Effectiveness of a Home-Based Eccentric-Exercise Program on the Torque-Angle Relationship of the Shoulder External Rotators: A Pilot Study.

نویسندگان

  • Timothy L Uhl
  • Thomas Rice
  • Brianna Papotto
  • Timothy A Butterfield
چکیده

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.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Reliability of Isometric and Eccentric Isokinetic Shoulder External Rotation.

CONTEXT Shoulder external rotators are challenged eccentrically throughout the deceleration phase of throwing, which is thought to contribute to overuse injuries. To evaluate the effectiveness of intervention programs, as well as identifying deficits, reliable and responsive measures of isometric and eccentric shoulder external rotation are necessary. Previously, isometric measures have primari...

متن کامل

The effect of knee valgus control feedback exercise on pain, hip torque and performance variables in participants with patellofemoral pain

 Aims and background: Patellofemoral pain syndrome (PFPS) is a common knee disorder frequently occurred in young females. Abnormalities of lower limb movement patterns during weight-bearing activities can directly affect referred pain. The purpose of this study was to determine the effect of knee valgus control feedback exercise on pain, eccentric hip muscle torque, performance and knee angle i...

متن کامل

Angle Specific Analysis of Side-to-Side Asymmetry in the Shoulder Rotators

Although side-to-side asymmetry of the shoulder rotators calculated by independent peak torque (IPT) has been used for interpretation of injury risks in athletes, it may not measure strength through the entire range of motion (ROM) tested. The aim of this study was to compare side-to-side asymmetry of the shoulder rotators between independent peak torque (IPT) and ten-degree angle specific torq...

متن کامل

Effects of 8 weeks of water-based exercise on the lower limb muscles strength in Parkinson\'s

 Introduction: Muscular weakness, particularly weakness of lower limb muscles is a symptom of Parkinson disease, which, together with other symptoms, will result in a variety of movement disorders. This research is designed to assess the effectiveness of a water-based exercise program on the lower limb muscles strength of Parkinson patients' knee joints. Materials and Methods: In a semi-exp...

متن کامل

مقایسه گشتاور ایزوکینتیک عضلات اینترنال واکسترنال روتاتور شانه در سمت غالب بین زنان ورزشکار حرفه ای تنیس و والیبال

Background: The purpose of this study was to measure isokinetic maximum and average peak torque of internal and external rotators of glenohumeral joint in volley ball and tennis players Methods: This study was performed on 17 professional female athletes (7 tennis players ;10 volleyball players) with age ranged 18-28 years. The subjects had played in a skilled team for more than 3 years. The...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Journal of sport rehabilitation

دوره 26 2  شماره 

صفحات  -

تاریخ انتشار 2017