Objective: To evaluate the influence of the frequency, the weight and the motion angle on the stress and the fatigue of the forearm extensors in repetitive wrist extending at low force loading level with surface electromyography (SEMG).
Methods: Sixteen male college student volunteers were recruited for the experiment. Eight tasks of wrist extending were performed for 20 minutes respectively in given weight (1.96, 4.90 N), frequency (8.0, 33.3 moves/minute) and motion angle (45 degrees, 90 degrees). The static wrist extending at the level of 20% maximum voluntary contraction (MVC) were performed before and after each task for 2 up to 3 seconds, and the SEMG signals of extensor carpi ulnaris muscle (ECU) and extensor digitorum (ED) were recorded and analyzed.
Results: The weight loading level was approximately equal to 1.40% or 3.50% of the MVC force. The mean power frequency (MPF) and the median frequency (MF) were decreased with the increase of 3 kinds of loading levels. The decrease of MPF of the muscle ED was significant (P < 0.05 or P < 0.01). The MF was decreased with the increase of angle and weight loading levels (P < 0.05 or P < 0.01). The root mean square (RMS) value of SEMG could be divided into 3 or 4 groups with significant difference. All three kinds of loads had positive correlation with amplitude of SEMG according to the stepwise regression analysis.
Conclusion: The fatigue level of ED is the highest. The primary load factor for the forearm extensors is the frequency followed by the weight and the angle. MF, MPF and RMS can be used as sensitive indexes for evaluating the stress and the fatigue of the forearm extensors during repetitive performance at lower force loading level.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Effects of forearm rotation on wrist flexor and extensor muscle activities.
J Orthop Surg Res
January 2025
Department of Orthopedic Surgery, Tokyo Medical University Ibaraki Medical Center, Ami-Town, Ibaraki-Pref., Japan.
The forearm muscles coordinately control wrist motion, and their activity is affected by forearm rotation. Although forearm rotation has been implicated in the development of lateral and medial epicondylitis, its biomechanical background remains unknown. Therefore, the present study investigated the activity of wrist muscles in various forearm positions.
View Article and Find Full Text PDFA Case of Ramipril-Induced Angioedema and Solar Purpura.
Adv Skin Wound Care
January 2025
In the Department of Dermatology, Faculty of Medicine, Sakarya University, Turkey, Rabia Oztas Kara, MD, is Assistant Professor and Bahar Sevimli Dikicier, MD, is Associate Professor. In the Department of Pathology, Bilge Elcin, MD, is Specialist.
This case report describes a patient who developed solar purpura after treatment for angioedema associated with ramipril, an angiotensin-converting enzyme inhibitor. The patient presented to the ED with angioedema. She had been using ramipril for 2 years.
View Article and Find Full Text PDFMRI grading using the neuropathy score-reporting and data system with electrodiagnostic correlation in radial neuropathy around the elbow: a 13-year retrospective review.
Skeletal Radiol
January 2025
Department of Radiology, NYU Langone Orthopedic Hospital, 301 East 17Th Street, 6Th Floor, Radiology , New York, NY, 10003, USA.
Objective: To evaluate the Neuropathy Score-Reporting and Data System (NS-RADS) MRI grading system in conjunction with electrodiagnostic (EDx) testing for radial neuropathy at the elbow.
Materials And Methods: Patients presenting between 2010 and 2023 with suspected radial neuropathy who underwent both EDx testing in the form of electromyography and nerve conduction studies and MRI within a 12-month period were evaluated. Three blinded radiologists used the NS-RADS grading system to evaluate nerve entrapment (E grades), muscle denervation (M grades) proximally within the supinator/extensor carpi radialis brevis (ECRB), and more distally within the forearm extensor muscles.
Extensor tendon injuries are commonly encountered after trauma. These injuries often result in acute weakness and have widely differing treatment options depending on the severity and the location of the injury within the upper extremity. Zone I injuries can often be treated nonoperatively with the potential for pinning of any large bony avulsion fragments.
View Article and Find Full Text PDFAltered anconeus muscle activation characteristics during isometric gripping in individuals with lateral elbow tendinopathy compared to age- and sex-matched control.
J Shoulder Elbow Surg
December 2024
School of Health Sciences and Social Work, Griffith University, Australia.
Article Synopsis
- This study explored how the anconeus muscle activates during gripping in individuals with Lateral Epicondyle Tendinopathy (LET), who often experience pain and weakened grip.
- Participants with LET showed increased activation of the anconeus compared to forearm muscles during gripping, indicating a possible compensatory mechanism.
- Understanding these changes in muscle activation can help explain the gripping difficulties associated with LET and may lead to better treatment strategies.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!