Resistance training does not induce uniform adaptations to quadriceps.

Autor: Mangine GT; Exercise Science and Sport Management, Kennesaw State University, Kennesaw, Georgia, United States of America., Redd MJ; Institute of Exercise Physiology and Wellness, University of Central Florida, Orlando, Florida, United States of America., Gonzalez AM; Department of Health Professions, Hofstra University, Hempstead, New York, United States of America., Townsend JR; Exercise and Nutrition Science, Lipscomb University, Nashville, Tennessee, United States of America., Wells AJ; Institute of Exercise Physiology and Wellness, University of Central Florida, Orlando, Florida, United States of America., Jajtner AR; Exercise Science/Physiology, Kent State University, Kent, Ohio, United States of America., Beyer KS; Institute of Exercise Physiology and Wellness, University of Central Florida, Orlando, Florida, United States of America., Boone CH; Institute of Exercise Physiology and Wellness, University of Central Florida, Orlando, Florida, United States of America., La Monica MB; Institute of Exercise Physiology and Wellness, University of Central Florida, Orlando, Florida, United States of America., Stout JR; Institute of Exercise Physiology and Wellness, University of Central Florida, Orlando, Florida, United States of America., Fukuda DH; Institute of Exercise Physiology and Wellness, University of Central Florida, Orlando, Florida, United States of America., Ratamess NA; Health & Exercise Science, The College of New Jersey, Ewing, New Jersey, United States of America., Hoffman JR; Institute of Exercise Physiology and Wellness, University of Central Florida, Orlando, Florida, United States of America.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2018 Aug 30; Vol. 13 (8), pp. e0198304. Date of Electronic Publication: 2018 Aug 30 (Print Publication: 2018).
DOI: 10.1371/journal.pone.0198304
Abstrakt: Resistance training may differentially affect morphological adaptations along the length of uni-articular and bi-articular muscles. The purpose of this study was to compare changes in muscle morphology along the length of the rectus femoris (RF) and vastus lateralis (VL) in response to resistance training. Following a 2-wk preparatory phase, 15 resistance-trained men (24.0 ± 3.0 y, 90.0 ± 13.8 kg, 174.9 ± 20.7 cm) completed pre-training (PRE) assessments of muscle thickness (MT), pennation angle (PA), cross-sectional area (CSA), and echo-intensity in the RF and VL at 30, 50, and 70% of each muscle's length; fascicle length (FL) was estimated from respective measurements of MT and PA within each muscle and region. Participants then began a high intensity, low volume (4 x 3-5 repetitions, 3min rest) lower-body resistance training program, and repeated all PRE-assessments after 8 weeks (2 d ∙ wk-1) of training (POST). Although three-way (muscle [RF, VL] x region [30, 50, 70%] x time [PRE, POST]) repeated measures analysis of variance did not reveal significant interactions for any assessment of morphology, significant simple (muscle x time) effects were observed for CSA (p = 0.002) and FL (p = 0.016). Specifically, average CSA changes favored the VL (2.96 ± 0.69 cm2, p < 0.001) over the RF (0.59 ± 0.20 cm2, p = 0.011), while significant decreases in average FL were noted for the RF (-1.03 ± 0.30 cm, p = 0.004) but not the VL (-0.05 ± 0.36 cm, p = 0.901). No other significant differences were observed. The findings of this study demonstrate the occurrence of non-homogenous adaptations in RF and VL muscle size and architecture following 8 weeks of high-intensity resistance training in resistance-trained men. However, training does not appear to influence region-specific adaptations in either muscle.
Competing Interests: The authors have declared that no competing interests exist.
Databáze: MEDLINE
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