J Strength Cond Res. 2013 Nov 22. [Epub ahead of print]
Predicting Punching Acceleration from Selected Strength and Power Variables in Elite Karate Athletes: A Multiple Regression Analysis.
1Pão de Açúcar Group - Nucleus of High Performance in Sport, São Paulo, SP, Brazil 2Martial Arts and Combat Sports Research Group, School of Physical Education and Sport, University of São Paulo, SP, Brazil 3Laboratory of Applied Nutrition and Metabolism, School of Physical Education and Sport, University of São Paulo, SP, Brazil 4School of Physical Education and Sport, University of São Paulo, São Paulo, SP, Brazil 5Brazilian Karate Confederation, Brazil.
The present study investigated the relationship between punching acceleration and selected strength and power variables in nineteen professional karate athletes from the Brazilian National Team (9 men and 10 women; age: 23 ± 3 years; height: 1.71 ±0.09 m and body mass: 67.34 ± 13.44 kg). Punching acceleration was assessed under four different conditions in a randomized order: 1) fixed distance aiming to attain maximum speed (FS); 2) fixed distance aiming to attain maximum impact (FI); 3) self-selected distance aiming to attain maximum speed (SSS) and 4) self-selected distance aiming to attain maximum impact (SSI). The selected strength and power variables were as follows: maximal dynamic strength in bench press and squat-machine, squat and countermovement jump height, mean propulsive power in bench throw and jump squat, and mean propulsive velocity in jump squat with 40% of body mass. Upper and lower-body power and maximal dynamic strength variables were positively correlated to punch acceleration in all conditions. Multiple regression analysis also revealed predictive variables: relative mean propulsive power in squat jump (W/kg), and maximal dynamic strength (1RM) in both bench press and squat-machine exercises. An impact-oriented instruction and a self-selected distance to start the movement seem to be crucial to reach the highest acceleration during punching execution. This investigation, while demonstrating strong correlations between punching acceleration and strength-power variables, also provides important information for coaches, especially for designing better training strategies to improve punching speed.