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.

Flexor digitorum profundus with or without flexor digitorum superficialis tendon repair in acute Zone 2B injuries

2020 ◽  
Vol 45 (10) ◽  
pp. 1034-1044
Author(s):  
Ahmed F. Sadek
Keyword(s):  
Tendon Repair ◽  
Flexion Contracture ◽  
Flexor Digitorum Profundus ◽  
Flexor Digitorum Superficialis ◽  
Level Of Evidence ◽  
Power Grip ◽  
Contralateral Hand ◽  
Flexor Digitorum ◽  
Flexor Digitorum Profundus Tendon

A total of 53 patients with complete cuts of two flexor tendons in Zone 2B treated over a 9-year period was reviewed. Twenty-three patients (28 fingers) had only flexor digitorum profundus repair, while 30 patients (36 fingers) had both flexor digitorum profundus and flexor digitorum superficialis repairs, with a mean follow-up of 21 months (range 12–84). The decision to repair the flexor digitorum superficialis was made according to intraoperative judgement of ease of repair and gliding of the flexor digitorum profundus tendon. Two groups of patients showed no significant differences in total range of active or passive digital motion and power grip percentage to the contralateral hand. However, the values of power grip were statistically superior in the patients with both tendons repaired. The patients after flexor digitorum profundus-only repairs showed significantly greater but still mild flexion contracture (mean 20 °) of the operated digits. The Tang gradings were the same with 89% good and excellent rates in both groups. The conclusion is that although repair of both flexor digitorum profundus and flexor digitorum superficialis tendons is slightly more preferable based on increased grip strength, the repair of the flexor digitorum superficialis together with flexor digitorum profundus is not mandatory. Whether or not to repair flexor digitorum superficialis is an intraoperative decision based on the ease of gliding of the repaired tendon(s). Level of evidence: III

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.

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.

Consequences of Repetitive Toenail Cutting by Podiatric Physicians on Force Production, Endurance to Fatigue, and the Electromyogram of the Flexor Digitorum Superficialis Muscles

2014 ◽  
Vol 104 (5) ◽  
pp. 486-492 ◽  
Author(s):  
Bruno Vie ◽  
Remy Loffredo ◽  
Farid Sanahdji ◽  
Jean-Paul Weber ◽  
Yves Jammes
Keyword(s):  
Power Spectra ◽  
Force Production ◽  
Median Frequency ◽  
Mean Square ◽  
Flexor Digitorum Superficialis ◽  
Isometric Handgrip ◽  
Time Index ◽  
Tension Time ◽  
Post Tetanic Potentiation ◽  
Flexor Digitorum

Background We hypothesized that the repetitive use of a toenail clipper by podiatric physicians could induce fatigue of the flexor digitorum superficialis (FDS) muscle, reducing the accuracy of toenail cutting. Methods We examined the consequences of cutting a plastic sheet, reproducing the resistance of thick toenails, with a podiatric medical clipper on the maximal handgrip force (Fmax) developed by the FDS muscle and an isometric handgrip sustained at 50% of Fmax, during which endurance to fatigue and changes in the power spectra of the surface FDS muscle electromyogram (root mean square and median frequency) were measured. The same participants randomly performed one or five runs of 30 successive cuttings, each on different days. Results After the first and fifth cutting runs, Fmax increased, suggesting a post-tetanic potentiation. During the handgrip sustained at 50% of Fmax, we measured a significant reduction in the tension-time index after the first cutting run. Moreover, after the fifth cutting run, the tension-time index decrease was significantly accentuated, and the decrease in FDS muscle median frequency was enhanced. No median frequency decline was measured during the cutting runs. Conclusions These results suggest that the efficacy of occupational podiatric medical tasks progressively declines with the repetition of toenail cutting. We propose solutions to remedy this situation.

The anatomy and function of a bilateral accessory flexor digitorum superficialis muscle: A case report and review of literature

Morphologie ◽  
2020 ◽  
Vol 104 (347) ◽  
pp. 287-292
Author(s):  
M. Maniglio ◽  
C.E. Chalmers ◽  
G. Thürig ◽  
C. Passaplan ◽  
C. Müller ◽  
...  
Keyword(s):  
Case Report ◽  
Flexor Digitorum Superficialis ◽  
Review Of Literature ◽  
And Function ◽  
Flexor Digitorum

Claw-finger Correction in Leprosy Using Half of the Flexor Digitorum Superficialis

2008 ◽  
Vol 33 (4) ◽  
pp. 494-500 ◽  
Author(s):  
T. S. NARAYANAKUMAR
Keyword(s):  
Comparative Study ◽  
Surgical Procedures ◽  
Middle Finger ◽  
Flexor Digitorum Superficialis ◽  
Conventional Procedure ◽  
Paralytic Deformity ◽  
Flexor Digitorum

The commonest paralytic deformity in leprosy is the claw deformity of the fingers. Many surgical procedures have been described and are practiced to correct this deformity, but none is free from complications. A modification of the Zancolli lasso operation in which only half of the flexor digitorum superficialis tendon of the middle finger was used as the motor is described and a comparative study of this and the conventional procedure was carried out in 70 hands in 70 patients. The results suggest that the modification is technically simpler, with comparable results to those of the conventional procedure and fewer complications.

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