Longer Electromechanical Delay Impairs Hamstrings Explosive Force versus Quadriceps

Electromechanical Delay of the Knee Flexor Muscles After Harvesting the Hamstrings for Anterior Cruciate Ligament Reconstruction

Quadriceps and hamstrings fatigue alters hip and knee mechanics.

Neuromuscular fatigue exacerbates abnormal landing strategies, which may increase noncontact anterior cruciate ligament (ACL) injury risk. The synergistic actions of quadriceps and hamstrings (QH) muscles are central to an upright landing posture, though the precise effect of simultaneous fatigue of these muscles on landing and ACL injury risk is unclear. Elucidating neuromechanical responses t...

Quadriceps and hamstrings muscle dysfunction after total knee arthroplasty.

BACKGROUND/RATIONALE Although TKA reliably reduces pain from knee osteoarthritis, full recovery of muscle strength and physical function to normal levels is rare. We presumed that a better understanding of acute changes in hamstrings and quadriceps muscle performance would allow us to enhance early rehabilitation after TKA and improve long-term function. QUESTIONS/PURPOSES The purposes of thi...

Effect of local fatigue of quadriceps and hamstrings on knee joint proprioception in healthy women

Abstract Objective: proprioception is part of the body's sensory system who is responsible for collecting information for the central nervous system to inform about the status of different parts of the body relative to each other Fatigue can causes disorder in the proprioception. In this research, the effect of quadriceps and hamstrings muscles fatigue on knee proprioceptive function in healt...

Detection of the electromechanical delay and its components during voluntary isometric contraction of the quadriceps femoris muscle

Electromechanical delay (EMD) was described as a time elapsed between first trigger and force output. Various results have been reported based on the measurement method with observed inconsistent results when the trigger is elicited by voluntary contraction. However, mechanomyographic (MMG) sensor placed far away on the skin from the contracting muscle was used to detect muscle fiber motion and...