Abstract
ABSTRACT The purposes of this investigation were to determine the effects of unilateral eccentric-only dynamic constant external resistance (DCER) training on the cross-sectional area (CSA) and strength of the trained and contralateral quadriceps femoris muscles. Sixteen young men (age 24.4 ± 3.7 yrs) volunteered to serve as subjects and were divided into a training (Tr) group and a control (Con) group. The Tr group trained the nondominant limb with eccentric-only leg extension DCER exercise 3 times a week for 8 weeks. Pretraining and posttraining CSA and strength measurements for both the trained and contralateral limbs were determined for all subjects using magnetic resonance imaging scans and eccentric DCER strength tests, respectively. The results indicated there was no significant change in CSA of any muscles of the quadriceps femoris of either the trained or contralateral limb. There was, however, a significant increase in the eccentric DCER strength of both the trained (29%) and contralateral (17%) limbs. The strength changes that were unaccompanied by hypertrophy suggest a neural adaptation.
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