The Effects of Accentuated Eccentric Loading Schemes on Concentric Power Output during the Back Squat Performed by Resistance Trained Men

Previous research has indicated that resistance training utilizing accentuated eccentric loading patterns augments concentric outputs. Mechanical stretch coupled with eccentric overload may potentiate the concentric phase of the back squat. Therefore, it is important to understand the various mechanisms involved and their potential relation to increased concentric back squat performance. Purpose: The aim of the study was to examine the differences in power output in college aged resistance trained males performing traditional and AEL back squats. Subjects: Eight male volunteers (N= 8) agreed to participate in the present study (age: 23.8 ± 1.6 years, mass: 84.3 ± 11.7 kg, height: 174 ± 9 cm). All subjects had previous experience in resistance training and were free from musculoskeletal injuries for up to one year. The subjects were asked to complete three experimental conditions during which kinetic data was collected. The three conditions were: Traditional (80/80% 1RM), AEL1 (105/80% 1RM), AEL2 (110/80% 1RM). Two repetitions were performed for each condition. Average power output was collected immediately following each repetition during the back squat. Results: The results showed a significant difference (p = 0.002) between the conditions. There was a significant (p = 0.009) decrease in average power output from the AEL2 condition compared to the traditional and AEL1 condition. Conclusion: Utilizing AEL patterns did not have any advantage over traditional loading patterns in terms of enhancing average power production. The eccentric overload prescribed in the AEL2 condition may have been too much for the current population noted by the decrease in performance. Future research is warranted on finding the optimal eccentric load to enhance concentric performance.