Effects on muscles of the lower limb by damages on the foot and possibility of recovery -Morpho-functional analyses-

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K10833
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 58070:Lifelong developmental nursing-related
• Research Institution: Saga University
• Principal Investigator: Kawano Hitoshi 佐賀大学, 医学部, 客員研究員 (10152985)
• Co-Investigator(Kenkyū-buntansha): 鈴木 智恵子 佐賀大学, 医学部, 教授 (20569636) ; 新名 美佳 兵庫医科大学, 看護学部, 助教 (10828297) ; 楢原 美鈴 産業医科大学, 産業保健学部, 助教 (30727615)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: タイトな靴 / ラット / 後肢筋 / 発育

Outline of Final Research Achievements

Wear of unsuitable sized shoes during childhood and adulthood affects development of the lower limb muscles. An artificial shoe made of resin was equipped for 1 week to the right foot of rats aged 3 weeks, the next day of weaning (Y1+0), or 8 weeks corresponding to adolescence (A1+0). The mean of the short diameter (MSD) of muscle cells of the medial and lateral gastrocnemius, soles and anterior tibial muscles (MG, LG, So and AT, respectively) was measured. The same measurement was obtained from rats with 1 week after the removal of the resin (Y1+1 and A1+1).
At Y1+0, the MSD of the LG and So of the operated leg (OpL) was significantly smaller than the non-operated leg (NoL). The MSD of the MG was larger but that of the AT was not changed. At Y1+1, the MSD of the MG and LG of the OpL was returned to the level of the NoL. A1+0, the MSD of the MG of the OpL was smaller than the the NoL, but it returned to the level of the NoL at A1+1.
Importance of foot education for posture is suggested.

Free Research Field

組織学一般

Academic Significance and Societal Importance of the Research Achievements

幼少期のタイトな靴の着用は歩行の際の地面を蹴る動作に必要な踵の挙上に関与する筋に悪影響を及ぼすことが示唆された．しかし，足への負荷が除かれれば，すべての筋ではないものの，成長が回復する筋があることが明らかとなった．以上のことから，筋の正常な成長には幼少期に適切な靴を着用することが重要であり，そのための「足育」を啓蒙する必要性が示された．