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Scapular muscle recruitment pattern: electromyographic response of the trapezius muscle to sudden shoulder movement before and after a fatiguing exercise

Ann Cools UGent, Erik Witvrouw UGent, Geert A De Clercq, Lieven Danneels UGent, Tine Willems UGent, Dirk Cambier UGent and Michael L Voight (2002) JOURNAL OF ORTHOPAEDIC & SPORTS PHYSICAL THERAPY. 32(5). p.221-229
abstract
Study Design: Test-retest reliability study and single-group repeated measures design. Objectives: To evaluate the muscle latency times of the 3 portions of the trapezius muscle to a sudden arm movement in normal shoulders and to determine if this recruitment pattern is altered as a result of fatigue, Background: It has been suggested that shoulder impingement may be related to altered muscle activity and muscle fatigue in the scapular stabilizers. Fatigue-induced changes in latency times of the trapezius might influence scapular stability, Methods and Measures: Muscle latency times were investigated in 30 healthy shoulders with surface electromyography, Muscle activity was measured in all 3 sections of the trapezius and the middle deltoid muscle during a sudden downward falling movement of the arm. Subsequently the shoulder was fatigued on an isokinetic dynamometer, after which muscle latency time measurement was repeated. Results: ANOVA for repeated measures revealed significant differences in latency times (P < 0.05) among the 4 muscles of interest. Although there were no significant differences among the 3 sections of the trapezius muscle, them all were recruited after the initialization of the deltoid muscle. The recruitment order of the shoulder muscles did not c hange with muscle fatigue. However, after fatigue. muscle responses were significantly slower in all muscles except for the lower trapezius (P < 0 05), Conclusions: There is a specific recruitment sequence in the shoulder muscles in response to a sudden arm movement characterized by initial activation of the middle deltoid muscle and followed by simultaneous contraction of all 3 sections of the trapezius. This muscle activation pattern is delayed but not altered with fatigue.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
muscle latency times, scapular stabilizers, NEUROMUSCULAR PERFORMANCE, IMPINGEMENT SYNDROME, PROPRIOCEPTION, muscular balance, FIBER TYPE COMPOSITION, neuromuscular properties, ENZYME-HISTOCHEMICAL CHARACTERISTICS, TRANSVERSUS ABDOMINIS, ATHLETIC SHOULDER, ARM ABDUCTION, LOWER-LIMB, CONTRACTION
journal title
JOURNAL OF ORTHOPAEDIC & SPORTS PHYSICAL THERAPY
J. Orthop. Sports Phys. Ther.
volume
32
issue
5
pages
221 - 229
Web of Science type
Article
Web of Science id
000175322100006
JCR category
ORTHOPEDICS
JCR impact factor
0.69 (2002)
JCR rank
23/42 (2002)
JCR quartile
3 (2002)
ISSN
0190-6011
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
315057
handle
http://hdl.handle.net/1854/LU-315057
date created
2005-06-14 15:16:00
date last changed
2010-10-14 14:57:32
@article{315057,
  abstract     = {Study Design: Test-retest reliability study and single-group repeated measures design.
Objectives: To evaluate the muscle latency times of the 3 portions of the trapezius muscle to a sudden arm movement in normal shoulders and to determine if this recruitment pattern is altered as a result of fatigue,
Background: It has been suggested that shoulder impingement may be related to altered muscle activity and muscle fatigue in the scapular stabilizers. Fatigue-induced changes in latency times of the trapezius might influence scapular stability,
Methods and Measures: Muscle latency times were investigated in 30 healthy shoulders with surface electromyography, Muscle activity was measured in all 3 sections of the trapezius and the middle deltoid muscle during a sudden downward falling movement of the arm. Subsequently the shoulder was fatigued on an isokinetic dynamometer, after which muscle latency time measurement was repeated.
Results: ANOVA for repeated measures revealed significant differences in latency times (P {\textlangle} 0.05) among the 4 muscles of interest. Although there were no significant differences among the 3 sections of the trapezius muscle, them all were recruited after the initialization of the deltoid muscle. The recruitment order of the shoulder muscles did not c hange with muscle fatigue. However, after fatigue. muscle responses were significantly slower in all muscles except for the lower trapezius (P {\textlangle} 0 05),
Conclusions: There is a specific recruitment sequence in the shoulder muscles in response to a sudden arm movement characterized by initial activation of the middle deltoid muscle and followed by simultaneous contraction of all 3 sections of the trapezius. This muscle activation pattern is delayed but not altered with fatigue.},
  author       = {Cools, Ann and Witvrouw, Erik and De Clercq, Geert A and Danneels, Lieven and Willems, Tine and Cambier, Dirk and Voight, Michael L},
  issn         = {0190-6011},
  journal      = {JOURNAL OF ORTHOPAEDIC \& SPORTS PHYSICAL THERAPY},
  keyword      = {muscle latency times,scapular stabilizers,NEUROMUSCULAR PERFORMANCE,IMPINGEMENT SYNDROME,PROPRIOCEPTION,muscular balance,FIBER TYPE COMPOSITION,neuromuscular properties,ENZYME-HISTOCHEMICAL CHARACTERISTICS,TRANSVERSUS ABDOMINIS,ATHLETIC SHOULDER,ARM ABDUCTION,LOWER-LIMB,CONTRACTION},
  language     = {eng},
  number       = {5},
  pages        = {221--229},
  title        = {Scapular muscle recruitment pattern: electromyographic response of the trapezius muscle to sudden shoulder movement before and after a fatiguing exercise},
  volume       = {32},
  year         = {2002},
}

Chicago
Cools, Ann, Erik Witvrouw, Geert A De Clercq, Lieven Danneels, Tine Willems, Dirk Cambier, and Michael L Voight. 2002. “Scapular Muscle Recruitment Pattern: Electromyographic Response of the Trapezius Muscle to Sudden Shoulder Movement Before and After a Fatiguing Exercise.” Journal of Orthopaedic & Sports Physical Therapy 32 (5): 221–229.
APA
Cools, Ann, Witvrouw, E., De Clercq, G. A., Danneels, L., Willems, T., Cambier, D., & Voight, M. L. (2002). Scapular muscle recruitment pattern: electromyographic response of the trapezius muscle to sudden shoulder movement before and after a fatiguing exercise. JOURNAL OF ORTHOPAEDIC & SPORTS PHYSICAL THERAPY, 32(5), 221–229.
Vancouver
1.
Cools A, Witvrouw E, De Clercq GA, Danneels L, Willems T, Cambier D, et al. Scapular muscle recruitment pattern: electromyographic response of the trapezius muscle to sudden shoulder movement before and after a fatiguing exercise. JOURNAL OF ORTHOPAEDIC & SPORTS PHYSICAL THERAPY. 2002;32(5):221–9.
MLA
Cools, Ann, Erik Witvrouw, Geert A De Clercq, et al. “Scapular Muscle Recruitment Pattern: Electromyographic Response of the Trapezius Muscle to Sudden Shoulder Movement Before and After a Fatiguing Exercise.” JOURNAL OF ORTHOPAEDIC & SPORTS PHYSICAL THERAPY 32.5 (2002): 221–229. Print.