The aim of this study was to determine the energy expenditure and energy system contributions in three different judo techniques: o-uchi-gari (leg, OUG), morote-seoi-nage (arm, MS) and harai-goshi (hip, HG). Twelve black belt judo athletes (21±5 years-old, 74±11 kg, 175±6 cm, 14±5 years of judo) participated in this study. Each subject was submitted to a 5-min protocol for each technique, with 40-60 min interval. During each session the athlete applied the technique, throwing an opponent one time at each 15s. VO² and heart rate were measured at rest, continuously during the 5-min period and 6-min after the effort. Blood lactate was measured at rest, 1, 3 and 5 min after each protocol. Energy system contributions and total energy expenditure were calculated as described by Bertuzzi et al (2007). Physiological responses to the techniques were compared through an ANOVA with repeated measures, followed by a Tukey test (P<0.05). The main differences found were: VO² (ml.kg-1.min-1) was higher for MS (33.71±5.68) than for OUG (29.97±6.10); anaerobic alactic contribution (kJ) was higher for MS (46±20) and HG (43±21) techniques compared to OUG (36±22); relative anaerobic alactic contribution (%) was higher for MS (16.3±2.7) and HG (16.1±2.7) techniques compared to OUG (14.6±2.8); aerobic contribution (kJ) was higher for MS (223+66) than for OUG (196±74); total energy expenditure (kJ) was higher for MS (273±86) than for OUG (237±99). No other differences were found among techniques. The main conclusions are: (1) during this common used judo exercise, the oxidative system provides most of the energy yield; (2) MS was more demanding and can be more fitted to physical conditioning in a specific setting; (3) although techniques differed in VO² and anaerobic alactic contribution, heart rate was not different among them, indicating that it can not be accurate to quantify the energy expenditure or intensity in this kind of exercise.
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