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The effect of movement velocity and movement pattern on the reciprocal co-activation of the hamstrings.
Electromyogr Clin Neurophysiol. 2003 Dec; 43(8):451-8.EC

Abstract

The effect of velocity and movement pattern (reciprocal vs. non-reciprocal) on the reciprocal co-activation of the hamstrings was investigated through analysis of the root mean square (RMS) and the median frequency (MDF) of surface electromyography (SEMG). Fourteen subjects performed six continuous repetitions of a reciprocal isokinetic movement pattern (maximal extension followed by maximal flexion), and six continuous repetitions of a non-reciprocal movement pattern (maximal extension only) at 100 degrees, 200 degrees, 300 degrees s-1, and 400 degrees s-1. Data were analyzed using separate 2 x 4 (movement pattern x angular velocity) repeated measures analysis of variance (ANOVA). No significant differences (p > 0.05) were noted between reciprocal and non-reciprocal movement patterns for RMS. However, results did reveal a velocity effect for RMS (F = 5.0, p < 0.01), with significant differences observed between 100 degrees s-1 and 400 degrees s-1 (F = 9.4, p < 0.01), 200 degrees s-1 and 400 degrees s-1 (F = 9.5, p < 0.01), and 300 degrees s-1 and 400 degrees s-1 (F = 11.0, p < 0.001), with RMS values at 400 degrees s-1 being the highest. There was also a velocity effect for MDF (F = 8.03, p < 0.001), with significant differences observed between 100 degrees s-1 and 300 degrees s-1 (F = 4.2, p < 0.05), 100 degrees s-1 and 400 degrees s-1 (F = 20.2, p < 0.0001), 200 degrees s-1 and 400 degrees s-1 (F = 15.221, p < 0.001), and 300 degrees s-1 and 400 degrees s-1 (F = 5.9, p < 0.01). In all cases the highest MDF values were exhibited at the lower velocities. Lastly, there was an interaction effect when comparing movement patterns at 400 degrees s-1, with MDF values being significantly higher during the non-reciprocal movement pattern than during the reciprocal movement pattern (F = 10.9, p < 0.01). Results indicated that during isokinetic movements, RMS and MDF activity of the hamstrings are altered as velocity changes. More specifically, as velocity increases overall hamstrings' co-activation increases and there is a shift in the power spectrum toward the recruitment of slower-twitch muscle fibers. Results also indicate that movement pattern (reciprocal vs. non reciprocal) does not effect appreciably SEMG activity of hamstrings' co-contraction.

Authors+Show Affiliations

Motor Control and Biomechanics Laboratory, Department of Kinesiology, University of New Hampshire, USA. rvc@cisuaix.unk.eduNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

14717025

Citation

Croce, R V., and J P. Miller. "The Effect of Movement Velocity and Movement Pattern On the Reciprocal Co-activation of the Hamstrings." Electromyography and Clinical Neurophysiology, vol. 43, no. 8, 2003, pp. 451-8.
Croce RV, Miller JP. The effect of movement velocity and movement pattern on the reciprocal co-activation of the hamstrings. Electromyogr Clin Neurophysiol. 2003;43(8):451-8.
Croce, R. V., & Miller, J. P. (2003). The effect of movement velocity and movement pattern on the reciprocal co-activation of the hamstrings. Electromyography and Clinical Neurophysiology, 43(8), 451-8.
Croce RV, Miller JP. The Effect of Movement Velocity and Movement Pattern On the Reciprocal Co-activation of the Hamstrings. Electromyogr Clin Neurophysiol. 2003;43(8):451-8. PubMed PMID: 14717025.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effect of movement velocity and movement pattern on the reciprocal co-activation of the hamstrings. AU - Croce,R V, AU - Miller,J P, PY - 2004/1/14/pubmed PY - 2004/2/28/medline PY - 2004/1/14/entrez SP - 451 EP - 8 JF - Electromyography and clinical neurophysiology JO - Electromyogr Clin Neurophysiol VL - 43 IS - 8 N2 - The effect of velocity and movement pattern (reciprocal vs. non-reciprocal) on the reciprocal co-activation of the hamstrings was investigated through analysis of the root mean square (RMS) and the median frequency (MDF) of surface electromyography (SEMG). Fourteen subjects performed six continuous repetitions of a reciprocal isokinetic movement pattern (maximal extension followed by maximal flexion), and six continuous repetitions of a non-reciprocal movement pattern (maximal extension only) at 100 degrees, 200 degrees, 300 degrees s-1, and 400 degrees s-1. Data were analyzed using separate 2 x 4 (movement pattern x angular velocity) repeated measures analysis of variance (ANOVA). No significant differences (p > 0.05) were noted between reciprocal and non-reciprocal movement patterns for RMS. However, results did reveal a velocity effect for RMS (F = 5.0, p < 0.01), with significant differences observed between 100 degrees s-1 and 400 degrees s-1 (F = 9.4, p < 0.01), 200 degrees s-1 and 400 degrees s-1 (F = 9.5, p < 0.01), and 300 degrees s-1 and 400 degrees s-1 (F = 11.0, p < 0.001), with RMS values at 400 degrees s-1 being the highest. There was also a velocity effect for MDF (F = 8.03, p < 0.001), with significant differences observed between 100 degrees s-1 and 300 degrees s-1 (F = 4.2, p < 0.05), 100 degrees s-1 and 400 degrees s-1 (F = 20.2, p < 0.0001), 200 degrees s-1 and 400 degrees s-1 (F = 15.221, p < 0.001), and 300 degrees s-1 and 400 degrees s-1 (F = 5.9, p < 0.01). In all cases the highest MDF values were exhibited at the lower velocities. Lastly, there was an interaction effect when comparing movement patterns at 400 degrees s-1, with MDF values being significantly higher during the non-reciprocal movement pattern than during the reciprocal movement pattern (F = 10.9, p < 0.01). Results indicated that during isokinetic movements, RMS and MDF activity of the hamstrings are altered as velocity changes. More specifically, as velocity increases overall hamstrings' co-activation increases and there is a shift in the power spectrum toward the recruitment of slower-twitch muscle fibers. Results also indicate that movement pattern (reciprocal vs. non reciprocal) does not effect appreciably SEMG activity of hamstrings' co-contraction. SN - 0301-150X UR - https://www.unboundmedicine.com/medline/citation/14717025/The_effect_of_movement_velocity_and_movement_pattern_on_the_reciprocal_co_activation_of_the_hamstrings_ DB - PRIME DP - Unbound Medicine ER -