Showing 2 results for Running.
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Volume 0, Issue 0 (11-2019)
Abstract
Background: Despite the relation between nervous system function, fatigue, and co-contraction, it seems that the difference in co-contraction changes due to fatigue induced by sprinting and endurance running probably indicates the dominance of one source of fatigue (central/peripheral) over the other. This study aimed to compare the effect of fatigue induced by endurance running and sprinting on the knee muscle co-contraction in active young women with the approach of identifying the origin of fatigue.
Methodology: Thirteen active young women volunteers (20-30 years, BMI 20-25kg/m2) were randomly selected. Subjects performed fatigue protocols during two sessions with four days of rest in between. The electrical activity of the vastus-medialis and vastus-lateralis muscles was recorded using an electromyography device before and after two stages of running 400-meter (with 100% effort) and 3000-meter (with 50% effort) during the execution of knee extension movement and co-contraction was calculated with the formula. Two-way repeated measure was used to analyze the data.
Results: There was no significant difference between the co-contraction of the selected muscles before and after sprinting (p=0.3) and endurance running (p=0.19) and no significant difference (p=0.85) between the difference in co-contraction rate in the pre-test and post-test of sprinting and endurance running.
Conclusion: Since there was no difference between the effect of fatigue caused by sprinting and endurance running on the co-contraction of the selected muscles, likely, the involvement of central factors in the appearance of fatigue caused by 400-meter sprinting and 3000-meter endurance running is similar and insignificant. The emergence of fatigue after the implementation of both protocols may be more due to environmental factors.
Mansour Eslami, Mohsen Nazari,
Volume 16, Issue 15 (9-2018)
Abstract
All sustained physical activities subject the body to various levels of fatigue. This is especially evident when running, which is one of the most popular forms of exercise and may be described as a reduction in maximum force production and power output . the purpose of this study was to investigate the effect of running in an exerted state on knee muscles power absorption and work during the stance phase of running. Sixteen healthy physical education male students with an average age 22 and SD 2.27 years and height 177 and SD 5.47 cm and mass 72.6 and SD 8.4 kg participated in this study voluntary. Kinetic and kinematic data recorded by using of video camera and force plate. The negative and positive power and work of muscles operating on knee has calculated using inverse dynamic equations in MATLAB2010 Software. Paired sample T test was done to statistical analysis in SPSS 2010 software (p≤0.05). The results of this study indicated that negative peak power and work significantly decreased 33.78% and 22.6% respectively. Although the positive peak power significantly decreased (p≤0.05), positive work didn’t change significantly (p=0.644). The results of this research indicated that the absorbing function of the muscles is decreased following fatigue and may be led to increase the injury risk of running.
