fatigue. Before the new design of the pistol grip can be commercialized, it must be tested in the field on actual equipment.

scholarly journals Recovery and Fatigue Behavior of Forearm Muscles during a Repetitive Power Grip Gesture in Racing Motorcycle Riders

2021 ◽  
Vol 18 (15) ◽  
pp. 7926
Author(s):  
Michel Marina ◽  
Priscila Torrado ◽  
Raul Bescós
Keyword(s):  
Duty Cycle ◽  
Fatigue Behavior ◽  
Median Frequency ◽  
Flexor Digitorum Superficialis ◽  
Muscle Training ◽  
Maximal Voluntary Isometric Contraction ◽  
Power Grip ◽  
Road Racing ◽  
Flexor Digitorum ◽  
Forearm Muscle

Despite a reduction in the maximal voluntary isometric contraction (MVCisom) observed systematically in intermittent fatigue protocols (IFP), decrements of the median frequency, assessed by surface electromyography (sEMG), has not been consistently verified. This study aimed to determine whether recovery periods of 60 s were too long to induce a reduction in the normalized median frequency (MFEMG) of the flexor digitorum superficialis and carpi radialis muscles. Twenty-one road racing motorcycle riders performed an IFP that simulated the posture and braking gesture on a motorcycle. The MVCisom was reduced by 53% (p < 0.001). A positive and significant relationship (p < 0.005) was found between MFEMG and duration of the fatiguing task when 5 s contractions at 30% MVCisom were interspersed by 5 s recovery in both muscles. In contrast, no relationship was found (p > 0.133) when 10 s contractions at 50% MVC were interspersed by 1 min recovery. Comparative analysis of variance (ANOVA) confirmed a decrement of MFEMG in the IFP at 30% MVCisom including short recovery periods with a duty cycle of 100% (5 s/5 s = 1), whereas no differences were observed in the IFP at 50% MVCisom and longer recovery periods, with a duty cycle of 16%. These findings show that recovery periods during IFP are more relevant than the intensity of MVCisom. Thus, we recommend the use of short recovery periods between 5 and 10 s after submaximal muscle contractions for specific forearm muscle training and testing purposes in motorcycle riders.

Incidence of tenolysis and features of adhesions in the digital flexor tendons after multi-strand repair and early active motion

2018 ◽  
Vol 44 (4) ◽  
pp. 354-360 ◽  
Author(s):  
Koji Moriya ◽  
Takea Yoshizu ◽  
Naoto Tsubokawa ◽  
Hiroko Narisawa ◽  
Yutaka Maki
Keyword(s):  
Flexor Tendon ◽  
Full Range ◽  
Tendon Repair ◽  
The Other ◽  
Flexor Digitorum Superficialis ◽  
Flexor Tendon Repair ◽  
Level Of Evidence ◽  
Active Motion ◽  
Active Mobilization ◽  
Flexor Digitorum

We report seven patients requiring tenolysis after primary or delayed primary flexor tendon repair and early active mobilization out of 148 fingers of 132 consecutive patients with Zone 1 or 2 injuries from 1993 to 2017. Three fingers had Zone 2A, two Zone 2B, and two Zone 2C injuries. Two fingers underwent tenolysis at Week 4 or 6 after repair because of suspected repair rupture. The other five fingers had tenolysis 12 weeks after repair. Adhesions were moderately dense between the flexor digitorum superficialis and profundus tendons or with the pulleys. According to the Strickland and Tang criteria, the outcomes were excellent in one finger, good in four, fair in one, and poor in one. Fingers requiring tenolysis after early active motion were 5% of the 148 fingers so treated. Indications for tenolysis were to achieve a full range of active motion in the patients rated good or improvement of range of active motion of the patients rated poor or fair. Not all of our patients with poor or fair outcomes wanted to have tenolysis. Level of evidence: IV

Comparison of Muscle Activity during Use of Computer Pointing Devices in Cad Operators

2000 ◽  
Vol 44 (37) ◽  
pp. 633-636 ◽  
Author(s):  
Pat Tittiranonda ◽  
Bernard Martin ◽  
Stephen Burastero
Keyword(s):  
Muscle Activity ◽  
Index Finger ◽  
Neck Muscles ◽  
Electromyographic Activity ◽  
Flexor Digitorum Superficialis ◽  
Upper Trapezius ◽  
Extensor Indicis Proprius ◽  
Significant Difference ◽  
Experimental Mouse ◽  
Flexor Digitorum

This study examined the use of four different computer pointing devices on surface electromyographic activity of the index finger, forearm and shoulder/neck muscles among CAD operators in the workplace. Subjects were randomly assigned to use their own mouse, a trackball, a joystick mouse or an experimental mouse. Results showed that there was a statistically significant difference in muscle load for the upper trapezius, extensor indicis proprius, and extensor carpi ulnaris across pointing devices for CAD operations. The flexor digitorum superficialis muscle load remained relatively constant when all pointing devices were compared.

One in Four Flexor Digitorum Superficialis Lasso for Correction of the Claw Deformity.

1986 ◽  
Vol 11 (3) ◽  
pp. 404-406
Author(s):  
ATUL SHAH
Keyword(s):  
The Other ◽  
Flexor Digitorum Superficialis ◽  
Power Grip ◽  
One Stage ◽  
Flexor Digitorum ◽  
Swan Neck Deformity ◽  
A1 Pulley

In continuation of the author’s work on ‘lasso’ principle, flexor digitorum superficialis split in to four tails and looped around A1 pulley has been described in this article to correct the ulnar claw and to correct the total claw hand when used along with opponensplasty as a one stage technique. This operation has the advantage of retaining superficialis tendons of the other fingers for better power grip and the avoiding swan neck deformity.

Congenital Absence of Flexor Digitorum Superficialis: Implications for Assessment of Little Finger Lacerations

2010 ◽  
Vol 35 (5) ◽  
pp. 417-418 ◽  
Author(s):  
W.A. Townley ◽  
M.C. Swan ◽  
R.L.R. Dunn
Keyword(s):  
Congenital Anomaly ◽  
The Other ◽  
Congenital Absence ◽  
Reliable Indicator ◽  
Flexor Digitorum Superficialis ◽  
Finger Injuries ◽  
Opposite Hand ◽  
Bilateral Absence ◽  
Flexor Digitorum ◽  
Little Finger

Absence of flexor digitorum superficialis function in the little finger is a relatively common congenital anomaly that can complicate assessment of little finger injuries. We reviewed the prevalence of unilateral and bilateral absence of superficialis function in the published literature. In appropriate studies identified (1352 people), the anomaly was unilateral in 92 individuals (6.8%) and bilateral in 81 (6.0%). If superficialis function is absent in one little finger, the probability of absence in the opposite hand is 0.64. If superficialis function is present, the probability of absence in the other little finger is 0.02 (1 in 50). Absence of little finger superficialis function in one hand is therefore not a reliable indicator of this function in the opposite hand.

The wing muscles of the American coot (Fulica americana Gmelin)

1980 ◽  
Vol 58 (10) ◽  
pp. 1758-1773 ◽  
Author(s):  
Benjamin W. C. Rosser
Keyword(s):  
Biceps Brachii ◽  
Gross Anatomy ◽  
The Other ◽  
Flexor Digitorum Superficialis ◽  
Fulica Americana ◽  
Flexor Digitorum ◽  
American Coot

The gross anatomy of all wing muscles of the American coot (Fulica americana Gmelin) is described. A number of myological features distinguish the rallids from the other gruiforms studied to date: the presence of M. subcoracoideus caput dorsale, the insertion of M. flexor digitorum superficialis on Phalanx proximalis digiti majoris, the presence of a deep belly of M. expansor secundariorum, and the origin of M. expansor secundariorum tendo proximalis from a small craniomedial tubercle on the scapula. Unique to F. americana, within the gruiforms studied, M. biceps brachii pars propatagialis attaches to both Tendo longa and Tendo brevis of M. tensor propatagialis.

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.

scholarly journals Automatic analysis of muscular activity in the flexor digitorum superficialis muscles: A fast screening method for rapid eye movement sleep without atonia

SLEEP ◽  
2022 ◽  
Author(s):  
Matteo Cesari ◽  
Anna Heidbreder ◽  
Carles Gaig ◽  
Melanie Bergmann ◽  
Elisabeth Brandauer ◽  
...  
Keyword(s):  
Eye Movement ◽  
Rem Sleep ◽  
Muscle Activity ◽  
Screening Method ◽  
Muscular Activity ◽  
Apnea Hypopnea Index ◽  
Flexor Digitorum Superficialis ◽  
Rapid Eye Movement ◽  
Artifact Correction ◽  
Flexor Digitorum

Abstract Study objectives To identify a fast and reliable method for rapid eye movement (REM) sleep without atonia (RWA) quantification. Methods We analyzed 36 video-polysomnographies (v-PSGs) of isolated REM sleep behavior disorder (iRBD) patients and 35 controls’ v-PSGs. Patients diagnosed with RBD had: i) RWA, quantified with a reference method, i.e. automatic and artifact-corrected 3-s Sleep Innsbruck Barcelona (SINBAR) index in REM sleep periods (RSPs, i.e. manually selected portions of REM sleep); and ii) v-PSG-documented RBD behaviors. We quantified RWA with other (semi)-automated methods requiring less human intervention than the reference one: the indices proposed by the SINBAR group (the 3-s and 30-s phasic flexor digitorum superficialis (FDS), phasic/”any”/tonic mentalis), and the REM atonia, short and long muscle activity indices (in mentalis/submentalis/FDS muscles). They were calculated in whole REM sleep (i.e. REM sleep scored following international guidelines), in RSPs, with and without manual artifact correction. Area under curves (AUC) discriminating iRBD from controls were computed. Using published cut-offs, the indices’ sensitivity and specificity for iRBD identification were calculated. Apnea-hypopnea index in REM sleep (AHIREM) was considered in the analyses. Results RWA indices from FDS muscles alone had the highest AUCs and all of them had 100% sensitivity. Without manual RSP selection and artifact correction, the “30-s phasic FDS” and the “FDS long muscle activity” had the highest specificity (85%) with AHIREM&lt;15/h. RWA indices were less reliable when AHIREM≥15/h. Conclusions If AHIREM&lt;15/h, FDS muscular activity in whole REM sleep and without artifact correction is fast and reliable to rule out RWA.

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