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: 1) HL (n=17): performing 3 sets of 4-6 repetitions to momentary concentric failure; or 2) LL (n=16): performing 3 sets of 12-15 repetitions to momentary concentric failure. RT was performed 2x/week for 9 weeks. Change in maximum strength (1 RM) and absolute muscular endurance for barbell bench press was assessed. Weekly volume-load was calculated as sets [no.] x repetitions [no.] x load [kg]. 95% confidence intervals (CIs) revealed 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. 95%CIs revealed 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.