The Effects of Different Conditioning Contraction Protocols of Post-activation Potentiation on Variables of Eccentric Phases and Concentric Phase of Countermovement Jump

Abstract

Abstract Purpose Investigation of the influence of different conditioning contraction protocols on the eccentric variables: depth of descent of body centre of mass (CMJ) and capacity of muscle force, power, and velocity (CMJ), i.e., height of jump. Methods In a sample of 28-students (age: pretest 19.5 ± 1.0; posttest 19.7 ± 1.1), 1 RM was determined by estimating 10 RM, to be stratified in a six-week workout: static-hold back squat at 120°, dynamic-back squat at 120° (x8), combined-2 back squat at 120° and 2 seconds endurance (x2) [for 12 seconds], and control group-6 to 8 hours of activity per week. After the pre-contractions, they continuously performed shock-plyometrics (50 cm box), triple jump and 5-meter sprint. Training load was 80% 1 RM. Results A statistically significant increase (13.3%) was found in variable of power unlike variable (CMJ) V ecc and static i.e., dynamic groups where significant differences between pretest and posttest performance from 12.9 and 5.9% were found. Concentric variable (CMJ) H exhibits significance for ED and EC groups (6.8, 8.9%, p ≤ 0.05). Conclusion The most indicated increases (CMJ) H, by practicing contrast sessions i.e., conditioning contraction (CC) or post-activation potentiation, were observed after the application of combined i.e., dynamic conditioning contractions, referring to sublimated eccentric manifestation and concentric muscular effect.