title: Knee joint angle and vasti muscle electromyograms during fatiguing contractions.
abstract: We compared vasti muscle electromyograms for two knee joint angles during fatiguing tetanic contractions. Tetanic contraction of the knee extensors was evoked for 70 s by electrical stimulation of the femoral nerve at knee joint angles of 60° (extended, with 0° indicating full extension) and 110° (flexed) in eight healthy men. Surface electromyography was recorded from the vastus intermedius (VI), vastus lateralis (VL) and vastus medialis (VM) muscles. Knee extension force and M-wave amplitudes and durations were calculated every 7 s, which were normalized by the initial value. Normalized knee extension force was decreased at the flexed knee joint angle compared with that of the extended knee joint angle (P<0·05). Decreased normalized M-wave amplitude and increased normalized M-wave duration of the VI were greater at the flexed knee joint angle than the extended knee joint angle (P<0·05), whereas those for the VL and VM were similar (P>0·05). These results suggest that peripheral fatigue profiles of the VI might be greater at the flexed than the extended knee joint angles, but that of VL and VM might be similar in the tested range of knee joint angles (i.e. 60°-110°) during continuous tetanic contraction induced by electrical stimulation. Therefore, greater reduction of knee extension force at the flexed knee joint angle than the extended knee joint angle may reflect fatigue development of the VI more than other quadriceps femoris components.
authors.affiliation: Graduate School of Education and Human Development, Nagoya University, Nagoya, Japan.|Japan Society for the Promotion of Science, Nagoya, Japan.
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Ando
authors.affiliation: Graduate School of Education and Human Development, Nagoya University, Nagoya, Japan.
authors.forename: Aya
authors.initials: A
authors.lastname: Tomita
authors.affiliation: School of International Liberal Studies, Chukyo University, Nagoya, Japan.
authors.forename: Kohei
authors.initials: K
authors.lastname: Watanabe
authors.affiliation: Graduate School of Education and Human Development, Nagoya University, Nagoya, Japan.|Research Center of Health, Physical Fitness & Sports, Nagoya University, Nagoya, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Akima
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D004558:Electric Stimulation; D004576:Electromyography; D064368:Healthy Volunteers; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D009119:Muscle Contraction; D018763:Muscle Fatigue; D053580:Muscle Strength; D052097:Quadriceps Muscle / Q000502:physiology*; D016059:Range of Motion, Articular; D013997:Time Factors; D055815:Young Adult
keywords: M-wave; fatigue; muscle length; tetanic contractions; vastus intermedius