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Concentric and eccentric muscle fatigue of the shoulder rotators
by
Mullaney MJ, McHugh MP.
—
last modified
2009-10-09 15:17
Int J Sports Med. 2006 Sep;27(9):725-9. Epub 2006 Feb 1.
Previous research has demonstrated fatigue resistance for eccentric compared with
concentric muscle contractions in the lower extremity. The purpose of this study
was to determine if eccentric fatigue resistance was also evident in the internal
and external rotators of the shoulder. Ten subjects performed three sets of 32
maximum isokinetic contractions in shoulder internal and external rotation at 120
degrees/s. One arm performed eccentric contractions and the contralateral arm
performed concentric contractions. Subjects were also tested for isometric
strength prior to and immediately following the isokinetic contractions. Percent
change in isokinetic torque (first five repetitions versus last five for each
set) and isometric torque was compared between the arms performing eccentric and
concentric contractions. Fatigue with isokinetic contractions was not different
between eccentric and concentric internal rotation (25 % vs. 26 %, p = 0.76) and
external rotation (24 % vs. 32 %, p = 0.11). Similarly, fatigue with isometric
contractions was not different between eccentric and concentric internal rotation
(11 % vs. 5 %. p = 0.33) and external rotation (15 % vs. 7 %, p = 0.07). These
results indicate that unlike previously described fatigue resistance for
eccentric muscle contractions in the quadriceps, dorsiflexors and plantarflexors,
fatigue was not different between eccentric and concentric muscle contractions of
the internal and external rotators of the shoulder.