Abstract
Exhaustive running at maximal oxygen uptake velocity (vVO2max) can alter running kinematic parameters and increase energy cost along the time. The aims of the present study were to compare characteristics of ankle and knee kinematics during running at vVO2max and to verify the relationship between changes in kinematic variables and time limit (Tlim). Eleven male volunteers, recreational players of team sports, performed an incremental running test until volitional exhaustion to determine vVO2max and a constant velocity test at vVO2max. Subjects were filmed continuously from the left sagittal plane at 210 Hz for further kinematic analysis. The maximal plantar flexion during swing (p<0.01) was the only variable that increased significantly from beginning to end of the run. Increase in ankle angle at contact was the only variable related to Tlim (r=0.64; p=0.035) and explained 34% of the performance in the test. These findings suggest that the individuals under study maintained a stable running style at vVO2max and that increase in plantar flexion explained the performance in this test when it was applied in non-runners.
Highlights
Kinematic analysis of exhaustive running becomes important due to possible changes in stride pattern[1]
The comparison of mean values for the kinematic variables between initial (I) and final (F) running stages at time limit (Tlim) is shown in table 2
Based on the comparisons presented in table 2, it was possible to observe that maximal plantar flexion during swing was the only variable that increased significantly (p
Summary
Kinematic analysis of exhaustive running (prolonged submaximal running and short and medium-duration running at high intensity) becomes important due to possible changes in stride pattern[1]. This fact is related to the continuous increase in blood lactate [La] and to metabolite accumulation in muscle fibers at intensities corresponding to heavy and severe domains[2], which would cause kinematic changes in the stride cycle[3]. Other authors reported that ankle muscle fatigue caused decreased dorsiflexion at foot contact with the ground[7] and that changes in ankle angle explained 67% of the variance in oxygen uptake (VO2) during running performed after long-duration cycling exercise[8]. The knee joint would have a key role both in shock absorption[3] and running energy cost[9]
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