Affiliations: [a] Department of Physical Medicine and Rehabilitation,
University Hospital of Saint-Etienne, Faculty of Medicine, Jean Monnet
University, Saint-Etienne, France | [b] Department of Clinical Physiology and Exercise,
University Hospital of Saint-Etienne, Faculty of Medicine, Jean Monnet
University, Saint-Etienne, France
Note: [] Address for correspondence: Pascal Edouard, MD, MSc, Department
of Physical Medicine and Rehabilitation, LPE EA 4338, Bellevue Hospital,
University Hospital of Saint-Etienne, 42 055 Saint-Etienne cedex 2, France.
Tel.: +33 674~574 691; E-mail: [email protected]
Abstract: Background: Although there have been many studies on isokinetic
shoulder exercises in evaluation and rehabilitation programs, the
cardiovascular and metabolic responses of those modes of muscle strength
exercises have been poorly investigated. Objective: To analyze cardiovascular and metabolic responses during a standardized test used to study
the internal (IR) and external (ER) rotators maximal isokinetic strength. Methods: Four days after an incremental exercise test on cycle ergometer, ten
healthy subjects performed an isokinetic shoulder strength evaluation with
cardiovascular (Heart rate, HR) and metabolic gas exchange (�O_{2})
analysis. The IR and ER isokinetic strength, measured in seated position with
45° of shoulder abduction in scapular plane, was evaluated
concentrically at 60, 120 and 240°/s and eccentrically at 60°/s,
for both shoulder sides. An endurance test with 30 repetitions at 240°/s
was performed at the end of each shoulder side testing. Results: There was a significant increase of mean HR with isokinetic exercise (P< 0.05).
Increases of HR was 42–71% over the resting values. During endurance
testing, increases of HR was 77–105% over the resting values, and
corresponded to 85–86% of the maximal HR during incremental test. Increase
of �O_{2} during isokinetic exercises was from 6–11 ml/min/kg to
20–43 ml/min/kg. Conclusion: This study performed significant
cardiovascular and metabolic responses to isokinetic exercise of rotators
shoulder muscles. A warm-up should be performed before maximal high-intensity
isokinetic shoulder testing. Our results indicated that observation and
supervision are important during testing and/or training sessions, especially
in subjects with risk for cardiovascular disorders.
