Contralateral Repeated Bout Effect of the Elbow Flexors Not Observed In Young Women

Brown, Bailey (2019) Contralateral Repeated Bout Effect of the Elbow Flexors Not Observed In Young Women. Undergraduate thesis, under the direction of Ling Xin from Exercise Science, University of Mississippi.

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The contralateral repeated bout effect (CL-RBE) is known as a protective effect in which an initial bout of eccentric exercise reduces muscle damage in the contralateral limb after a similar bout of eccentric exercise. To our knowledge, previous studies on CL-RBE only recruited males or a mixture of both sexes. PURPOSE: To investigate the presence of the CL-RBE of the elbow flexors in women. METHODS: Twelve healthy women (20.9 ± 2.5 years) performed two bouts of 45 maximal eccentric contractions (ECC) of the elbow flexors using the opposite arm separated by 14 days. The isokinetic muscle strength (60°/sec) was measured pre-exercise, immediately post-exercise, and 24 and 48 h post-exercise. Limb girth, range of motion (ROM), and muscle soreness were measured pre-exercise, and at 24 and 48 h post-exercise. Surface Electromyography (EMG) was recorded during both exercise bouts from the biceps brachii muscle. Data of all variables were analyzed using two-way repeated measures ANOVA (Bout × Time) except that of EMG amplitude and median frequency (MF), which was analyzed via paired t-test. RESULTS: The isokinetic strength was significantly reduced after the eccentric exercise for both bout 1 (-19.3 ± 17.4%, P < 0.01) and bout 2 (-15.3 ± 15.2%, P < 0.01). Significant main effects of time were also observed for muscle soreness and ROM. Limb girth, EMG amplitude, and MF did not change significantly (P > 0.05) after either exercise bout. There were no significant differences between bouts for all the measured variables. CONCLUSION: The CL-RBE of elbow flexors was not evident in young healthy women. This was probably because the initial bout of exercise did not induce enough damage to bring about the CL-RBE in the second bout or the CL-RBE in women lasted shorter than two weeks.

Item Type: Thesis (Undergraduate)
Creators: Brown, Bailey
Student's Degree Program(s): B.S. in Exercise Science
Thesis Advisor: Ling Xin
Thesis Advisor's Department: Exercise Science
Institution: University of Mississippi
Subjects: Q Science > QM Human anatomy
Depositing User: Bailey Brown
Date Deposited: 06 May 2019 15:39
Last Modified: 06 May 2019 15:39

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