Variation Characteristics Of Static Stretching On Force And Reaction Time

Purposes:By testing the explosive forces and reactions after skeletal muscle pull,the characteristics of changes in force output and reaction ability before and after pulling are analyzed,which provides a theoretical basis for how to carry out pulling more quickly for a sport requiring rapid response and greater power output.Methods:13 healthy male college students were selected as test subjects.Using the Kistler three-dimensional force table,subjects were tested for static force between 1s and 300 s before and after pulling.Using the self-made luminescence reaction device,the surface myoelectric signals of the medial gastrocnemius muscle,the lateral gastrocnemius muscle,the soleus muscle,and the tibialis anterior muscle were collected and recorded.The total reaction time,pre-response time,and electricity of the three muscles at different time points before and after pulling were analyzed.Changes in mechanical delay.Results:(1)the explosive force decreased immediately after the pull,and decreased to the minimum at 2s after the pull,recovered at 5 seconds after the pull and gradually exceeded before the pull,before 150 s after the pull,There was no significant difference between before pulling and pulling.(2)The TRT within 10 s after traction was significantly higher than that before traction(p <0.01),and gradually recovered within 5min after traction.The TRT after 240 s was less than that before traction and 10 s after TRT,The difference was not statistically significant.(3)There was no significant difference in the ratio of PMT between before and after stretching of soleus muscle and tibialis anterior muscle.The medial gastrocnemius muscle PMT increased significantly at 1 second and before distraction(p <0.05),while there was no significant difference at other time points compared with that before distraction.The lateral PMT of the lateral gastrocnemius muscle during 10 seconds after traction was significantly higher than that before traction(p <0.05 or p <0.01).No significant difference between the other periods and before pulling.The PMT of the triceps and tibialis anterior muscles shortened and was shorter than the level of the anterior tibia(p> 0.05)at about 5 min after the traction.Conclusions: Static traction has no significant effect on explosive force,but there is a prolonged reaction after stretching.Electromechanical delay changes are particularly significant,which may be related to changes in muscle tendon complex stiffness,nerve modulation,and muscle tissue changes.