Affiliations: [a] Center of the Studies of Physical Performance, Federal University of Paraná, Curitiba, PR, Brazil | [b] University Positivo, Curitiba, PR, Brazil | [c] Faculty of Health, School of Exercise and Nutrition Sciences, Queensland University of Technology, Brisbane, QLD, Australia
Abstract: BACKGROUND: Pre-exercise stretching is a commonly used practice by many
competitive and recreational athletes. However, the effects of stretching on
muscle performance are still incongruous. Furthermore, there is
conflicting evidence regarding the intensity of stretching and the effect it
has on muscular strength. OBJECTIVE: To investigate the effects of two different intensity
levels of passive static stretching protocols on concentric knee extension
strength. METHODS: Twenty-two male recreational athletes involved in regular
resistance training programs were evaluated using a randomized design.
Subjects performed an isokinetic test of the knee extensors following either
maximal intensity static stretching, submaximal intensity static stretching,
or no stretching. RESULTS: The only significant difference in the peak moment,
amounting to 10.5%, was noted between maximal intensity stretching and no
stretching. CONCLUSION: Maximal intensity stretching of the quadriceps may adversely
affect the acute concentric moment production capacity of these muscles.
