Shigeki Matsuda

Centre of pressure sway characteristics during static one-legged stance of athletes from different sports

Abstract The frequency of one-legged stance and two-legged stance differs considerably among sports. We therefore expect the balance ability of athletes from different sports to vary. This study compared the sway characteristics during a static one-legged stance of soccer players, basketball players, swimmers, and non-athletes. The centre of pressure sway during one-legged stance of ten male participants representing each of the four groups was measured using a stabilometer. Centre of pressure sway was assessed by four sway factors: sway velocity, anterior-posterior sway, horizontal sway, and high-frequency sway. None of the four groups of participants showed significant differences in body sway between standing on the dominant leg and standing on the non-dominant leg. The soccer players had more high-frequency sway and less anterior-posterior sway and horizontal sway than the basketball players, swimmers, and non-athletes. These results suggest that soccer players have superior ability to maintain a stable one-legged stance. Further study is required to determine how much of the superior balance ability in soccer players is innate and how much is developed through training, as well as to determine the relationship between balance ability and playing performance.

Static One-Legged Balance in Soccer Players during Use of a Lifted Leg

The goal was to describe static one-legged balance during use of a lifted leg and to compare balance between the dominant and nondominant legs of soccer players. Participants were 17 male soccer players and 17 untrained male students (control). Balance ability was evaluated with four sway measures: sway velocity, anterior–posterior sway, medial–lateral sway, and high-frequency sway. Soccer players had smaller magnitude mean anterior–posterior and medial–lateral sway than untrained students. Although mean sway velocity and anterior–posterior sway were higher with the dominant leg than in the nondominant leg of the control group, there was no significant difference on any sway factor between the two legs of the soccer group. In conclusion, the soccer players were observed to have superior static one-legged balance during use of a lifted leg, and there is no difference in balance for the two legs in the soccer group.

Examining Differences between Center of Pressure Sway in One-Legged and Two-Legged Stances for Soccer Players and Typical Adults

To examine stance during the measurement of balance ability, this study aimed to clarify the differences and relationships between balance ability in one-legged (dominant or nondominant leg) and two-legged stances in 25 typical male adults and 25 male soccer players. Balance ability was evaluated with four sway factors: sway velocity, anterior-posterior sway, lateral sway, and high-frequency sway factors. The one-legged stance was more unstable than the two-legged stance, the balance abilities related to two-legged and one-legged stances differed, and the balance abilities related to dominant-legged and nondominant-legged stances were similar. The one-legged stance, which was difficult to maintain stably, may be useful in the measurement of static balance ability in young people.

Age-related, interindividual, and right/left differences in anterior-posterior foot pressure ratio in preschool children.

BackgroundThis study aimed to examine age-related, interindividual, and right/left differences in anterior-posterior foot pressure ratio in 764 preschool children (364 boys and 400 girls) aged 3.5-6.5 years.MethodsSubjects maintained an upright standing posture for 10 seconds on the Footview Clinic, an instrument designed to calculate the anterior-posterior foot pressure ratio. The ratio of anterior foot pressure in each subject’s right and left feet was selected as a variable, and the mean of a 10 s measurement was used for analysis.ResultsThe ratio of anterior foot pressure was significantly larger in the right foot than in the left foot. With regard to age, the ratio of anterior foot pressure was significantly larger in children aged over 4.5 years than in children aged 3.5 years. It was also larger in children aged 6 and 6.5 years than in children aged 4 years. Interindividual differences in variables were large, and coefficients of variance were highest in children aged 3.5 years and lowest in children aged 6.5 years.ConclusionsIn conclusion, anterior foot pressure increases with age in preschool children. Interindividual differences in anterior foot pressure are large and tend to decrease with age. Furthermore, the anterior foot pressure is slightly higher in the right foot than in the left foot. These results will be useful for various studies, such as examining relationships between the anterior-posterior foot pressure ratio and factors, such as untouched toes, physical fitness, and level of exercise.

Cross-Sectional Study Shows Kindergarten Barefoot Policy Positively Affects Soles’ Contact Area

Although some studies have examined the effect of allowing preschool children to go without shoes, some points remain unexamined. Therefore, this study examined the effect of kindergartens’ barefoot policy on the contact area of the soles of the feet (plantar arch, hallux valgus angle, and foot angle). Participants were 313 preschool children (169 boys; 144 girls) at a kindergarten following the barefoot policy and 339 (176 boys; 163 girls) at a kindergarten not following the policy. The children stood barefoot on a pedoscope, so images of their soles’ contact area could be taken and then analyzed by software specifically for that purpose. Both boys and girls who attended kindergartens with barefoot policy had better development of the plantar arch and less angle of the hallux valgus than children who attended kindergartens not following the barefoot policy. Only boys who attended kindergartens that followed barefoot policy had a larger foot angle than children who attended kindergartens that did not. For preschool children, barefoot policy positively affected their soles’ contact area.