Time-course of physiological and rating of perceived exertion responses during judo combats
Introduction: As judo combat can last from few seconds up to more than 5-min, it is important to understand the physiological responses in different time frames (Franchini et al., 2013). Thus, the objective of the present study was to compare the physiological and perceptive responses to judo combats with different durations.
Methods: Ten male adult judo athletes (74±11 kg; 176±6 cm) performed five combats with different durations (1, 2, 3, 4 and 5 minutes) randomly determined, against the same opponent, in different days and blinded to the time duration. After each combat the rating of perceived exertion (RPE) and heart rate (HR) were measured. Blood lactate concentrations ([La]) were measured at rest and 1, 3 and 5 min after the combat. Delta of [La] was determined using the highest minus the rest values. Moreover, the increment in RPE and [La] per minute of combat was also determined. An one-way ANOVA with repeated measurements and the Bonferroni test were used to compare the different time durations. Effect sizes were calculated (eta squared;ç2). Significance level was set at 5%.
Results: RPE was affected by combat duration (P<0.001; ç2=0.66), with lower values for 1min (11±2) compared to 2min (14±1), 3min (14±2), 4min (16±2) and 5min (16±2) conditions, and lower values in the 2min compared to 5min condition. HR also differed between conditions (P<0.001; ç2=0.45), with lower values in the 1min (159±13 bpm) compared to 2min (172±8 bpm), 3min (173±8 bpm), 4min (175±6 bpm) and 5min (174±6 bpm) conditions. The delta [La] (P<0.001; ç2=0.63) values in the 4min (8.55±1.88 mmol/L) and 5min (9.42±1.86 mmol/L) were higher than in the 1min (4.78±1.59 mmol/L) and 2min (6.22±1.41 mmol/L) conditions. The values in the 5min were also higher than in the 3min (6.73±1.77 mmol/L). When time of combat was considered a decrease (P<0.001; ç2=0.90) in the RPE was observed, with significant differences between all conditions: 1min (11±2 a.u/min), 2min (7±1 a.u/min), 3min (5±1 a.u/min), 4min (4±0 a.u/min) and 5-min (3±0 a.u/min). The increase in [La] per min also differed between conditions (P<0.001; ç2=0.77), with higher increase in the 1min (4.78±1.59 mmol/L/min) compared to the 2min (3.11±0.71 mmol/L/min), 3min (2.24±0.59 mmol/L/min), 4min (2.14±0.47 mmol/L/min) and 5min (1.88±0.37 mmol/L/min) conditions and higher in the 2min compared to the 5min condition.
Discussion: The highest changes in the magnitude of physiological and perceptive responses occur at the beginning of the match, which suggest that judo athletes seem to modulate their effort thereafter, suggesting the occurrence of a pacing strategy.
© Copyright 2014 19th Annual Congress of the European College of Sport Science (ECSS), Amsterdam, 2. -5. July 2014. Published by VU University Amsterdam. All rights reserved.
|Subjects:||judo competition load perception load intensity|
|Notations:||biological and medical sciences combat sports|
|Published in:||19th Annual Congress of the European College of Sport Science (ECSS), Amsterdam, 2. -5. July 2014|
|Editors:||A. De Haan, C. J. De Ruiter, E. Tsolakidis|
VU University Amsterdam
|Document types:||congress proceedings