The Effect of SLS Weightlifting Chains vs Conventional Back Squat on Lower Body Post Activation Potentiation

Abstract

The purpose of this study was to examine the effect of SLC weighlifting chains on post activation potentiation in comparison to conventional weightlifting methods. 8 male rugby union players (mean ±SD age 20.4± 1.4 years, height height 179.2± 5.2 cm, and body mass 87.1± 11.8 kg) performed a counter- movement jump (CMJ) followed by a 10 minute rest and one of the conditioning contractions. Following a 12 minute rest, another CMJ was performed by each subject. The conditioning contractions were performed on separate days and in a randomized order. 1 repetition maximum (1RM) was determined for both standard back squat and back squat with SLC weightlifting chains (mean ±SD 1RM back squat 138.75± 25.7kg 1RM back squat with SLC chains 146.86± 27.02). Subjects performed 3 repetitions at 86% of 1RM on the respective squats. A control measure was also in place, in which the subjects would rest in the time slot they would normally be squatting. Peak power (P peak) peak force (F peak) total displacement (D max) and rate of force development (RFD) were measured using a linear position transducer. Electromyography (EMG) of the vastus lateralis, vastus medialis and bicep femoris was also recorded and analyzed. Data analysis revealed that SLC chains produced significantly higher Dmax ( 0.041± 0.021; P<0.05). No significant differences were revealed for RFD, Ppeak or Fpeak. EMG data was not significantly different between pre and post conditioning contraction when comparing the standard back squat and the back squat performed with SLC chains (P>0.05). Dmax was the only performance measure to improve following a squat with the SLC weightlifting chains.