Changes in Flexibility and Force are not Different after Static Versus Dynamic Stretching.

Area of Science:

• Biomechanics
• Exercise Physiology
• Sports Medicine

Background:

• Stretching is commonly used to improve flexibility and performance.
• Understanding the distinct effects of static versus dynamic stretching is crucial for optimizing training protocols.
• Previous research has yielded mixed results regarding the comparative efficacy of different stretching modalities.

Purpose of the Study:

• To compare the acute effects of static stretching versus dynamic stretching on knee flexor range of motion (ROM), passive torque (PT) at pain onset, passive stiffness, and isometric muscle force.
• To determine if significant differences exist between static and dynamic stretching protocols in these physiological measures.

Main Methods:

• A randomized crossover trial involving 16 healthy young men.
• Participants performed 300 seconds of either active static or dynamic stretching of the right knee flexors on separate days.
• Measurements of ROM, PT at pain onset, passive stiffness, and isometric knee flexion force were taken immediately before and after each stretching session using an isokinetic dynamometer.

Main Results:

• Both static and dynamic stretching significantly increased ROM and PT at pain onset (p<0.01).
• Both stretching methods significantly decreased passive stiffness and isometric knee flexion force (p<0.01).
• No significant differences in the magnitude of change were observed between static and dynamic stretching for any measured variable.

Conclusions:

• A total of 300 seconds of either static or dynamic stretching can acutely enhance flexibility and reduce passive stiffness.
• Both stretching techniques lead to a decrease in isometric muscle force.
• The acute effects of static and dynamic stretching on the measured parameters appear to be comparable.