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Upper Limb Injury
The effect of progressive endurance-strength training and electrical stimulation on muscle strength and surface electromyography parameters in volleyball players with infraspinatus syndrome
  1. N Shavandi,
  2. R S Hoseini
  1. Arak University, Arak, Iran
  1. Email: rahman.pt82{at}


Background Infraspinatus syndrome is a condition of painless weakness and atrophy of the infraspinatus muscle that results from suprascapular neuropathy.

Objectives Survey the effects of a short term progressive endurance-strength training program and electrical stimulation on elite volleyball players with infraspinatus syndrome.

Design Randomized clinical trial with control group.

Setting and participants National team players.

Participants 12 volleyball players with Infraspinatus syndrome were randomly divided to two groups: progressive endurance-strength training (six persons) and electrical stimulation (six persons). 20 healthy players were also used as a control group.

Intervention Therapeutic exercises and electrical stimulation were performed for 8 weeks in both intervention groups.

Main outcomes Surface electromyography of infraspinatus and tress minor muscles and maximal isometric strength of external rotator muscles before and after interventions.

Results 32 players were studied in three groups: progressive endurance-strength (6 persons, age), electrical stimulation (six persons) and a control group (20 persons, age 25/1±4/2, height 187/7±3/9, weight 75/6±7/1, sport history 9±3/8 and national team history 3/9±2/3). After 8 weeks, maximal isometric strength of the external rotators in both experimental groups was increased significantly, but there were no significant changes observed in IEMG and RMSEMG.

Conclusions Progressive endurance-strength training and electrical stimulation can result in an increase of maximal isometric strength of the shoulder external rotator muscles. But both therapeutic methods have no effect on electromyograghic parameters in infraspinatus and tress minor muscles. It seems that we can't use surface electromyography for detecting the effect of these protocols on above the muscles.

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