Performance Fatigability and Neuromuscular Responses Are Not Joint Angle Specific Following a Sustained Isometric Forearm Flexion Task Anchored to a High Perceptual Intensity in Women

Authors

Jocelyn E. Arnett, University of Nebraska - LincolnFollow
Robert W. Smith, University of Nebraska – Lincoln
Tyler J. Neltner, University of Nebraska - LincolnFollow
John Paul V. Anders, The Ohio State University
Dolores G. Ortega, University of Nebraska - LincolnFollow
Terry J. Housh, University of Nebraska - LincolnFollow
Richard J. Schmidt, University of Nebraska – LincolnFollow
Glen O. Johnson, University of Nebraska-LincolnFollow

Date of this Version

7-31-2023

Citation

J Musculoskelet Neuronal Interact 2023; 23(3):299-307.

Comments

Used by permission.

Abstract

Objectives: To examine the effects of joint angle (JA) on maximal voluntary isometric contractions (MVIC) and neuromuscular responses following a sustained, isometric forearm flexion task anchored to a rating of perceived exertion (RPE) of 8 (RPE=8). Methods: Nine women (age: 20.7±2.9 yrs; height: 168.8±7.2 cm; body mass: 66.3±6.8 kg) performed 2,3s forearm flexion MVICs at JAs of 75°, 100°, and 125° prior to and following a sustained, isometric forearm flexion task anchored to RPE=8 to task failure (torque reduced to zero) at JA100. Electromyographic (EMG) and mechanomyographic (MMG) signals were recorded from the biceps brachii. Results: The MVIC at JA100 (collapsed across Time) was significantly greater (pppp>0.05) differences between Time or JAs. Pre-test neuromuscular efficiency (normalized MVIC/normalized EMG AMP) was significantly greater (p=0.005) than post-test. Conclusion: Following a sustained, isometric forearm flexion task anchored to RPE=8 at JA100, the fatigue-induced MVIC and neuromuscular responses were not affected by JA.