Muscle performance during isokinetic concentric and eccentric abduction in subjects with subacromial impingement syndrome

Abstract

Peak torque (PT), total work (TW) and acceleration time (AT) were measured during isokinetic concentric and eccentric abduction of the shoulder in subjects with subacromial impingement syndrome (SIS) and healthy subjects. The SIS group consisted of 27 subjects (33.48 +/- 9.94 years) with unilateral SIS and it was divided into two groups: (1) SIS with the dominant involved side, (2) SIS with the nondominant involved side. The control group consisted of 23 healthy subjects (32.26 +/- 9.04 years). PT, TW and AT were measured bilaterally at 60 and 180 degrees /s. No significant interactions were found between group and side (P > 0.05), as well as no significant main effects of group and side (P > 0.05) for all variables during concentric abduction of the shoulder at both tested speeds. During the eccentric contractions, lower TW (P < 0.05) was demonstrated by the nondominant uninvolved side of SIS group at 60 degrees /s, and by the uninvolved sides of the SIS groups at 180 degrees /s compared to the dominant side of the controls. At 180 degrees /s, the nondominant uninvolved side of the SIS group demonstrated slower AT (P < 0.05) compared to the dominant side of the control group, as well as the nondominant involved side of the SIS group compared to the nondominant side of the controls. The results showed no alterations in the measured parameters during concentric and eccentric phases of isokinetic abduction in subjects with SIS when compared to a control group. However, alterations may be observed in the contralateral side during the eccentric phase of abduction in subjects with unilateral conditions of SIS.

Eccentric training for shoulder abductors improves pain, function and isokinetic performance in subjects with shoulder impingement syndrome: a case series

“…Isokinetic testing has been demonstrated to be reliable and valid to assess the shoulder complex 17 . However, it should be considered that this kind of testing is not specific to a certain muscle 25 , it evaluates the performance of a muscle group in a determined movement.…”

“…Ultrasonography improves the differential diagnosis for shoulder pain as it has high sensitivity (98.1%) for identifying rotator cuff tears 24 . Other studies also used ultrasonography in the evaluation of patients with SIS 6,11,25 .…”

“…The acromioclavicular joint was aligned over the rotational machine axis. Previous studies have used this positioning to test the subjects during isokinetic abduction 25,33 . Although studies recommend abduction with glenohumeral internal rotation (empty can) to better activate the supraspinatus 3,36 , we performed a pilot study where the participants were not able to perform abduction with internal rotation without increasing pain; therefore, neutral rotation was used for evaluations and intervention.…”

Comparing of the Efficacy and Effectiveness of Isokinetic Exercise, Laser, Pseudoiontophoresis and Iontophoresis Treatments According to the Stage in Treatments of Subacromial Impingement Syndrome

“…Kas gücünde artma hastalık şiddetinde ve ağrılarda azalma sağlamıştır. 24 İzokinetik dinamometre ile omuzun her yö-nüne yaptırdığımız egzersiz programı sonucunda, tüm skorlarda hem tedavi öncesine göre hem de diğer 3 gruba göre daha fazla düzelme olduğunu saptadık. Ayrıca evreler açısından karşılaştırıldığında da en fazla düzelmenin tüm skorlarda izokinetik egzersiz programında olduğunu gördük.…”

Analysis of acceleration time of ankle in long-distance runners and triathletes

“…7,11,22,23,24,26 Two of those studies addressed ankle and provide information about neuromuscular characteristics, 7,22 while the other studies analyzed other joints. 11,23,24,26 van Cingel et al 7 reported that subjects with chronic ankle instability showed prolonged acceleration times for the evertor muscles (concentric action) at 30°/s and 120°/s as well as for the invertor muscles (concentric action) at 120°/s, when compared with control subjects. So, the authors suggested that these findings could be related to the inversion trauma and consequently slower motor nerve conduction velocity of the fibular nerve.…”