AbstractJournal of Sports Science and Physical Education 5(2): 15-23, 2016 - This study was conducted to determine the relationship between lower body muscle architectures and lunges performance. Thirty recreationally active, untrained men (mean age = 22.21 ± 1.59 yrs old) were recruited and involved in two testing sessions; i) anthropometrics and muscle architecture, and ii) multiple-repetition maximum (RM) lunge test. Muscle thickness, pennation angle and fascicle length of vastus lateralis (VL), vastus medialis (VM), rectus femoris (RF) and biceps femoris (BF) were analysed using ultrasonography. Multiple-RM lunge testing was used as an estimation of 1RM lunges performance. Correlation analysis was used to determine the relationship between lower body muscle architectures and lunges performance calculated absolutely and relatively (1RM/body mass). The overall results showed that muscle thickness and pennation angle of all muscles were significantly positive correlated with lunges performan.....