The isokinetic rotator cuff strength ratios in overhead athletes: Assessment and exercise effect

Berckmans, Kelly; Maenhout, Annelies; Matthijs, Lien; Pieters, Louise; Castelein, Birgit; Cools, Ann

doi:10.1016/j.ptsp.2017.03.001

Cited by 31 publications

(25 citation statements)

References 28 publications

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“…The UL ratios of CON and ECC were lower (0.58–0.64) at all speeds except of 120 and 180°/s ND ECC, which considered below normal of 0.66 of concentric with injury risk ( Wathen, 1994 ), with the range of overhead athletes between 0.46 and 1.05 ( Berckmans et al, 2017 ), but with a trend to increase at higher speeds, stressing the differences of the strength of the dominant limb of the IR at low speed, and the greater power of ER at high speed.…”

Section: Discussionmentioning

confidence: 90%

Isokinetic Characteristics of Amateur Boxer Athletes

Tasiopoulos

Nikolaidis²,

Tripolitsioti

et al. 2018

Front. Physiol.

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Aim: The kinetic chain of the punch of boxers is characterized by the contribution of the shoulder; however, the isokinetic muscle strength of shoulder’s rotators muscles has not been well studied so far, especially with regards to performance. Therefore, the aim of the present study was (a) to profile the isokinetic muscle strength of rotators of the glenohumeral joint, bilateral (BL), unilateral (UL) and functional ratios in amateur boxers, and (b) to examine the variation of these muscle strength characteristics by performance level.Methods: Forty male amateur Greek boxers from three division levels (elite, n = 22; second division, n = 11; and third division, n = 7), and 10 non-athletes (control group) were tested, using the isokinetic dynamometer Kin-ComTM in the scapular seated position under standard conditions. We examined (i) peak torque (PT) of internal (IR) and external (ER) rotators during concentric (CON) and eccentric (ECC) contractions at low (60°/s), medium (120°/s), and high speed (180°/s), (ii) BL, (iii) UL, and (iv) functional ratios of dominant (D) and non-dominant (ND) limbs.Results: Boxers were stronger than control group in IR and ER at all speeds, and D outscored ND limb (p < 0.05). Elite boxers were stronger than group B and C (p < 0.05); however, when peak torque was expressed in relative to body mass values, these differences were attenuated. The BL ratios for the men athletes were under 10% at 60 and 180°/s, the UL ratios were lower at 60 and higher at 180°/s and significant lower in the dominant limb at all speeds. The functional ratios of IR ECC / ER CON were higher between the control group at all speeds and the ER ECC/IR CON ratios were between 60 and 180°/s, and the two limbs with higher values at 180°/s.Conclusion: Boxers had the strongest dominant limb and their BL ratios were normal at all speeds except of 120°/s ECC. The UL ratios of ECC at 120 and 180°/s of ND were normal, and at the other speeds abnormal due to high IR. In addition, the functional ratios may be related to the kinetic chain of the punch, which in turn correlates with the contribution of ER of both limbs.

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Section: Discussionmentioning

confidence: 90%

Isokinetic Characteristics of Amateur Boxer Athletes

Tasiopoulos

Nikolaidis²,

Tripolitsioti

et al. 2018

Front. Physiol.

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“…In a systematic review, Edouard et al 46 indicated that the most reliable position for internal rotation (IR) and external rotation (ER) strength assessment was to be seated with 45º of shoulder abduction in the scapular plane. Berckmans et al 16 systematically reviewed 14 studies that examined isokinetic RC strength assessment among healthy overhead athletes and concluded that greater IR force resulted in lower functional deceleration ratio (ER/IR) on the dominant side as compared with the nondominant side. In their systematic review of studies that examined electromyography activity of the shoulder muscles, Spall et al 215 ascertained that RC tears were associated with longer duration of muscle activity in the upper trapezius during glenohumeral movements and greater fatigability of the anterior and middle deltoid during isometric hand gripping and overhead lifting.…”

Section: Resultsmentioning

confidence: 99%

A Systematic Summary of Systematic Reviews on the Topic of the Rotator Cuff

Jancuska

Matthews

Miller

et al. 2018

Orthopaedic Journal of Sports Medicine

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Background:The number of systematic reviews and meta-analyses published on the rotator cuff (RC) has increased markedly.Purpose:To quantify the number of systematic reviews and meta-analyses published on the RC and to provide a qualitative summary of the literature.Study Design:Systematic review; Level of evidence, 4.Methods:A systematic search for all systematic reviews and meta-analyses pertaining to the RC published between January 2007 and September 2017 was performed with PubMed, MEDLINE, and the Cochrane Database of Systematic Reviews. Narrative reviews and non–English language articles were excluded.Results:A total of 1078 articles were found, of which 196 met the inclusion criteria. Included articles were summarized and divided into 15 topics: anatomy and function, histology and genetics, diagnosis, epidemiology, athletes, nonoperative versus operative treatment, surgical repair methods, concomitant conditions and surgical procedures, RC tears after total shoulder arthroplasty, biological augmentation, postoperative rehabilitation, outcomes and complications, patient-reported outcome measures, cost-effectiveness of RC repair, and quality of randomized controlled trials.Conclusion:A qualitative summary of the systematic reviews and meta-analyses published on the RC can provide surgeons with a single source of the most current literature.

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“…Isokinetic strength profiles have been previously described in this context for shoulder and knee joints, for men's handball , soccer , baseball , judo , running ; and women's handball , gymnastics , and wrestling . These studies have provided valuable information about the muscular strength balance (peak torque of the agonist muscle/peak torque of the antagonist muscle) and muscular symmetry between limbs, which have been considered risk factors for injuries in several sports . For example, a balanced strength ratio between the external and internal rotators of shoulders is considered fundamental to ensure that the humeral head is centered in the glenoid , which is of fundamental importance for overhead sports .…”

Section: Introductionmentioning

confidence: 99%