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Rivard J.1, Kring R.2, Cook C.3
1The Ola Grimsby Institute, Academics, Seattle, United States, 2Cleveland Clinic, Cleveland, United States, 3Duke University, Chapel Hill, United States
Background: The literature for the efficacy of exercise for shoulder pain have successfully demonstrated exercise on strength training for hypertrophy or performance, motor control learning, or aerobic capacity and impact on metabolism. Publications have been primarily through the field of Exercise Physiology. A better understanding of the physiological responses to specifically dosed exercise in the patient population would allow the physical therapist to better apply a level of basic science to clinical care.
Purpose: To examine the association between percentage of a repetition maximum in resistance training for rehabilitation and vascular profusion response to a specified load for shoulder training.
Methods: Twelve healthy volunteers were recruited with variances in gender and age between 21 and 60. Following description and consent each subject was tested to assess a percentage of repetition maximum (1-RM) for the exercise utilizing the external rotators. A vascular assessment by laser Doppler was made at three points of testing assessing vascular flow of the posterior rotator cuff. The first was immediately prior to the initiation of exercise, the second immediate following the set of exercise, and a third performed 15 minutes after the discontinuation of the exercise set. Each subject was assessed in this manner at 40%, 60%, and 80% of their 1-RM for external rotation. A random-effects ANOVA model, and incorporate an adjustment for multiple testing, was used to analyze differences pre-exercise and immediately post exercise for the 40%, 60%, and 80% intensities.
Results: A statistically significant difference in vascular perfusion was found at 60% of one Repetition Maximum between pre-exercise and immediately post exercise. With a 95% confidence interval p value was equal to 0.003.
Conclusion(s): A statistically significant increase in vascular perfusion to the posterior rotator cuff was found while performing exercise at 60% of one repetition maximum in healthy individuals.
Implications: When increased local circulation is deemed advantageous during exercise rehabilitation for tissue repair, or if resolution of ischemia is required and/or for performance enhancement, specific dosage of training can positively affect local tissues by increasing local vascular profusion.
Funding acknowledgements: Cleveland Clinic Research Programs Committee grant: supporting novel research in medicine to promote new Investigator, Clinical or Translational research.
Topic: Musculoskeletal
Ethics approval: Institutional Review Board: Cleveland Clinic. Investigators are CITI certified for research ethics, method, and privacy for humans and animals.
All authors, affiliations and abstracts have been published as submitted.
