Entrainment of vastus medialis complex activity differs between genders. Issue 4 (29th December 2015)

• Record Type: Journal Article
• Authors: Tenan, Matthew S.; Hackney, Anthony C.; Griffin, Lisa
• Is Part Of: Muscle & nerve. Volume 53:Issue 4(2016)
• Page Start: 633
• Page End: 640
• Publication Date: 2015-12-29
• Subjects: gender differences -- knee -- menstrual cycle -- motor unit -- quadriceps -- vastus medialis oblique; Neuromuscular diseases -- Periodicals; Muscles -- Periodicals; Nerves -- Periodicals; 616.74
• DOI: 10.1002/mus.24897
• Languages: English
• ISSNs: 0148-639X

Abstract

ABSTRACT: Introduction : That the vastus medialis oblique (VMO) is a functional unit of the vastus medialis (VM) is disputed. Delayed VMO activation predicts patellofemoral pain, which has higher rates in women. Methods : Single MUs and surface electromyogram (EMG) were collected from the VMO and VM of 9 men and 9 women. Men were tested once; women were tested during 5 menstrual phases. Coherence was assessed for motor unit (MU) firings within and between the VM and VMO using multilevel logistic models to determine statistical significance. Results : Compared with women, men have 741% (MU pairs) and 256% (MU‐EMG pairs) greater odds of common drive (0–5 Hz ) coherent oscillations. MU pairs from the VMO and the dual VM/VMO complex have 228% and 212% greater odds of coherent oscillations in the beta band (15–35 Hz ) compared with VM pairs. Conclusions : The VM and VMO are neurologically different muscles; control of the VM complex is sexually dimorphic. Muscle Nerve 53 : 633–640, 2016