Dynamic Stretching Improves Sprint Performance
>> December 30, 2010
So what does it tell you? if you are a 10-flat sprinter, will you automatically run 9.90? (not that simple!)
Dynamic stretching has been increasingly studied since the 1998 study by Kokkonen and his colleagues that reported detrimental effects of static stretching (negative effect on athletic performance).
Before we discuss the details lets define "stretching". Broadly, stretching is a physical activity, whereby the limbs or muscles will experience "lengthening" until at the point that some tension is felt. There are different types of stretching.
Static stretching
In contrast, static stretching is a constant stretch held at an end point of ROM. This means that the stretching involves "hold" at the end of ROM (for each repetition) for a given time. Typically, athletes performs static stretching for 20 to 60 seconds per muscle group.
Traditionally, static stretching is performed by athletes in order to reduce the risk of injury. This argument however has not been fully supported by scientific literature.
Our studies
Despite such important findings, "heavy" static stretching are still very commonly practiced by athletes. I’ve seen Commonwealth champions and even World class athletes who are still considering static stretching, or even passive-static stretching (with partner), or a combination of static and dynamic stretching before training and competitions.
Dynamic Stretching called 'Scorpion' to stretch lower back and hip flexor muscles area |
For athletes, why considers dynamic stretching instead of static stretching? There are physiological reasons behind it, but in this short article we try to discuss a few.
- Static stretching promotes compliance or gap in the tendon and muscles. This is especially when the duration of stretching is too long (e.g. sets of >30 secs).
- This phenomenon is also called musculotendinous slackness, which reduces muscle stiffness. For a sprinter, stiffness is needed to optimize power production.
- Reduced muscle stiffness may actually affects muscular contraction because of delayed electromechanical process or transmission of forces.
- Hence, static stretching may compromise your muscles to perform maximally.
- Dynamic stretching mimics most of actions seen in many athletic activities, including the qualities seen in sprinting. This simply includes the stretch-shortening cycle actions, like squat jumps, "pogo jumps" (toe taps), high knees (flexing and extension actions), and so on.
- Other examples, like hamstring kicks (if done correctly) are also specific to leg swing movements during sprinting.
- These movements can promote readiness of the neuromuscular system that important for maximal performance.
- Furthermore, dynamic stretching can help increase core temperature to a greater extent than the static stretching.
(1) Mark Kovacs (2010). Dynamic Stretching (the Revolutionary New Warm-up Method to Improve Power, Performance and Range of Motion).
(2) Fletcher and B. Jones (2004). The effect of different warm-up stretch protocols on 20 meter sprint performance in trained rugby union players.
(3) Arnold G. Nelson, Nicole M. Driscoll, Dennis K. Landin, Michael A. Young, & Irving C. Schexnayder (2005). Acute effects of passive muscle stretching on sprints performances.
Photos: copied from notarunner.com & flex4fitness.com