ブックタイトル教育医学 J.Educ.Health Sci.　第63巻　第2号　通巻 第288号

概要

教育医学 J.Educ.Health Sci.　第63巻　第2号　通巻 第288号

Keiko ABE, Tatsuya MIMURA, Hiroshi AKITAKE and Kan-ichi MIMURAfeet were formed at age 0.5 - 2.0 in boys, and at age0.5 - 1.0 in girls. High-arched feet did not emergeuntil age 3 in either gender, and then developeduntil they formed up to 8.6% of the girls aged 12.3．Relationship between plantar arches andmotor abilityTable 3 displayed the results of sprint, broadjump, and ball throw abilities according to the 5plantar arch categories. Among preschool children,boys with flat feet showed significantly less motorability than their counterparts with normal-arch feetand with BR (feet only normal-arch feet in the right)in 25-meter sprint, where girls with normal-archfeet were significantly better than ones with flat feetand ones with BR. In broad jump, both boys andgirls with normal-arch feet exhibited significantlyhigher ability than their counterparts with flat feet.Likewise, in tennis ball throw, boys with normalarchfeet achieved significantly better records thanboys with flat feet. Among schoolchildren,achievements in 50-meter sprint and in broad jumpby boys with normal-arch feet were significantlygreater than by boys with flat feet, whereas in50-meter sprint and broad jump, girls with flat feetshowed significantly lower abilities than the other 4feet type groups. In ball throw, boys with normalarchfeet were significantly more competent thanboys with flat feet.Ⅳ．DiscussionThe purposes of this study were to determine thedevelopment of plantar arches among children aged 0to 12, and also to determine the relationship betweenplanter arches and motor ability after age 4 in bothgenders and at the two phases of preschool and schoolages.The normal-arch feet develop rapidly during thefirst decade of life 11) . Flat feet ratio decreases aschildren grow. Previous studies reported a sharpdecrease up to age 4, because longitudinal arches areTable 2 Percentiles of plantar arches in 5 types according to gender and ageAge(yrs)0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 8.0 9.0 10.0 11.0 12.0Normal-arch feet (%) 0.0 0.0 9.8 16.7 25.0 35.0 43.6 52.3 55.0 62.1 65.0 70.4 71.9 72.4 74.4 74.9 77.8 78.3 77.9Flat feet (%) 100.0 81.3 70.7 56.7 46.9 39.0 28.2 19.5 19.2 9.1 8.4 7.3 6.7 7.5 8.7 8.7 7.7 5.9 8.7Boys BR (%) 0.0 0.0 4.9 3.3 12.5 13.0 16.7 14.8 14.8 17.3 15.0 14.3 10.7 7.0 2.9 6.4 4.8 9.9 5.7BL (%) 0.0 18.7 14.6 23.3 15.6 13.0 10.2 12.1 10.0 9.9 8.4 7.0 10.7 11.0 8.7 6.8 5.8 1.0 2.9High-arch feet (%) 0.0 0.0 0.0 0.0 0.0 0.0 1.3 1.3 1.0 1.6 3.2 1.0 0.0 2.1 5.3 3.2 3.9 4.9 4.8Normal-arch feet (%) 0.0 3.4 18.7 28.6 32.3 35.7 51.6 55.0 60.0 67.8 68.4 71.1 72.5 72.6 75.7 76.2 78.7 81.0 81.8Flat feet (%) 100.0 72.4 56.3 35.7 35.5 25.0 17.2 15.1 12.5 9.2 5.6 5.5 6.7 6.3 7.8 8.4 7.1 5.5 3.6Girls BR (%) 0.0 10.4 12.5 14.3 16.1 21.4 18.8 20.2 14.6 12.4 14.1 11.5 9.5 10.6 6.8 3.7 5.7 3.5 3.0BL (%) 0.0 13.8 12.5 21.4 16.1 17.9 9.4 5.9 10.5 5.7 7.8 7.7 8.5 6.7 2.9 4.7 3.8 5.0 3.0High-arch feet (%) 0.0 0.0 0.0 0.0 0.0 0.0 3.1 3.8 2.4 4.9 4.1 4.2 2.8 3.8 6.8 7.0 4.7 5.0 8.6Table 3 Relationship between plantar arches in 5 categories and the motor abilityNormal-arch feet Flat feet BR BL High-arch feetmean SD mean SD mean SD mean SD mean SDFp value25m sprint (sec)6.70.87.21.06.80.76.90.86.70.89.0FF