Abstract
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°/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.
Key words
Internal rotation - external rotation - isometric maximum voluntary contraction
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M. J. Mullaney
Nicholas Institute of Sports Medicine & Athletic Trauma
Lenox Hill Hospital
130 East 77th Street
New York, NY 10021
USA
Phone: + 2124344802
Email: Mike@nismat.org