| Objective: By monitoring the changes of heart rate, blood pressure and ECG of sportstraining students of Shenyang Normal University in100-meter dash in hot environment, Iclarifies the impact of100-meter dash on heart function in this essay.Method: In a hot environment, we firstly measured students’ resting heart rate, bloodpressure and electrocardiogram. After a100-meter dash, we respectively measured thestudents’ heart rate, blood pressure after the first minute, the second minute and the thirdminute run as well as the ECG after the third minute run. Based on the heart rate equation,we figured out the HRVI of boys and girls. Then we respectively compared the heart rateand blood pressure of the first minute, the second minute and the third minute withresting heart rate and blood pressure, and compared the ECG after the third minute withthe quiet ECG, observing regularities of variation.Results:(1) Changes of heart rate: heart rate of boys and girls after three minutes runwere obviously higher than the resting heart rate before running (P <0.01), and recoveryof girls’ heart rate took longer time than that of boys’.(2) Changes of blood pressure: theblood pressure in the first two minutes after running was obviously different from theresting blood pressure before running (P <0.01), and the changes of girls’ blood pressureafter running were more obviously than those of boys’.(3) The HRVIs of boys and girlsafter running were25.04±4.18and20.64±2.67.(4) Changes of electrocardiogram R-Rinterval: the ECG standard Ⅰ Ⅱ Ⅲ R-R interval of boys and girls after running wasobviously lesser than the resting one (P<0.01), and the R-R interval of boys declinedmore dramatically than that of girls.(5) Changes of electrocardiogram Q-T interval:the ECG standard Ⅰ Ⅱ Ⅲ Q-T interval of boys and girls after running was obviouslylesser than the resting one (P<0.01), and the Q-T interval of girls declined moredramatically than that of boys.Conclusion: Heart rate of boys and girls in three minutes after100-meter dash in hotenvironment were significantly higher than resting heart rate before running, and heartrate of girls rose quickly while fell slowly; in the first two minutes after running, bloodpressure of boys and girls were obviously higher than resting blood pressure before running, and girls’ blood pressure changed more obviously; The HRVIs of boys and girlsafter running were25.04±4.18and20.64±2.67; electrocardiogram R-R intervaldecreased obviously after running, and boys’ R-R interval declined more dramaticallythan girls’; electrocardiogram Q-T interval decreased obviously after running, and girls’Q-T interval declined more dramatically than boys’. Changes of heart rate, blood pressure,HRVI and ECG after a100-meter dash in hot environment illustrated the obvious impactof100-meter dash on students’ heart function, especially on girls’. Thus, when we letstudents have a100-meter dash or especially a speed training project in hot environment,we should pay attention to monitor the changes of their heart rate, blood pressure andelectrocardiogram, especially those of girls. |
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