Analysis on P.E Students′ Sprint Performance and Characteristics of Changes in Stride Length and Stride Frequency
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WT5”,6BZ]Stride length and stride frequency are the main factors determine running velocity, what changes do happen in P.E institute students′ stride length and stride frequency after sprint teaching? What can the changes offer to help improve sprint perform ance and sprint teaching and training? this paper make a initial research to the changes,the result of research shows: after sprint teaching, most students′ stride length and frequency are improved, a new combination of stride length and stride frequency, as for the two factors--stride length and stride frequency, male students make more improvement in stride length than stride frequency, while, female students make more improvement in stride frequency than in stride length.Keywords:
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Sprint
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This paper analyzes sports science parameter about stride length,stride frequency and average speed in fragment of world elite sprinters in 100?m by data statistice and concluded the way of keeping high speed of long time was by own's stride length,not stride frequency;the accelerative rhythm of whole run affected the whole run's achievement,stride length's contribution to speed is notably different than those of stride frequency.
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Elite
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Human physiology
Sports medicine
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Studying on sprint not only is important to this event itself, but also will accelerate the development of other events. Speed is an important index in sprint event and it is relate to stride length and stride rate. In this paper, we studied and analyzed the relationship of stride length. stride rate and speed of seven sprinters when the subjects run with five kinds of speed. In the trial, we filmed the technique of seven athletes with M9500 normal speed camera and got the data with which we analyzed the technique using SHIXUN image analysis system. The results show: (1) it is correct that seven athletes grasp gradual increase of speed, which prove that the choose of the athletes is believable; (2) when the speed increases, the stride length and the stride rate change with diHerent extent. But on the whole, it's tendentious. (3) When speed increased, stride length was the primary factor at low speeds while stride rate was the primary factor at high speeds. We suggest that seven athletes in this study should pay attention to strengthening the exercise of increasing the stride rate in usual training.
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Sprint
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It was found that the length of sprint and stride grown accompany with the age, but the rate of stride show a curve as “top descending growing”. The stride is most important for young sprint runner.
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Sprint
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The purpose of this study was to investigate the influence of sprint running pace on stride characteristics and their associated variability. Stride characteristics were determined for four experienced male track athletes during sprint running trials at three specified paces.
The influence of pace on the stride length and frequency were investigated along with the within subject coefficient of variation for the step frequency / length ratio and the stride velocity. Stride length and stride frequency were shown to influence velocity the greatest at the slowest and fastest paces respectively. Variability of the stride frequency / length ratio was shown to increase with pace whereas the variability of the stride velocity was shown to decrease with pace. Variability within the stride characteristics suggests athletes adopt a flexible control strategy which can adapt to potential perturbations.
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Sprint
Pace
Coefficient of variation
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The purpose of this study was to investigate the effects of change in stride frequency and/or stride length on oxygen uptake during distanc6 running, and to compare female runners with male runners in this point. Ten runners, nine table tennis players and eight swimmers underwent treadmill running at three different speeds. Running speed was constant and stride frequency was systematically changed over a range of ±20 strides/min of the free stride frequency (Experiment 1). Five male runners and four female runners ran on a treadmill at stride lengths between 60 cm and 130 cm with a given stride. frequency (160, 180 or 200 strides/min) and at stride frequencies between 150 and 200 strides/min with a given stride length (80 or 100cm) (Experiment 2). The measurements of oxygen uptake and HR were made during steady state in each running. 1) The most economical stride frequency (optimal stride frequency) in males always coincided with the free stride frequency. Both increase and decrease in stride frequency from the free stride frequency caused increase in oxygen uptake in male runners. Regarding female runners, oxygen uptake during distance running was a1most constant over a wide range of stride frequency (170-220). Specific optimal stride frequency was not observed in female runners. 2) Running with a given stride frequency caused a rectilinear relationship between oxygen uptake and stride length in male and female runners. It was suggested that change in stride length scarcely affected running efficiency during distance running. 3) There was an obvious difference between male and female runners in the effect of change in stride frequency on oxygen uptake during distance running with a given stride length. Decrease in stride frequency below 170 strides/min lowered the running efficiency in runners of both sexes. Above 180 strides/min, there was an exponential relationship between oxygen uptake and stride frequency in male runners, and a rectilinear relationship in female runners. Stride frequency higher than 180/min lowered running efficiency in male, but not in female runners. 4) Optimal stride frequency was observed in male runners, table tennis players and swimmers. Optimal stride frequency always coincided with free stride frequency in male subjects, and it was suggested that men without special training can run with the most economical stride frequency. 5) Stride length and stride frequency increased linearly as the running speed increased. Increase in running speed was dependent much more on increase in stride length than that of stride frequency. Contribution of stride frequency to an increase in running speed was more significant in female than male.
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Treadmill
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