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Article type: Research Article
Authors: Hirota, Kentoa; b | Watanabe, Kotaa; * | Miyamoto, Hirokic | Negishi, Keisuked | Watase, Makoa | Teramoto, Atsushie
Affiliations: [a] Department of Physical Therapy, Sapporo Medical University, School of Health Sciences, Sapporo, Japan | [b] Tokachi Physical Lab, Obihiro, Japan | [c] Department of Physical Therapy, Faculty of Health and Medical Science, Teikyo Heisei University, Tokyo, Japan | [d] Department of Rehabilitation, Hitsujigaoka Hospital, Sapporo, Japan | [e] Department of Orthopaedic Surgery, Sapporo Medical University, School of Medicine, Sapporo, Japan
Correspondence: [*] Corresponding author: Kota Watanabe, Department of Physical Therapy, Sapporo Medical University School of Health Sciences, South-1, West-17, Chuo-ku, Sapporo 0608556, Hokkaido, Japan. Tel.: +81 11 611 2111; Fax: +81 11 611 2150; E-mail: [email protected]. ORCID:0000-0001-9435-7817.
Abstract: BACKGROUND: The intrinsic foot muscles play an important role in medial longitudinal arch support, as well as several extrinsic foot muscles. While various strength training methods specific to intrinsic foot muscles have been conducted, these exercises are associated with certain concerns regarding their effectiveness and difficulty. We developed a new exercise for the intrinsic muscles (MTP flexion exercise). OBJECTIVE: The aim was to compare the shear modulus of the toe flexors as the muscle contraction activity during MTP flexion and short-foot exercises using ultrasound shear wave elastography. METHODS: Eleven healthy participants were included in this study. The shear modulus of the toe flexor muscles was measured during MTP flexion and short-foot exercises using ultrasound shear wave elastography. The muscle shear modulus was statistically compared between the resting phase, and during the two exercises. RESULTS: The shear modulus during MTP flexion exercise was significantly greater than in the resting phase in the abductor hallucis, flexor hallucis brevis, flexor digitorum brevis, quadratus plantae, and flexor digitorum longus. The flexor digitorum longus showed greater shear modulus during MTP flexion exercise than during short-foot exercise. CONCLUSION: MTP flexion exercise showed equivalent or greater contraction activity in certain intrinsic and extrinsic foot muscles when compared with short-foot exercise. This exercise is considered one of the training options for strengthening the intrinsic muscles of the foot.
Keywords: Toe flexor strength, intrinsic foot muscle, foot exercise, shear modulus
DOI: 10.3233/BMR-230282
Journal: Journal of Back and Musculoskeletal Rehabilitation, vol. Pre-press, no. Pre-press, pp. 1-7, 2024
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