Eighteen junior elite figure skaters were filmed while performing axel and double axel jumps. These same skaters were assessed for strength of the shoulders, knees, and hips at multiple angular velocities using a Cybex II system. The height of the jumps was significantly correlated with the strength data. Knee extension at 240 deg/sec and shoulder abduction at 300 deg/sec were shown to be the m...

The purpose of this study was to investigate the Artificial Neural Networks (ANNs) in conjunction with EMG characteristics to predict vertical jump height. This paper investigates three key areas for the development of a real-time biomechanical biofeedback system. The first area of investigation is the EMG data processing and characteristics that best suit the training of ANNs for prediction. T...

The purpose of this study was to investigate the possible arm swing effect on the biomechanical parameters of vertical counter movement jump due to differences of the compliance of the take-off surface. Fifteen elite male beach-volleyball players (26.2 ± 5.9 years; 1.87 ± 0.05 m; 83.4 ± 6.0 kg; mean ± standard deviation, respectively) performed counter movement jumps on sand and on a rigid surf...

Some insects can jump remarkable distances. A flea can jump up about a foot — 100 times its height. At the rate, a person would be able to leap over tall buildings. Actually most people can't even jump up their own height and no animal about the size of a person can do much better. Why is this? When the 1968 Summer Olympics were held in Mexico City, some people were concerned that reduced air r...

background: iran, a low- to middle-income country, has experienced considerable socioeconomic changes in 20 th century, which their impacts on the adult heights has not been assessed deeply by now. this article aims to quantify the temporal varia­tions of height (with respect to shrinkage of height due to aging) and its deterministic factors in iranian population born be­tween 1940 and 1984. me...

The present study analyzed the effect of increased distance on basketball jump shot outcome and performance. Ten male expert basketball players were filmed and a number of kinematic variables analyzed during jump shot that were performed from three conditions to represent close, intermediate and far distances (2.8, 4.6, and 6.4m, respectively). Shot accuracy decreased from 59% (close) to 37% (f...

The purpose of the study was to investigate the effect of an overhead target on the jump height and lower limb biomechanics in all three planes of motion in a vertical drop jump (VDJ) task among elite female handball and football (soccer) players. The hypothesis was that adding an overhead target to the VDJ task improves jump height, increases joint loading, and decreases frontal plane knee con...