Force generation and neuromuscular activity in multi-joint isometric exercises: comparison between unilateral and bilateral stance

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<p>The purpose of the present study was to look at lower extremity force generation and neuromuscular activation by comparing isometric mid-thigh pull in the unilateral stance (IMTP<sub>Uni</sub>) and bilateral stance (IMTP<sub>Bi</sub>), and identifying the characteristics of IMTP<sub>Uni</sub>. Fifteen male collegiate athletes (age: 20.60 ± 1.50 years, height: 1.74 ± 0.05 m, mass: 69.04 ± 4.23 kg) performed IMTP<sub>Uni</sub> and IMTP<sub>Bi</sub> as multi-joint isometric exercise. Ground reaction force (GRF) was measured to assess force generation during IMTP. Surface electromyography (EMG) was used to measure neuromuscular activation in the gluteus maximus (G<sub>max</sub>), gluteus medius (G<sub>med</sub>), semitendinosus, biceps femoris (BF), rectus femoris (RF) and vastus lateralis (VL), which were represented as average rectified values (ARVs). The EMG of the muscles during IMTP<sub>Uni</sub> was normalized by IMTP<sub>Bi</sub> to compare relative change among muscles. The co-contraction index (CI) during IMTP<sub>Uni</sub> was also calculated by using normalized EMG. As a result, IMTP<sub>Bi</sub> was significantly higher in BF than IMTP<sub>Uni</sub>. However, in IMTP<sub>Uni</sub>, although only one leg contributed to produce force, GRF of IMTP<sub>Uni</sub> reached 80% of neuromuscular activity relative to IMTP<sub>Bi</sub>. While the neuromuscular activation of G<sub>max</sub>, G<sub>med</sub>, BF, RF and VL was significantly higher proportionately in IMTP<sub>Uni</sub> compared to IMTP<sub>Bi</sub>, neuromuscular activation was even greater in G<sub>max</sub> and G<sub>med</sub>. The co-contraction index (CI) was increased in IMTP<sub>Uni</sub>. The features of neuromuscular activation during IMTP<sub>Uni</sub> were similar to the single leg squat and step-up exercise examined in previous studies due to the necessity to support the body with a single leg.</p>

収録刊行物

  • The Journal of Physical Fitness and Sports Medicine

    The Journal of Physical Fitness and Sports Medicine 7(5), 289-296, 2018

    一般社団法人日本体力医学会

各種コード

  • NII論文ID(NAID)
    130007486178
  • NII書誌ID(NCID)
    AA12573156
  • 本文言語コード
    ENG
  • ISSN
    2186-8131
  • NDL 記事登録ID
    029256183
  • NDL 請求記号
    Z76-A776
  • データ提供元
    NDL  J-STAGE 
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