이 연구는 장거리달리기 선수의 경기력 향상을 위하여 운동화 굴곡강도의 증가가 주행효율과 하지의 에너지 반환에 어떠한 영향을 미치는 것인가를 규명하고 주행효율과 에너지 반환 사이의 관계를 규명하는데 그 목적이 있다. 이 연구의 피험자는 최근 1년 이내에 하지에 부상경험이 없는 자로서 건강한 남자 대학생 10명이었다. 굴곡강도가 각기 다른 4종류의 실험용 운동화를 대상으로 3차원 영상분석법과 호흡가스분석 측정장치를 이용하여 운동화 굴곡강도에 따른 에너지 반환과 에너지소비량을 구하여 분석한 결과 다음과 같은 결론을 얻었다. 첫째, 운동화 굴곡강도가 증가하면 할수록 통계적인 차이는 나타내지 않았으나 하지관절의 최대굴곡모멘트와 최대굴곡파워는 감소하는 경향을 나타냈고 최대신전모멘트와 최대신전파워는 증가하는 경향을 나타냈다. 둘째, 하지관절 에너지는 제1국면에서 통계적인 차이는 나타나지 않았지만 굴곡강도가 클수록 에너지 흡수가 적은 것으로 나타났고 제2국면에서는 에너지 생성이 더 많이 되는 것으로 나타났다. 굴곡강도가 클수록 에너지 효율성이 증대되는 것으로 나타났다. 셋째, 엉덩이관절의 굴곡모멘트와 에너지소비량과는 부적인 상관관계를 나타냈고(p<0.05), 발목관절 에너지와 에너지소비량은 제1국면에서 부적인 상관관계를 나타냈다(p<0.05). 이 연구를 통하여 운동화의 굴곡강도가 클수록 에너지소비량이 감소한다는 선행연구결과를 재확인했으며 굴곡강도가 클수록 에너지 효율성이 증대하였다. 에너지 반환변인과 에너지소비량과의 상관관계는 엉덩이관절과 발목관절의 최대굴곡파워, 발목관절의 에너지와 에너지소비량 사이에서 부적으로 나타났다. 또한 이 연구결과 발목관절에서 주로 에너지 손실의 감소가 이루어졌는데 이러한 원인이 발목관절의 운동범위를 제한한 것에 기인된 것인지는 추후연구를 통하여 이를 밝혀야 할 것이다
The purpose of this study was to investigate the effect of running economy and energy return in lower extremities according to the increase of bending stiffness of the shoes, furthermore to investigate the relationship between running economy and energy return for the improvement of sports performance. Subjects employed for this study were 10 healthy male college students who have not had the experiences in lower extremities injuries. Four different kinds of shoes in bending stiffness as with 0.56 N/mm, 0.74 N/mm, 0.96 N/mm, 1.21N/mm were used respectively. 3-D cinematography and pulmonary gas analyzer were utilized for energy return and energy consumption data during running according to the increase of bending stiffness of the shoes to obtain the following results. As the bending stiffness of running shoes increased, the statistical significance were not founded, however, the tendency of decrease in max. flexion moment and power, increase in max. extension moment and power in lower extremity joint were showed. Joints energy showed no statistical significance in phase 1, however, the tendency of lesser absorbtion as the bending stiffness of running shoes increased were showed. More energy were generated as the bending stiffness of running shoes increased in phase 2 with no statistical significance. Energy economy increased according to the increase of bending stiffness of running shoes. Negative correlation were showed between flexion moment of hip joint and energy consumption(p<0.05). Slightly higher degree of correlation between max. flexion power of hip and ankle joint and energy consumption were showed without statistical significance. Negative correlation were showed between joints energy and energy consumption for ankle joint in phase 1(p<0.05).
The purpose of this study was to investigate the effect of running economy and energy return in lower extremities according to the increase of bending stiffness of the shoes, furthermore to investigate the relationship between running economy and energy return for the improvement of sports performance. Subjects employed for this study were 10 healthy male college students who have not had the experiences in lower extremities injuries. Four different kinds of shoes in bending stiffness as with 0.56 N/mm, 0.74 N/mm, 0.96 N/mm, 1.21N/mm were used respectively. 3-D cinematography and pulmonary gas analyzer were utilized for energy return and energy consumption data during running according to the increase of bending stiffness of the shoes to obtain the following results. As the bending stiffness of running shoes increased, the statistical significance were not founded, however, the tendency of decrease in max. flexion moment and power, increase in max. extension moment and power in lower extremity joint were showed. Joints energy showed no statistical significance in phase 1, however, the tendency of lesser absorbtion as the bending stiffness of running shoes increased were showed. More energy were generated as the bending stiffness of running shoes increased in phase 2 with no statistical significance. Energy economy increased according to the increase of bending stiffness of running shoes. Negative correlation were showed between flexion moment of hip joint and energy consumption(p<0.05). Slightly higher degree of correlation between max. flexion power of hip and ankle joint and energy consumption were showed without statistical significance. Negative correlation were showed between joints energy and energy consumption for ankle joint in phase 1(p<0.05).
