Muscle Fiber Conduction Velocity During Electrically Stimulated Contraction at Various Joint Angles, During Joint Movements, and During Voluntary Contractions
This study aimed to investigate MFCV during electrically evoked contraction at different joint angles, during joint movements, and during voluntary contractions. Sixteen healthy young men participated. A stimulation electrode was attached on the innervation zone of the vastus lateralis, and a linear electrode array was attached on the vastus lateralis. Under a static condition, electrically evoked electromyography signals were recorded at knee joint angles set every 15° between 0° and 105°. Under a passive movement condition, signals were recorded during knee extension and flexion passively. Under a voluntary contractio...
Source: Journal of Applied Biomechanics - September 7, 2023 Category: Sports Medicine Authors: Tetsuya Hirono Kohei Watanabe Source Type: research
Walking Kinematic Coordination Becomes More In-Phase at Extreme Inclines
J Appl Biomech. 2023 Sep 4:1-9. doi: 10.1123/jab.2021-0263. Online ahead of print.ABSTRACTPrevious research has shown that there are differences in mechanical energy, kinematics, and muscle activation when comparing walking on level and incline surfaces, especially on inclines above 15%. Muscle activations are significantly different while walking on extreme inclines, suggesting a different coordination pattern. We utilized continuous relative phase to assess walking kinematic coordination with respect to increased incline angles. Twelve healthy, college-aged individuals walked for 7 inclines of 1 minute each on a motorize...
Source: Journal of Applied Biomechanics - September 4, 2023 Category: Sports Medicine Authors: Alexis D Gidley Joshua P Bailey Source Type: research
Multifidus Denervation After Radiofrequency Ablation of the Medial Nerve Alters the Biomechanics of the Spine-A Computational Study
This study aims to quantify changes in joint angles and loading caused by multifidus denervation after radiofrequency ablation. AnyBody model of the torso was used to evaluate intervertebral joints in flexion, lateral bending, and torsion. Force-dependent kinematics was used to calculate joint angles and forces. These dependent variables were investigated in intact multifidus, unilateral, and bilateral ablations of L3L4, L4L5, and L5S1 joints. The results showed pronounced angular joint changes, especially in bilateral ablations in flexion, when compared with other cases. The same changes' trend from intact to unilaterally...
Source: Journal of Applied Biomechanics - August 29, 2023 Category: Sports Medicine Authors: Faris A Almalki Daniel H Cortes Source Type: research
