Influence of performance level on pacing strategy during 10 km race in recreational runners

AbstractThe aim of the present study was to verify the influence of the performance level in the strategy of running pacing from recreational runners. Additionally, it was aimed to describe the heart rate (HR) responses measured in a 10-km running performance in a track. Thirty-nine recreational runners took part (31.5 ± 6.7 years), who had experience in 10-km races and realized a 10-km running performance in a track (400 m). HR was constantly monitored (Polar RS800) and the time each 400 m was registered to determine MS, and then analyzed each 2 km. Participants were divided into two groups according to their MS attained in the tests: G1 - MS 10 km ≤ 11.81 (n = 20) and G2 - MS 10 km &gt; 11.81 (n = 19). The comparison between MS and GR obtained in different moments of the performance for both groups was made by mixed Anova for repeated measures, adopting a significance level of p &lt; 0.05. MS values were different between the groups in all moments analyzed with a significant increase in MS from moment 6-8 km to 8-10 km for the same group. HR values were different only within-groups. In G1, there was a significant increase in HR each 2 km. For G2, HR increased from the second to the forth km and remained stable up to the eighth km, increasing again in the last 2 km of the performance. We concluded that the performance level does not influence in the running strategy of recreational runners.摘要 本研究旨在验证休闲跑者的跑步配速策略对其运动表现水平的影响，并描述在400米标准田径场开展的10公里跑步测试中受试者的心率（heart rate, HR）响应特征。共有39名具备10公里赛事经验的休闲跑者参与本研究，年龄为31.5±6.7岁，所有受试者均完成田径场10公里跑步测试。研究采用Polar RS800设备持续监测受试者心率，并记录每400米的分段用时以计算代谢配速（metabolic speed, MS），随后以2公里为区间开展分段分析。根据测试中获得的10公里代谢配速（MS），将受试者分为两组：G1组（10公里MS≤11.81，n=20）与G2组（10公里MS>11.81，n=19）。本研究采用显著性水平为p<0.05的重复测量混合方差分析，比较两组在不同测试时段的代谢配速（MS）与GR的差异。结果显示，两组在所有分析时段的代谢配速值均存在显著差异，且同一组内的代谢配速在6-8公里至8-10公里区间呈显著上升趋势。心率数据仅在组内存在显著差异：G1组的心率每2公里分段均显著升高；G2组的心率在2-4公里区间出现显著上升，随后维持稳定至8公里区间，并在最后2公里区间再次升高。本研究最终得出结论：休闲跑者的运动表现水平并不会对其跑步配速策略产生影响。