INTRODUCTION: In the training of cross-country skiing, the adequate control of the exercise intensities in the base training with equal to or lower than lactate threshold (LT), speed training equal to or lower than onset of bold lactate accumulation (OBLA), and maximum training equal to or higher than OBLA are important themes with regard to enhancing the training effect. In cross-country skiing, roller ski or pole walk is implemented as a part of the summer training. The purpose of this study was to clarify the relationship between exercise styles and lactate curve by performing each lactate curve test in the roller ski and the pole walk. METHOD: 1. Study subjects were the top 20 Japanese university Student athletes (10 males and 10 females). 2. Lactate Curve Test using the Roller Ski. The field test was implemented using an all-weather track (level ground) with a 500 m circuit. Free technique (V1 or V2) was used as the test technique. Regarding the basics of the technique, gliding distance was gradually extended from 600 m at the start to 700 m and finally to 800 m by adding 100 m, with a 3 minute time limit for each distance, resulting in a gradually increasing burden method. After the completion of each trial, heart rate and lactate value were measured and then lactate curve was drawn up. 3. Lactate Curve Test using the Pole Walk. The laboratory test was implemented with a gradually increasing burden method using a treadmill track. Every 3 minutes, heart rate and lactate value were measured immediately before the ACSM intensity increased, and then lactate curve was drawn up. 4. Data processing. First, average values of heart rates in the ranges of equal to or less than LT, LT to OBLA, and equal to or more than OBLA were measured during the roller ski and the pole walk by each subject. In addition, average values and their standard deviations were calculated from the average values of each subject. Then, two-way analysis of variance was carried out for the exercise style factor and lactate value factor. RESULTS: As the result of the two-way analysis of variance, simple main-effect test was performed, because the interaction of the result was significant. Next, the following results were demonstrated: the group members with equal to or less than LT at the completion of the roller ski, and the members with LT to OBLA and equal to or more than OBLA at the completion of the pole walk had significantly high heart rate, (Figure 1). In this regard, however, when paying attention to individual athletes, individual differences were observed among those athletes such as having almost the same heart rates and large difference between the roller ski and the pole walk. DISCUSSION: Regarding the roller ski, it seems that the lower heart rates were observed compared with those of the pole walk in the group with the intensity of equal to or more than LT, because the burden for muscle groups in the upper body increases as exercise intensity increases more.
© Copyright 2010 Book of Abstracts. 5th International Congress on Science and Skiing, Dec. 14 - 19, 2010, St. Christoph am Arlberg. Veröffentlicht von University of Salzburg, Interfakultärer Fachbereich Sport- und Bewegungswissenschaft/USI. Alle Rechte vorbehalten.