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Medicine & Science in Sports & Exercise:
doi: 10.1249/01.mss.0000222835.28273.80
BASIC SCIENCES: Original Investigations

ACE ID Genotype and the Muscle Strength and Size Response to Unilateral Resistance Training

PESCATELLO, LINDA S.1; KOSTEK, MATTHEW A.1; GORDISH-DRESSMAN, HEATHER2; THOMPSON, PAUL D.3; SEIP, RICHARD L.3; PRICE, THOMAS B.3 4; ANGELOPOULOS, THEODORE J.5; CLARKSON, PRISCILLA M.6; GORDON, PAUL M.7; MOYNA, NIALL M.8; VISICH, PAUL S.9; ZOELLER, ROBERT F.10; DEVANEY, JOSEPH M.2; HOFFMAN, ERIC P.2

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Abstract

Purpose: To examine associations among the angiotensin I-converting enzyme (ACE) insertion (I)/deletion (D) polymorphism and the response to a 12-wk (2 d·wk−1) unilateral, upper-arm resistance training (RT) program in the trained (T, nondominant) and untrained (UT, dominant) arms.

Methods: Subjects were 631 (mean ± SEM, 24.2 ± 0.2 yr) white (80%) men (42%) and women (58%). The ACE ID genotype was in Hardy-Weinberg equilibrium with frequencies of 23.1, 46.1, and 30.8% for ACE II, ID, and DD, respectively (χ2 = 1.688, P = 0.430). Maximum voluntary contraction (MVC) and one-repetition maximum (1RM) assessed peak elbow flexor muscle strength. Magnetic resonance imaging measured biceps muscle cross-sectional area (CSA). Multiple variable and repeated-measures ANCOVA tested whether muscle strength and size differed at baseline and pre- to post-RT among T and UT and ACE ID genotype.

Results: Baseline muscle strength and size were greater in UT than T (P < 0.001) and did not differ among ACE ID genotype in either arm (P ≥ 0.05). In T, MVC increases were greater for ACE II/ID (22%) than DD (17%) (P < 0.05), whereas 1RM (51%) and CSA (19%) gains were not different among ACE ID genotype pre- to post-RT (P ≥ 0.05). In UT, MVC increased among ACE II/ID (7%) (P < 0.001) but was similar among ACE DD (2%) pre- to post-RT (P ≥ 0.05). In UT, 1RM (11%) and CSA (2%) increases were greater for ACE DD/ID than ACE II (1RM, 7%; CSA, −0.1%) (P < 0.05). ACE ID genotype explained approximately 1% of the MVC response to RT in T and approximately 2% of MVC, 2% of 1RM, and 4% of CSA response in UT (P < 0.05).

Conclusion: ACE ID genotype is associated with the contralateral effects of unilateral RT, perhaps more so than with the muscle strength and size adaptations that result from RT.

©2006The American College of Sports Medicine

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