“…In addition, it appears that the inclusion of chains may provide additional advantages over a constant barbell resistance for certain biomechanical and physiological variables. The majority of longitudinal studies that have investigated the effects of combining variable resistance material with freeweights have used rubber bands (2,13,19,21,35). The results have clearly demonstrated that the addition of rubber bands can significantly improve measures of strength and power and those improvements are generally significantly larger than those achieved when using a constant resistance (2,13,35).…”