Muscle Strength Training Alters Muscle Activation of the Lower Extremity during Side-Step Cutting in Females

Jiyoung Jeong, Dai Hyuk Choi, Yongnam Song, Choongsoo S. Shin

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    The objective of this study was to examine the effects of muscle strength training on knee kinematics/kinetics and muscle activation patterns during anticipated side-step cutting. Three-dimensional knee kinematics/kinetics data and muscle activation of selected lower extremity muscles were measured while performing cutting before and after completing 10-week circuit strength training mixed typical resistance training and power training (intervention) or no training (control) from 25 female subjects. The muscle strength of quadriceps and hamstrings were measured before and after training using isokinetic dynamometer. No statistically significant differences were observed in quadriceps and hamstrings muscle strength, all kinematic/kinetic variables, and muscle activation for the control group. Both quadriceps (p = 0.005) and hamstrings (p = 0.030) muscle strength were increased after training. An increased biceps femoris (p = 0.003) and H:Q ratio of activation (p = 0.016), as well as decreased gastrocnemius muscle activation (p = 0.012) during pre-activation phase in intervention group were found. No significant differences were found in knee kinematics and kinetics both at the time frame of the initial contact and the peak tibial anterior shear force after training. In conclusion, muscle strength training altered some muscle activations of lower extremity muscles, which might affect the risk of ACL injury, but it did not change the kinematic/kinetic parameters.

    Original languageEnglish
    Pages (from-to)703-712
    Number of pages10
    JournalJournal of Motor Behavior
    Volume52
    Issue number6
    DOIs
    Publication statusPublished - 2020 Nov 1

    Bibliographical note

    Funding Information:
    This work was supported by the Ministry of Education of the Republic of Korea and the National Research Foundation of Korea (NRF-2015S1A5A2A01009376).

    Publisher Copyright:
    ©, Copyright © Taylor & Francis Group, LLC.

    Keywords

    • anterior cruciate ligament
    • electromyography
    • kinematics
    • kinetics

    ASJC Scopus subject areas

    • Biophysics
    • Orthopedics and Sports Medicine
    • Experimental and Cognitive Psychology
    • Cognitive Neuroscience

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