title: Range of motion and leg rotation affect electromyography activation levels of the superficial quadriceps muscles during leg extension.
abstract: Leg extension (LE) is commonly used to strengthen the quadriceps muscles during training and rehabilitation. This study examined the effects of limb position (POS) and range of motion (ROM) on quadriceps electromyography (EMG) during 8 repetitions (REP) of LE. Twenty-four participants performed 8 LE REP at their 8 repetition maximum with lower limbs medially rotated (TI), laterally rotated (TO), and neutral (NEU). Each REP EMG was averaged over the first, middle, and final 0.524 rad ROM. For vastus medialis oblique (VMO), a REP × ROM interaction was detected (p < 0.02). The middle 0.524 rad produced significantly higher EMG than the initial 0.524 rad for REP 6-8 and the final 0.524 rad produced higher EMG than the initial 0.524 rad for REP 1, 2, 3, 4, 6, and 8 (p ≤ 0.05). For rectus femoris (RF), EMG activity increased across REP with TO generating the greatest activity (p < 0.001). For vastus lateralis (VL), EMG increased across REP (p < 0.001) with NEU and TO EMG increasing linearly throughout ROM and TI activity greatest during the middle 0.524 rad. We conclude that to target the VMO, the optimal ROM is the final 1.047 rad regardless of POS, while maximum EMG for the RF is generated using TO regardless of ROM. In contrast, the VL is maximally activated using TI over the first 1.047 rad ROM or in NEU over the final 0.524 rad ROM.
authors.affiliation: 1Department of Kinesiology and Sport Sciences, University of Miami, Coral Gables, Florida; 2Associate Faculty, Center on Aging, Miller School of Medicine, University of Miami, Miami, Florida; Departments of 3Epidemiology and Public Health; and 4Family Medicine and Community Health, Miller School of Medicine, University of Miami, Miami, Florida; 5Department of Psychiatry & Behavioral Sciences and Associate Director of the Medical Wellness Center, Miller School of Medicine, University of Miami, Miami, Florida; and 6American International Group, New York, New York.
authors.forename: Joseph F
authors.initials: JF
authors.lastname: Signorile
authors.forename: Karen M
authors.initials: KM
authors.lastname: Lew
authors.forename: Mark
authors.initials: M
authors.lastname: Stoutenberg
authors.forename: Alessandra
authors.initials: A
authors.lastname: Pluchino
authors.forename: John E
authors.initials: JE
authors.lastname: Lewis
authors.forename: Jinrun
authors.initials: J
authors.lastname: Gao
mesh_terms: D000328:Adult; D004576:Electromyography; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000502:physiology; D007866:Leg / Q000502:physiology; D008297:Male; D011187:Posture; D052097:Quadriceps Muscle / Q000502:physiology*; D016059:Range of Motion, Articular / Q000502:physiology*; D055070:Resistance Training; D012399:Rotation; D055815:Young Adult