The influence of physical exercise on the relation between the phase of cardiac cycle and shooting accuracy in biathlon     

Germano Gallicchio  Thomas Finkenzeller  Gerold Sattlecker  Stefan Lindinger 《European Journal of Sport Science》2019,19(5):567-575

This study examined the influence of physical exercise on the relation between shooting accuracy and the phase of the cardiac cycle in which the shot is fired. Thirteen experienced biathletes (8 females, mean age 17 years) fired from the standing position at rest and right after a submaximal exercise on a bicycle ergometer. Shooting accuracy and the timing of each shot relative to the R-waves of the electrocardiogram (ECG) were recorded. Best shots (with greatest accuracy) and worst shots (with lowest accuracy) were fired prevalently in different phases of the cardiac cycle. In the rest condition, best shots were fired less frequently from 200 to 300?ms and more frequently from 500 to 600?ms after the R-wave, compared to worst shots. In the exercise condition, best shots were fired less frequently from 100 to 200?ms after the R-wave and from 20% to 30% of the R-R interval, compared to worst shots. These findings support the hypothesis that shooting accuracy is influenced by the cardiac cycle phase due to the ballistocardiac recoil generated at each heartbeat. To achieve best results athletes could be trained (e.g. through biofeedback) to fire within a specific phase of the cardiac cycle.  相似文献   

运动对心肌细胞第二信使的影响   总被引：1，自引：0，他引：1  

陈岩  胡磊 《体育科技文献通报》2008,16(7):32-33

第二信使是指受细胞外信号的作用,在细胞质基质内形成或向细胞质基质释放的细胞内小分子,其负责将信号传到细胞内部,如cAMP、cGMP和Ca^2＋等。通过查阅大量文献资料,本文对第二信使的研究进展以及运动对心肌第二信使的影响进行综述。  相似文献   

心源性运动猝死的研究进展     

陈健 《辽宁体育科技》2008,30(2):29-31

应用文献资料法。探讨和分析了心源性运动猝死的病因和可能机制,阐述了最近几年预测心源性猝死危险性的新进展,并提出了一些预防措施。  相似文献   

心脏康复中运动终止原因的预测     

刘洵  Brodie D A  陈翀  Bundred P E 《体育科学》2008,28(9)

目的:通过分析心肌梗塞后患者(PMI患者)运动中功能、生理、知觉和临床的反应,检测他们运动终止的主要原因(RET),目的在于确定RET是否可被预测得出;方法:112名男性近期PMI患者在活动跑台上进行递增负荷运动实验,运动终止依美国运动医学会推荐的标准。随后,受试者依据不同的运动终止原因被细分为4个组(生理组,身体组,感觉组和临床组)。运动中记录主观用力感觉、血压、血乳酸浓度(BL)、摄氧量、心率和呼吸困难记分,并且连续监控12导联心电图。运动前测量血胆固醇浓度(BC)。结果显示,在运动能力方面,身体组和知觉组的运动终止原因优于临床组,但劣于生理组。患者的分布在BC为5.4mmol·L-1和BL为1.6mmol·L-1这两点出现了显著的组间差异(P<0.01或P<0.05)。在获得了安静状态下的BC和BL,病人的RET便可被预测出来,且预测具有较高的敏感性和特异性。结论:利用本研究得出的方法对RET进行预测,在心脏康复的运动实验和处方制定中,都可发挥出有益的作用。  相似文献