KEY WORDS: Kung-fu, training, combat sports.

Participants
Four male volunteers (age = 22.5 ± 2.08 years, weight = 62.1 ± 9.01 kg, height = 1.73 ± 0.08 m) of the Wushu regional team from south of Brazil participated of study. They had, at least, 8 years of training experience and gave their written informed consent before participating in the study. The protocol was approved by UFRGS' Ethical Committee. An acknowledged limitation of the present study is the relatively small sample size. It should be noted that all elite athletes of Wushu regional team volunteered to participate in this study and clearly future research should use a larger size.

Experimental protocol
Heart rate and blood lactate were measured before non-standardised 10-min warm-up. The athletes were asked to perform the same warm-up exercises from your training workout consisting of static and dynamic stretching exercises, and 10-min after warm-up HR and lactate were measured. Post-exercise HR and 5-min post-exercise La were registered. To mimic the competition effort, a simulated competition mode was used motivating combatants. The tests were performed at morning on two separate days with 48 h interval in a randomized order. Athletes were fasted and blood samples were collected from ear lobe in a seated position. The HR was measured through a cardio-tachometer (Polar S610, USA) and blood lactate using a Lactate Analyzer (Roche Accusport, GER).

Statistics
Data are expressed as mean ± SD. Mann-Whitney test was used for comparisons of HR and La between forms. The level of significance was set at p < 0.05.

Resting HR was 76 ± 7 and 78 ± 9 bpm for Changquan and Daoshu, respectively. Pre-exercise HR was 82 ± 5 and 83 ± 7 bpm for Changquan and Daoshu, respectively. There were no significant differences between resting and pre-exercise HR for both forms. Immediately after the forms execution, HR values were 176 ± 3 and 176 ± 2 bpm for Changquan and Daoshu, respectively. This result represents 89% of age-predicted maximal heart rate (220-age). Post-exercise HR was significant greater than resting and pre-exercise values for both forms. Resting blood lactate values were 1.80 ± 0.36 and 1.33 ± 0.43 mmol·l^-1. Pre-exercise blood lactate values were 2.05 ± 0.21 and 1.80 ± 0.24 mmol·l^-1. There were no significant differences between resting and pre-exercise HR for both forms (p < 0.05). Five minutes after forms execution, La values were 4.38 ± 1.63 and 5.15 ± 1.07 mmol·l^-1 for Changquan and Daoshu, respectively. Post-exercise La was significant greater than resting and pre-exercise La for both forms (p < 0.05). There was no significant difference for HR and La between two forms.

The American College of Sports Medicine (ACSM, 1990) recommends 3 to 5 days/week, 60 to 90% of maximal HR (HRmax) or 50 to 85% of maximal oxygen uptake (VO₂max) and 20 to 60 min of continuous aerobic activity to development of cardio-respiratory fitness. The studies of combined and selected techniques from katas (Schmidt and Royer, 1973; Shaw and Deutsch, 1982; Pieter et al., 1990) that evaluates HR without VO₂ measure, suggest that karate exercises could raise HR to the level for enhance cardiovascular fitness. Findings from the present study demonstrate that athletes performing modern Wushu forms attained 89% of age-predicted Hrmax, a level of workload that is in the range recommended by ACSM and, thus, suggests its use for training.

Zehr and Sale, 1993 evaluated the efficacy of Chito Ryu Seisan Kata like aerobic power training method. HR and VO₂max were evaluated continuously through katas execution in moderate and intense paces. The HR was, respectively, 93 ± 6 and 101 ± 3% of HRmax obtained in maximal cycle ergometer test. There were no differences between paces. Karate katas could cause desired effects of cardiovascular training when performed in intense pace. However, Shaw and Deutsch, 1982 inicated that a training program should not use only one kata, but importantly, they indicated that higher HR were associated with high intensity kata. Among a sample of professional karate athletes, Schmidt and Royer, 1973 demonstrated an average HR of 144.5 (138-152) bpm which means 80% of their Hrmax. Interestingly, the protocol used by Pieter et al., 1990 lends support to using a similar form of training method, showing taekwondo athletes reported increased HR to 80% of age-predicted HRmax.

The present study also demonstrated that blood lactate increase to 4.38 ± 1.63 and 5.15 ± 1.07 mmol·l^-1 for Changquan and Daoshu forms, respectively. Anaerobic threshold have been considered like 4 mmol·l^-1 (Heck et al., 1985). Zehr and Sale, 1993 also measure blood lactate during Chito Ryu Seisan Kata performed in moderate and intense paces. The results represent 11.5 and 22.2%, respectively, of peak values from maximal cycle ergometer test. Faster pace produces significant higher response. Blood lactate responses to beginning level form (Ki Cho I) of Moo Duk Tkow, a taekwondo subdivision, was investigated by another study (Hetzler et al., 1989), and lactate value increases to 3.23 ± 1.56 mmol·l^-1. Blood lactate levels changes with exercise intensity, but another factors can contribute. In the present study, there were no significant differences between Changquan and Daoshu (the late performed with sword). This means that the use of sword does not increase workload.

Present study demonstrates that modern Wushu athletes attained 89% of age-predicted HRmax and 4.0 to 5.0 mmol·l^-1 of blood lactate after performing Changquan and Daoshu forms. In addition, there were no significant differences between forms. However, it's important more studies that analyze physiological responses of Wushu combatants to this sport. If these parameters will be confirmed, specific training could be developed to enhance aerobic fitness in the combat sport of Wushu. The Wushu katas could be used to develop aerobic fitness with these reference values serving to training goal.

The authors would like to thank Sports Ministry of Brazil.

• Heart rate and lactate responses are not significantly different between Changquan and Daoshu forms for Wushu combatants.
• The Wushu katas could be used to develop aerobic fitness.