title: The relationship between maximal repetition performance and muscle fiber type as estimated by noninvasive technique in the quadriceps of untrained women.
abstract: The purpose of this investigation was to establish a relationship between the number of repetitions an individual can complete at a predetermined load and their percentage of type II muscle fibers in their quadriceps. Subjects included 22 untrained women between the ages of 18 and 35. Day 1 consisted of noninvasive anthropologic testing, 1 repetition maximum (1RM) testing, and recording repetition performance at 70% 1RM. Day 2 consisted of isokinetic dynamometry to determine muscle fiber composition. Results were obtained and analyzed using the Pearson product correlation coefficient (r). The results demonstrated a fair-to-moderate relationship (Pearson r = -0.48, p = 0.02) that individuals with greater percentages of type II muscle fibers performed fewer repetitions at 70% 1RM. The results of this study demonstrate that muscle fiber type composition is an important variable to consider when designing training or rehabilitation programs.
authors.affiliation: Department of Physical Therapy, New York Institute of Technology, Old Westbury, NY 11568, USA. pdouris@nyit.edu
authors.forename: Peter C
authors.initials: PC
authors.lastname: Douris
authors.forename: Benjamin P
authors.initials: BP
authors.lastname: White
authors.forename: Robert R
authors.initials: RR
authors.lastname: Cullen
authors.forename: William E
authors.initials: WE
authors.lastname: Keltz
authors.forename: John
authors.initials: J
authors.lastname: Meli
authors.forename: Dan M
authors.initials: DM
authors.lastname: Mondiello
authors.forename: David
authors.initials: D
authors.lastname: Wenger
mesh_terms: D000293:Adolescent; D000328:Adult; D005080:Exercise Test; D005260:Female; D006801:Humans; D009119:Muscle Contraction / Q000502:physiology*; D018656:Muscle Fibers, Fast-Twitch / Q000502:physiology*; D053580:Muscle Strength / Q000502:physiology; D053581:Muscle Strength Dynamometer; D018482:Muscle, Skeletal / Q000502:physiology