biostudies-literatureUnknown19(4)Einarsson E<h4>Background</h4>After Anterior Cruciate Ligament Reconstruction (ACLR) athletes face the challenge of regaining their previous competitive level while avoiding re-injury and early knee joint cartilage degeneration. Quadriceps and hamstrings strength reductions and neuromuscular alterations potentially related to risk of re-injury are present after ACLR and relate to deficits in muscle activation.<h4>Design</h4>Cross-sectional laboratory study.<h4>Purpose</h4>To examine quadriceps and hamstrings muscle activation during repeated hops in healthy pivoting-sport athletes and those who had undergone ACLR (bone-tendon-bone and semitendinosus graft) who had met functional criteria allowing return to training.<h4>Methods</h4>Surface electromyography (SEMG) was recorded from vastus medialis and International journal of sports physical therapy418-428https://www.ebi.ac.uk/biostudies/studies/S-EPMC10987308biostudies-literatureQuadriceps and Hamstrings Activation Peaks Earlier as Athletes Repeatedly Hop, but There are Differences Depending on ACL Reconstruction Technique.PMC10987308Gislason MKWhiteley RBarbosa OEinarsson EBriem KKotsifaki AfalseQuadriceps and Hamstrings Activation Peaks Earlier as Athletes Repeatedly Hop, but There are Differences Depending on ACL Reconstruction Technique.<h4>Background</h4>After Anterior Cruciate Ligament Reconstruction (ACLR) athletes face the challenge of regaining their previous competitive level while avoiding re-injury and early knee joint cartilage degeneration. Quadriceps and hamstrings strength reductions and neuromuscular alterations potentially related to risk of re-injury are present after ACLR and relate to deficits in muscle activation.<h4>Design</h4>Cross-sectional laboratory study.<h4>Purpose</h4>To examine quadriceps and hamstrings muscle activation during repeated hops in healthy pivoting-sport athletes and those who had undergone ACLR (bone-tendon-bone and semitendinosus graft) who had met functional criteria allowing return to training.<h4>Methods</h4>Surface electromyography (SEMG) was recorded from vastus medialis and 2024-01-01T00:00:00Z20242026-03-16T04:43:57.588Z2025-08-15T03:06:10.966ZS-EPMC109873083857683710.26603/001c.94610