RESUMO
The objective of this study was to compare the effects of static stretching exercises and stationary cycling on hip range of motion measures immediately following exercise and after a 15-min period of rest or continued activity. The results showed that both exercises performed for equal time periods resulted in hip range of motion increases with no significant difference (p < 0.05) between the immediate effects of the two exercises. Fifteen minutes of cycling or inactivity did not result in significant differences (p < 0.05) from the initial gains resulting from the stretching, but did result in significant increases in hip flexion for the group that continued cycling. Based on the results of this study, static stretching and cycling were equally effective for increasing range of motion and retaining the increase for a 15-min period in a controlled environment, independent of activity.J Orthop Sports Phys Ther 1984;6(2):104-109.
RESUMO
A work-energy approach was used to determine the contributions of the muscles crossing the hip, knee and ankle joints to the total positive work done during maximal vertical jumps. It was found that the average relative contributions of the ankle and hip muscles were approximately 23 and 28% respectively, with the remaining 49% of the work being done by the muscles acting at the knee joint. The efficiency of jumping, i.e. the ratio of potential energy gained to the net mechanical work done by the muscles acting at the three lower limb joints was nearly 1.0. These results stress the importance of all three major leg extensor muscle groups to the performance of an explosive activity such as vertical jumping. It is suggested that the work-energy approach supplies useful information concerning joint contributions without the problems associated with other techniques.