engleski

A comparison of ground reaction forces between barefoot and shod race walking

It is well known that in normal walkig soft shoe sole reduces First passive peak of vertical GRF and delays its occurrence compared to barefoot walking. However, little known about the influence of shoes on anterio- posterior GRF which is important for performance, e.g. race walking. The purpose of this study was to compare barefoot and shod race walking to estimate the effect of race walking shoes on GRF. One female race walker (height 173 cm ; weight 48.9 kg ; age 25 years)participated in the study. She performed ten trials in shood conditions and barefoot conditions respectively over the force plate. The force plate was covered with the track and sampling rate was 1000 HZ. The descriptive statistics was performed. The first posterior propulsion (acceleration) occurred in both conditions and at all velocities but it was always higher in shod (10.5 % ± 3.1 of the whole propulsion) than in barefoot conditions (1.7 % ± 1.8 of the whole propulsion. At the end of the contact, small propusion in anterior direction (braking) occured in shod conditions only and presents 6.1 % ± 3.1 of the whole propulsion in anterior direction. The results of the present study showed that initial propulsion in race walking is enhanced by shoe. Initial posterior propulsion, which was observed during both barefoot and shod walking, is initiated by strong hip extension prior to and during ground contact. However, the heel rocker effect which may contribute to initial posterior propulsion may be enhanced with shoe by increasing lever between floor contact and the center of the ankle joint compared to the barefoot condition.

race walking ; barefoot walking ; biomechanics ; ground reaction forces

nije evidentirano