Effectiveness of a home-based eccentric-exercise program on the torque-angle relationship of the shoulder external rotators: A pilot study

Timothy L. Uhl, Thomas Rice, Brianna Papotto, Timothy A. Butterfield

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Context: The role of the rotator cuff is to provide dynamic stability to the glenohumeral joint. Human and animal studies have identified sarcomerogenesis as an outcome of eccentric training indicated by more torque generation with the muscle in a lengthened position. Objective: The authors hypothesized that a home-based eccentric-exercise program could increase the shoulder external rotators' eccentric strength at terminal internal rotation (IR). Design: Prospective case series. Setting: Clinical laboratory and home exercising. Participants: 10 healthy subjects (age 30 ± 10 y). Intervention: All participants performed 2 eccentric exercises targeting the posterior shoulder for 6 wk using a home-based intervention program using side-lying external rotation (ER) and horizontal abduction. Main Outcome Measures: Dynamic eccentric shoulder strength measured at 60°/s through a 100° arc divided into 4 equal 25° arcs (ER 50-25°, ER 25-0°, IR 0-25°, IR 25-50°) to measure angular impulse to represent the work performed. In addition, isometric shoulder ER was measured at 5 points throughout the arc of motion (45° IR, 30° IR, 15° IR, 0°, and 15° ER). Comparison of isometric and dynamic strength from pre- to posttesting was evaluated with a repeated-measure ANOVA using time and arc or positions as within factors. Results: The isometric force measures revealed no significant differences between the 5 positions (P = .56). Analysis of the dynamic eccentric data revealed a significant difference between arcs (P = .02). The percentage-change score of the arc of IR 25-50° was found to be significantly greater than that of the arc of IR 0-25° (P = .007). Conclusion: After eccentric training the only arc of motion that had a positive improvement in the capacity to absorb eccentric loads was the arc of motion that represented eccentric contractions at the longest muscle length.

Original languageEnglish
Pages (from-to)141-150
Number of pages10
JournalJournal of Sport Rehabilitation
Volume26
Issue number2
DOIs
StatePublished - Mar 1 2017

Bibliographical note

Publisher Copyright:
© 2017 Human Kinetics, Inc.

Keywords

  • Exercise therapy
  • Isokinetic dynamometer
  • Muscle strength
  • Sarcomerogenesis

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation

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