影响1 500m跑节奏的机械要因及赛后血乳酸浓度分析

The Effect of Mechanical Factors and Post-competition Blood Lactate on Pace of 1500m

目的:对影响1500m跑速的各机械变量及赛后血乳酸浓度进行相关分析。方法:以11名男子中长跑选手为研究对象,通过视频分析与血乳酸浓度测试,获取选手各机械变量及赛后血乳酸浓度值。结果:步幅与速度间呈显著相关性(r=0.805,P<0.01)。赛后血乳酸浓度峰值与比赛成绩无显著相关性。L3区间速度与血乳酸浓度峰值呈显著相关性(r=0.608,P<0.05)。各区间变量分配在L3区间速度、步频、身体垂直刚度最小,重心位移最大;L4区间步幅、最大地面反作用力、腾空时间最小,接地时间最大。结论:步幅对选手节奏影响显著。第三区间乳酸堆积及机械变量薄弱是导致选手比赛中、后程速度降低的主要原因。

The purpose of this study was to investigate the effect of mechanical factors and post-competition blood lactate on pace of 1500m.Methods:11 middle and long-distance runners were taken as the research objects.Through the video analysis and the blood lactate concentration test,the runner’s mechanical factors and post-competition blood lactate values after the race are obtained.The results were as follows:Stride length and running speed were significantly correlated(r=0.805,P<0.01),No correlation was found between blood lactate concentration and race time,but L3 section running speed and PBLa were significantly correlated(r=0.608,P<0.05).From the perspective of variables in each section,the speed,stride frequency,and vertical stiffness(Kvert)are the smallest,and the center of mass(Δy)is the largest in the L3 section.The stride length,maximal reaction force(Fmax)and flight time are the smallest,and the contact time is the largest in the L4 section.Conclusions:The stride length has a significant effect on the runner’s pace.accumulation of lactate and mechanical factors of L3 section are the main causes for the runner’s speed reduction。