Loaded jumps are often included in training programs due to the relative simplicity of completing them, and because they are thought to be similar to that of the countermovement vertical jump (CMVJ). The purpose of this study was to assess system and joint mechanical differences between unloaded (UL) CMVJ two different types of loaded jumps commonly programmed for athletes with a light (20% back squat 1-rep max) and heavy (60%) conditions. Due to the nature of how strength practitioners develop training programs for their athlete, single subject analysis (SSA) was included to supplement the results of the group-level statistics. The loaded conditions completed were with a straight bar placed across the upper back (SBJ) and with a hexagonal barbell held at arms’ length (HBJ). Power-based metrics are often used to determine the effectiveness of LJ performance during training. Recently, some researchers have suggested that momentum may be a more useful metric for assessing LJ performance because, unlike peak power, decreases in velocity do not automatically result in decreased momentum. Kinetic and kinematic data were collected synchronously using two force platforms and a three-dimensional motion capture system, respectively. A convenience sample of 15 males and 20 females were recruited to participate in this study. Jump height and peak power were decreased from UL to all loaded conditions, but momentum measurements varied for all individual participants. Countermovement (CM) depth, along with CM temporal, RFD, and joint power and work of the hip, knee, and ankle statistically varied in the loaded conditions compared to UL. The results of this study suggest that momentum may be a better metric for assessing LJ performance than peak power, and that individual participants may alter their execution strategies to overcome the addition of an external load.