~~Purpose: This study was a comparison of physiological responses and speed performance of repeated sprint ability (RSA) with the change of direction between running on parquet surface (PS) and sand surface (SS).
Methods: In a crossover design, 12 team sport athletes (21.5 ± 0.8 years) have randomly performed six sprints at 0 degrees (straight line), 90 degrees, and 180 degrees (shuttle run) on PS and SS. The distance of RSA with a change of direction adjusted by using the formula compensate for the lost time during the change of direction. Maximum speed, average speed, percentage of speed decrement (%Dec), blood lactate ([La]b), oxygen uptake (VO2), ventilation (VE), carbon dioxide production (VCO2), and RPE were measured each testing.
Results: There was no significant interaction effect of the surface by direction for every dependent variable (all, p > 0.05). There were significant effects of surface for maximum speed and average speed (all, p < 0.05); but not for [La]b, VO2, VCO2, VE, RPE, and %Dec (all, p > 0.05). Specifically, running on PS had significantly higher maximum speed and average speed than SS. The main effect of running all direction was significant for [La]b, VO2, VCo2, VE, maximum speed, and average speed (all, p < 0.05); but not for RPE (p > 0.05).
Conclusion: Surface has affected on running speed; running on PS have a higher speed than SS, but the surface does not affect physiological responses. Running at the straight line has higher physiological responses than running with change direction.