배낭 착용에 따른 트레킹화 미드솔(midsole)경도가 보행에 미치는 영향
Effect of Trekking Shoes Midsole Hardness on Walking According to Backpack Wear
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〔목적〕 본 연구는 배낭을 착용함에 따라 트레킹화 미드솔 경도가 인체 보행 역학에 미치는 영향을 규명하는데 목적이 있다. 〔방법〕 총 10명의 성인남성(연령:23.20±1.33세, 신장: 1.72±0.03cm, 체중: 67.60±5.95kg)을 대상으로 각기 다른 미드솔 경도(Soft, Medium, Hard)와 배낭(체중의 30%)의 착용여부를 무작위로 선정하여 8m의 구간을 1.5m/s 속력으로 걷도록 실시하였다. 보행 속도 통제를 위해 구간 속력 측정기를 활용하였고, 신체 움직임에 대한 측정을 위해 10대의 적외선 카메라(Vicon motion capture system, UK)와 지면반력기(AMTI, ORG-6, US)를 사용하였다. 〔결과〕 첫째, 충격현상의 변화에서 배낭 착용 시 지면접촉시간(p<.05)이 더 길어졌다. 둘째, 인체 충격흡수 전략에서 발목관절에서 최대 발바닥 굽힘 속도가 Hard가 Soft보다 더 빠르게 나타났으며, 최대 발등 굽힘 모멘트가 배낭 착용 시 감소하였다(p<.05). 또한, 무릎의 최대 폄 모멘트는 배낭 착용 시 유의하게 증가하였다. 넷째, 기계적 음의 일에서는 발목관절은 Soft가 Medium보다 적은 양의 일을 수행하였고, 무릎관절은 배낭을 착용함에 따라 증가하였다(p<.05). 〔결론〕 본 연구의 결과 본 연구에서 사용한 미드솔 경도 차이로는 배낭을 착용하여도 보행의 역학적 움직임에 영향을 미치지 못하는 것으로 보이며, 추후 연구에서는 신발의 유무 또는 근 피로 유발을 통해 미드솔의 효과를 조사하는 것이 필요할 것으로 사료된다.
Abstract
[Purpose] The purpose of this study was to investigate the effect of midsole hardness on gait mechanisms by wearing a backpack. [Methods] Ten healthy adult males(age:23.20±1.33yrs, heights: 1.72±0.03cm, weights: 67.60±5.95kg) participated in this study. Subjects walked at a speed of 1.5m/s in an 8m section wearing randomly selected midsole hardness (Soft, Medium, Hard) shoes and backpack (30% of body weight). For measurement of body movement, 10 infrared cameras (Vicon motion capture system, UK) and force plate (AMTI, ORG-6, US) were used. [Results] First, in the shock phenomenon change, the ground contact time was longer when wearing a backpack. Second, in the shock absorption strategy, the pack plantarflexion velocity at the ankle joint was faster in Hard than Soft, and the pack dorsiflexion moment decreased when wearing a backpack (p<.05). Also, the pack extension moment of the knee increased significantly when wearing a backpack. Fourth, in the mechanical negative work, the ankle joint performed less work than the medium soft, and the knee joint increased as the backpack was worn (p<.05). [Conclusion] As a result of this study, the difference in the hardness of the midsole used in this study does not seem to affect the biomechanical movement of gait even when wearing a backpack. In future studies, it is necessary to investigate the effect of the midsole through the presence or absence of shoes or inducing muscle fatigue.
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