title: The role of volume-load in strength and absolute endurance adaptations in adolescent's performing high- or low-load resistance training.
abstract: This study compared high- (HL) and low-load (LL) resistance training (RT) on strength, absolute endurance, volume-load, and their relationships in untrained adolescents. Thirty-three untrained adolescents of both sexes (males, n = 17; females, n = 16; 14 ± 1 years) were randomly assigned into either (i) HL (n = 17): performing 3 sets of 4-6 repetitions to momentary concentric failure; or (ii) LL (n = 16): performing 2 sets of 12-15 repetitions to momentary concentric failure. RT was performed for 2×/week for 9 weeks. Change in maximum strength (1 repetition maximum) and absolute muscular endurance for barbell bench press was assessed. Weekly volume-load was calculated as sets (n) × repetitions (n) × load (kg). Ninety-five percent confidence intervals (CIs) revealed that both groups significantly increased in strength and absolute endurance with large effect sizes (d = 1.51-1.66). There were no between-group differences for change in strength or absolute endurance. Ninety-five percent CIs revealed that both groups significantly increased in weekly volume-load with large effect sizes (HL = 1.66, LL = 1.02). There were no between-group differences for change in volume-load though average weekly volume-load was significantly greater for LL (p < 0.001). Significant Pearson's correlations were found for the HL group between average weekly volume-load and both strength (r = 0.650, p = 0.005) and absolute endurance (r = 0.552, p = 0.022) increases. Strength and absolute endurance increases do not differ between HL and LL conditions in adolescents when performed to momentary concentric failure. Under HL conditions greater weekly volume-load is associated with greater strength and absolute endurance increases.
authors.affiliation: a School of Sport, Health and Social Sciences, Southampton Solent University, Southampton, Hampshire SO14 0YN, UK.
authors.forename: James
authors.initials: J
authors.lastname: Steele
authors.affiliation: a School of Sport, Health and Social Sciences, Southampton Solent University, Southampton, Hampshire SO14 0YN, UK.
authors.forename: James P
authors.initials: JP
authors.lastname: Fisher
authors.affiliation: b College of Physical Education, University of Brasília, Brasília, DF 70910-970, Brazil.|c Integrated Center of Physical Activity, Brasilia, DF 70390-070, Brazil.
authors.forename: Ari R
authors.initials: AR
authors.lastname: Assunção
authors.affiliation: b College of Physical Education, University of Brasília, Brasília, DF 70910-970, Brazil.
authors.forename: Martim
authors.initials: M
authors.lastname: Bottaro
authors.affiliation: d College of Physical Education, Federal University of Goias, Gôiania, GO 74960-900, Brazil.
authors.forename: Paulo
authors.initials: P
authors.lastname: Gentil
mesh_terms: D000222:Adaptation, Physiological; D000293:Adolescent; D041923:Adolescent Development; D001938:Brazil; D017079:Exercise Tolerance; D005260:Female; D006801:Humans; D008297:Male; D024510:Muscle Development; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000254:growth & development / Q000502:physiology*; D010807:Physical Endurance; D005082:Physical Exertion; D055070:Resistance Training / Q000379:methods*; D014891:Weight Lifting; D016474:Weight-Bearing
keywords: charge de travail; entraînement à la force; population de jeunes; programme; programming; strength training; workload; youth populations