Longitudinal changes in stride length and stride rate of children running
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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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The purpose of this study was to analyze two consecutive strides and compare results of gait and posture between the first stride, second stride and mean of the two strides. Two strides were filmed and digitized for 36 children at both 100m and 900m on three separate occasions. Head and trunk f1exion, stride length, stride rate and double support time were recorded. No significant differences were found between the first, second and mean of the two strides for trunk! head flexion and stride length. Differences were recorded between the first and second stride in stride rate and double support time, although neither stride was significantly different from the mean of the two strides. It was concluded that only one stride need to be digitized for an accurate representation of posture and gait.
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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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From the literature it is evident that there is no clarity whether or not middle distance runners should use shorter or longer stride lengths and higher stride frequencies. To address this problem, 30 North-West Province road runners were selected on a stratified basis according to their performances. The stature, total leg length, thigh length, lower leg length, body mass, percentage body fat, stride length, stride frequency and maximum oxygen consumption (VO2-max) were measured as independent variables. The distance the athletes ran in 12 min. was measured as the dependent variable. Different multiple regressions were done to determine the contribution of the independent variables to explain the distance covered in 12 min.. Descriptive statistics and correlation coefficients were also done. Results indicated that stride frequency and stride length of a group of middle distance runners were inversely proportional to each other, which means that the runners used higher stride frequencies in combination with relatively smaller stride lengths. It was also found that the better runners have faster stride frequencies and that provincial middle distance runners use lower stride frequencies than international middle distance runners. Key Words: Biomechanics, stride length, stride frequency, maximum oxygen consumption, leg length, middle distance runners, road runners. AJPHERD Vol.10(3) 2004: 238-247
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The paper explains a term-stride length of middle-distance run from two aspects, one is the basic factors infect on speed,the other is kinematics parameter of support period.It shows that stride length has direct relationship with stride index and stride frequency.The main reasons to infect on stride length are the ratio of time of support and empty out,the angle of knee when the support leaves ground and so on. At last, the paper suggests stride length for runners with different ability.
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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.
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Distance runners naturally select a stride length that minimizes oxygen uptake. However, this preferred stride length (PSL) varies from person to person. Some studies have investigated variables such as leg length and body mass, but have found only small correlations between these variables and PSL. It is known that women's PSL tends to be lower than men's at any given speed, but whether this is because they are women or because they are shorter or less powerful has not been tested. PURPOSE This study investigated the correlation of leg length and maximal horizontal jumping distance with PSL and whether women's PSL is different from men's. METHODS Thirty subjects (fifteen men and fifteen women) ran one seven-minute mile on a treadmill. PSL was measured during the final two minutes of the run by measuring the time 100 strides took. This was confirmed with a video recording of the run. Following the run, leg length, q-angle, standing long jump power and distance were measured. The maximum power and distance of five standing long jumps were used in the analysis. A regression analysis was performed to test for significant correlations using PSL as the dependent variable and leg length and horizontal jumping distance as independent variables. RESULTS Leg length and maximum jump length showed a significant positive correlation with PSL (R2=0.36, p = 0.03 and 0.05 respectively). Females had shorter stride lengths than males even after accounting for differences in leg length and standing long jump distance (p = 0.05). CONCLUSION This study adds to the knowledge of what determines PSL by including standing long jump distance in significant determinants of PSL. However, factors other than leg length and standing long jump distance still need to be considered.
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