The effect of instep kick in intermittent sprint on heart rate and external workload
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Purpose: The aim of this study was to investigate the relationship between heart rate and external workload in intermittent sprint with and without instep kick. Participants: 20 male junior players participated in the field experiment consisting of different exercise with blocks of sprint. Method: The exercise was conducted on two different days and the order of the sprint with and without instep kick was changed each day. One sprint is 32 meters in total and last 5 to 6 seconds, with a 180 degrees turning point halfway. A new sprint was performed every 30 seconds. Recovery time between the 2 blocks of sprints was about 3 minutes. The exercise was used as a part of normal training regime which means that it was not added to the team’s weekly training dosage. Heart rate (HR) was recorded by the Polar Team 2 system and ZXY tracking device was used to record position and acceleration of the players from which work and power were calculated. Result: No significant effect was found for instep kick or players playing position in intermittent sprint. Significant differences were observed for average heart rate (HRavg) and peak heart rate (HRpeak), but not for duration of heart rate peak in seconds (TPHR) between the two days. Considering interaction between day and different blocks of sprint, significant differences was found for HRavg, HRpeak (p < 0.01), but not for duration of TPHR. For absolute work (AW), peak power acceleration (Ppeak-acc) and peak power deceleration (Ppeak-dec) statistical significant differences were not observed between days and blocks of sprint. No significant effect was found for interaction between condition and day for these variables. Conclusion: This study demonstrated that neither an instep kick nor playing position has an effect on sprint performance, meaning that adding instep kick into intermittent exercise does not affect performance regarding heart rate and external workload.