Tracking of Time-Dependent Changes in Muscle Hardness After a Full Marathon

  • Takayuki Inami
    Institute of Physical Education, Keio University, Yokohama, Japan;
  • Kento Nakagawa
    Faculty of Sport Sciences, Waseda University, Tokorozawa, Japan;
  • Takahisa Yonezu
    School of Medicine, Tokai University, Isehara, Japan; and
  • Mako Fukano
    Faculty of Sport Sciences, Waseda University, Tokorozawa, Japan;
  • Ayako Higashihara
    Faculty of Sport Sciences, Waseda University, Tokorozawa, Japan;
  • Satoshi Iizuka
    Faculty of Sport Sciences, Waseda University, Tokorozawa, Japan;
  • Taira Abe
    Faculty of Sport Sciences, Waseda University, Tokorozawa, Japan;
  • Takaya Narita
    Department of Physical Therapy, Health Science University, Minamitsuru, Japan

抄録

<jats:title>Abstract</jats:title> <jats:p>Inami, T, Nakagawa, K, Yonezu, T, Fukano, M, Higashihara, A, Iizuka, S, Abe, T, and Narita, T. Tracking of time-dependent changes in muscle hardness after a full marathon. <jats:italic toggle="yes">J Strength Cond Res</jats:italic> 33(12): 3431–3437, 2019—We sought to identify changes in individual muscle hardness after a full marathon and to track time-dependent changes using ultrasound strain elastography (SE). Twenty-one collegiate marathon runners were recruited. Muscle hardness (i.e., strain ratio, SR) was measured using SE for the rectus femoris (RF), vastus lateralis (VL), biceps femoris (BF) long head, tibialis anterior (TA), gastrocnemius medial (GM) head, and soleus (SOL) muscles at the following time points: pre (PRE), immediately post (POST), day-1 (D1), day-3 (D3), and day-8 (D8), after a full marathon. We found that the SR decreased after the full marathon (i.e., the muscle became harder), and that the lowest SR across all measured muscles was observed on D1. Although there was no difference in the magnitude of change in SR between the muscles of the thigh, that of the MG and SOL were significantly larger than that of the TA. Muscle hardness in the vastus lateralis, biceps femoris, and SOL recovered at D8 (i.e., nonsignificant difference from PRE), whereas recovery of rectus femoris and gastrocnemius medial hardness at D8 was not observed. Thus, the degree of change in muscle hardness does not occur uniformly within the lower extremity muscles. In particular, changes in muscle hardness of the TA after a full marathon are small compared with other muscles and time-dependent changes in each muscle vary during recovery. The features of muscle hardness identified in this study will be useful for coaches when mentoring runners on proper forms and for training advisers and therapists who seek to address deficiencies in running.</jats:p>

収録刊行物

被引用文献 (3)*注記

もっと見る

参考文献 (20)*注記

もっと見る

関連プロジェクト

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ