Certificate in Physical Training and Soccer Methodology
How do you achieve achieve and manage the balance between physical and tactical training? This course that question and takes you through soccer specific physical
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Stretching is used to increase the range of motion around the joint, prevent injury, and also is recommended to improve athletic performance; however, recent investigators have reported that acute and prolonged stretching may reduce athletic performance through decrements in strength, power, vertical jump and sprint performance, balance, and movement time.
The stretch-induced decreases in force have been attributed to both neural (motor unit activation, firing frequency, and reflex sensitivity) and/or mechanical factors (muscle stiffness).
To examine the effect of static stretching of the lower limbs on maximal voluntary contraction (MVC) and isometric force-time curve characteristics of leg extensor muscles, and electromyography (EMG) activity of rectus femoris, biceps femoris, and gastrocnemius.
A within subjects experimental design. Participants: Ten healthy physical education students (age, 19.7 ± 1.4 years; height, 177 ± 4.8 cm; body mass, 72.6 ± 8.4 kg) were tested after jogging and a jogging/stretch protocol of the lower limbs.
The stretching protocol involved a 10 min jog and seven static stretching exercises for the major muscle groups of the lower limbs.
Measurements included the maximal voluntary contraction (MVC) of leg extensors, the time achieved to the MVC (TMVC), the force exerted during the first 100ms of the contraction (F100), the index of relative force (IRF), the index of force development rate (IFDR), and the average integrated EMG activity (AEMG) of the rectus femoris, biceps femoris, and gastrocnemius.
There were slight but no significant changes in MVC (1%), TMVC (4.8%), F100 (7.8%), IRF (1%), and IFDR (3.5%) between jogging and jogging/stretch measurement. A significant difference (21%; P<0.05) in AEMG of rectus femoris was found between jogging and jogging/stretch mea- surement, whereas AEMG of biceps femoris and gastrocnemius were unaltered.
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