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Acromiohumeral distance and 3-dimensional scapular position change after overhead muscle fatigue

Annelies Maenhout UGent, Famke Dhooge, Maarten Van Herzeele, Tanneke Palmans UGent and Ann Cools UGent (2015) JOURNAL OF ATHLETIC TRAINING. 50(3). p.281-288
abstract
Context: Muscle fatigue due to repetitive and prolonged overhead sports activity is considered an important factor contributing to impingement-related rotator cuff pathologic conditions in overhead athletes. The evidence on scapular and glenohumeral kinematic changes after fatigue is contradicting and prohibits conclusions about how shoulder muscle fatigue affects acromiohumeral distance. Objective: To investigate the effect of a fatigue protocol resembling overhead sports activity on acromiohumeral distance and 3-dimensional scapular position in overhead athletes. Design: Cross-sectional study. Setting: Institutional laboratory. Patients or Other Participants: A total of 29 healthy recreational overhead athletes (14 men, 15 women; age = 22.23 +/- 2.82 years, height = 178.3 +/- 7.8 cm, mass = 71.6 +/- 9.5 kg). Intervention(s): The athletes were tested before and after a shoulder muscle-fatiguing protocol. Main Outcome Measure(s): Acromiohumeral distance was measured using ultrasound, and scapular position was deter-mined with an electromagnetic motion-tracking system. Both measurements were performed at 3 elevation positions (08, 458, and 608 of abduction). We used a 3-factor mixed model for data analysis. Results: After fatigue, the acromiohumeral distance increased when the upper extremity was actively positioned at 45 degrees (Delta = 0.78 +/- 0.24 mm, P = .002) or 60 degrees (Delta = 0.58 +/- 0.23 mm, P = .02) of abduction. Scapular position changed after fatigue to a more externally rotated position at 45 degrees (Delta = 4.97 degrees +/- 1.13 degrees, P < .001) and 60 degrees (Delta = 4.61 degrees +/- 1.90 degrees, P < .001) of abduction, a more upwardly rotated position at 45 degrees (Delta = 6.10 degrees +/- 1.30 degrees, P < .001) and 60 degrees (Delta = 7.20 degrees +/- 1.65 degrees, P < .001) of abduction, and a more posteriorly tilted position at 0 degrees, 45 degrees, and 60 degrees of abduction (Delta = 1.98 degrees +/- 0.41 degrees, P < .001). Conclusions: After a fatiguing protocol, we found changes in acromiohumeral distance and scapular position that corresponded with an impingement-sparing situation.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
subacromial impingement syndrome, shoulder, injury prevention, ultrasonography, EXTERNAL ROTATION FATIGUE, SCAPULOHUMERAL RHYTHM, IMPINGEMENT SYNDROME, INTERNAL-ROTATION, GLENOHUMERAL KINEMATICS, SHOULDER IMPINGEMENT, SUBACROMIAL SPACE, PATHOLOGY, SYMPTOMS, ATHLETE
journal title
JOURNAL OF ATHLETIC TRAINING
J. Athl. Train.
volume
50
issue
3
pages
281 - 288
Web of Science type
Article
Web of Science id
000360828300008
JCR category
SPORT SCIENCES
JCR impact factor
2.224 (2015)
JCR rank
21/82 (2015)
JCR quartile
2 (2015)
ISSN
1062-6050
DOI
10.4085/1062-6050-49.3.92
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
5713349
handle
http://hdl.handle.net/1854/LU-5713349
date created
2014-09-29 15:36:13
date last changed
2016-12-19 15:39:34
@article{5713349,
  abstract     = {Context: Muscle fatigue due to repetitive and prolonged overhead sports activity is considered an important factor contributing to impingement-related rotator cuff pathologic conditions in overhead athletes. The evidence on scapular and glenohumeral kinematic changes after fatigue is contradicting and prohibits conclusions about how shoulder muscle fatigue affects acromiohumeral distance. 
Objective: To investigate the effect of a fatigue protocol resembling overhead sports activity on acromiohumeral distance and 3-dimensional scapular position in overhead athletes. 
Design: Cross-sectional study. 
Setting: Institutional laboratory. 
Patients or Other Participants: A total of 29 healthy recreational overhead athletes (14 men, 15 women; age = 22.23 +/- 2.82 years, height = 178.3 +/- 7.8 cm, mass = 71.6 +/- 9.5 kg). 
Intervention(s): The athletes were tested before and after a shoulder muscle-fatiguing protocol. 
Main Outcome Measure(s): Acromiohumeral distance was measured using ultrasound, and scapular position was deter-mined with an electromagnetic motion-tracking system. Both measurements were performed at 3 elevation positions (08, 458, and 608 of abduction). We used a 3-factor mixed model for data analysis. 
Results: After fatigue, the acromiohumeral distance increased when the upper extremity was actively positioned at 45 degrees (Delta = 0.78 +/- 0.24 mm, P = .002) or 60 degrees (Delta = 0.58 +/- 0.23 mm, P = .02) of abduction. Scapular position changed after fatigue to a more externally rotated position at 45 degrees (Delta = 4.97 degrees +/- 1.13 degrees, P {\textlangle} .001) and 60 degrees (Delta = 4.61 degrees +/- 1.90 degrees, P {\textlangle} .001) of abduction, a more upwardly rotated position at 45 degrees (Delta = 6.10 degrees +/- 1.30 degrees, P {\textlangle} .001) and 60 degrees (Delta = 7.20 degrees +/- 1.65 degrees, P {\textlangle} .001) of abduction, and a more posteriorly tilted position at 0 degrees, 45 degrees, and 60 degrees of abduction (Delta = 1.98 degrees +/- 0.41 degrees, P {\textlangle} .001). 
Conclusions: After a fatiguing protocol, we found changes in acromiohumeral distance and scapular position that corresponded with an impingement-sparing situation.},
  author       = {Maenhout, Annelies and Dhooge, Famke and Van Herzeele, Maarten and Palmans, Tanneke and Cools, Ann},
  issn         = {1062-6050},
  journal      = {JOURNAL OF ATHLETIC TRAINING},
  keyword      = {subacromial impingement syndrome,shoulder,injury prevention,ultrasonography,EXTERNAL ROTATION FATIGUE,SCAPULOHUMERAL RHYTHM,IMPINGEMENT SYNDROME,INTERNAL-ROTATION,GLENOHUMERAL KINEMATICS,SHOULDER IMPINGEMENT,SUBACROMIAL SPACE,PATHOLOGY,SYMPTOMS,ATHLETE},
  language     = {eng},
  number       = {3},
  pages        = {281--288},
  title        = {Acromiohumeral distance and 3-dimensional scapular position change after overhead muscle fatigue},
  url          = {http://dx.doi.org/10.4085/1062-6050-49.3.92},
  volume       = {50},
  year         = {2015},
}

Chicago
Maenhout, Annelies, Famke Dhooge, Maarten Van Herzeele, Tanneke Palmans, and Ann Cools. 2015. “Acromiohumeral Distance and 3-dimensional Scapular Position Change After Overhead Muscle Fatigue.” Journal of Athletic Training 50 (3): 281–288.
APA
Maenhout, A., Dhooge, F., Van Herzeele, M., Palmans, T., & Cools, A. (2015). Acromiohumeral distance and 3-dimensional scapular position change after overhead muscle fatigue. JOURNAL OF ATHLETIC TRAINING, 50(3), 281–288.
Vancouver
1.
Maenhout A, Dhooge F, Van Herzeele M, Palmans T, Cools A. Acromiohumeral distance and 3-dimensional scapular position change after overhead muscle fatigue. JOURNAL OF ATHLETIC TRAINING. 2015;50(3):281–8.
MLA
Maenhout, Annelies, Famke Dhooge, Maarten Van Herzeele, et al. “Acromiohumeral Distance and 3-dimensional Scapular Position Change After Overhead Muscle Fatigue.” JOURNAL OF ATHLETIC TRAINING 50.3 (2015): 281–288. Print.