title: The Chronic Effects of Low- and High-Intensity Resistance Training on Muscular Fitness in Adolescents.
abstract: To compare the effects of high-load, low-repetition maximum (LRM) and low-load, high-repetition maximum (HRM) resistance training regimens on muscular fitness in untrained adolescents. Forty-five untrained adolescents of both sexes (13.7±0.8 years; 161.3±7.5 cm, 56.8±13.4 kg) were randomly assigned into one of three groups: 1) LRM (n = 17): volunteers performed three sets of 4-6-repetition maximum (RM); 2) HRM (n = 16): volunteers performed three sets of 12-15 RM; and 3) control (CON, n = 12). Training was performed two times a week for 9 weeks. After training, there were significant increases in 1 RM chest press (LRM = 14.8% and HRM = 14.2%, p<0.05) and squat (LRM = 26.4% and HRM = 25.7%, p<0.05), with no differences between the LRM and HRM groups (p>0.05). Additionally, muscular endurance increased significantly for the chest press (LRM = 14.5% and HRM = 21.8%, p<0.05) and squat test (LRM = 31.4% and HRM = 32.4%, p<0.05) following resistance training, with no difference between the LRM and HRM groups (p>0.05). These results suggest that both high-load, low-repetition and moderate-load, high-repetition resistance training can be prescribed to improve muscular fitness in untrained adolescents.
authors: College of Physical Education, University of Brasília, Brasília, DF, Brazil.
authors: Ari R
authors: AR
authors: Assunção
authors: College of Physical Education, University of Brasília, Brasília, DF, Brazil.
authors: Martim
authors: M
authors: Bottaro
authors: Federal Institute of Sudeste of Minas Gerais, Campus Rio Pomba, Rio Pomba, MG, Brazil.
authors: João B
authors: JB
authors: Ferreira-Junior
authors: Department of Health Sciences, Public University of Navarre, Campus de Tudela, Tudela, Navarre, Spain.
authors: Mikel
authors: M
authors: Izquierdo
authors: School of Physical Education, Federal University of Rio Grande do Sul, PA, RS, Brazil.
authors: Eduardo L
authors: EL
authors: Cadore
authors: College of Physical Education, Federal University of Goias, Gôiania, GO, Brazil.
authors: Paulo
authors: P
authors: Gentil
mesh_terms: D000293:Adolescent; D005260:Female; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D010807:Physical Endurance; D010809:Physical Fitness; D055070:Resistance Training / Q000379:methods*