Enhancing the weight training experience: A comparison of limb kinematics and EMG activity on three machines

Yasushi Koyama, Hirofumi Kobayashi, Shuji Suzuki, Roger M. Enoka

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    The aim of the study was to compare the kinematics and the timing and amount of electromyographic (EMG) activity during the lat-pull down exercise performed on machines that afforded one, two, or three degrees of freedom for the movement. Seven healthy men (age 29.4 ± 5.6 years) participated in the study. The exercise was performed with a 30% 1-RM load. Three types of machines with varying degrees of freedom were used: Type 1, the conventional device that restricted the movement to a frontal plane; Type 2, the addition of forearm supination-pronation; Type 3, the addition of forearm supination-pronation and horizontal extension-flexion about the shoulder. All exercises involved a technique known as beginning movement load (BML) training in which light loads are lifted with a relaxation-lengthening-shortening sequence of muscle activation. The Type-3 machine showed: (1) the greatest vertical displacement of the wrist (p < 0.05); (2) the greatest abduction-adduction displacement about the shoulder (p < 0.01); (3) the least flexion-extension displacement about the elbow joint (p < 0.01); (4) a peak vertical velocity for the shoulder that preceded (p < 0.01) those for the elbow and then wrist during the pull-down phase; (5) a progressive proximal-to-distal sequence of EMG activation involving the serratus anterior, posterior deltoid, latissimus dorsi, and triceps brachii muscles; (6) a reversal of the roles for biceps and triceps brachii during the pull-down phase. These results suggest that BML exercises with greater degrees of freedom can enhance the association between training actions and functional activities.

    Original languageEnglish
    Pages (from-to)789-801
    Number of pages13
    JournalEuropean Journal of Applied Physiology
    Volume109
    Issue number5
    DOIs
    Publication statusPublished - 2010 Jul

    Keywords

    • Beginning movement load training
    • Dodge movement
    • EMG activity
    • Kinematics

    ASJC Scopus subject areas

    • Public Health, Environmental and Occupational Health
    • Orthopedics and Sports Medicine
    • Physiology (medical)

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