Author(s): VANASANT, T., CHIDNOK, W., Institution: SPORTS AUTHORITY OF THAILAND, Country: THAILAND, Abstract-ID: 204

INTRODUCTION:
According to the Critical Power (CP) concept, exercising at an intensity below the CP or Lactate Threshold (LTP) allows the body to maintain a physiological steady state. However, once the intensity exceeds this threshold, oxygen consumption and blood lactate levels rise continuously until reaching their maximum at the point of exhaustion. This research aimed to compare the effects of a 6-week High-Intensity Training (HIT) program based on the CP concept on blood lactate levels, peak power, and 40-kilometer cycling time-trial performance.
METHODS:
The sample consisted of 30 volunteers, divided into a control group (n=15) and an experimental group (n=15). Participants performed an Incremental Exercise Test and a 40-kilometer cycling test before and after the 6-week HIT program. Data including blood lactate levels, peak power, and 40-km cycling time were analyzed and compared within and between groups using Paired and Independent t-Tests.
RESULTS:
The results revealed that the experimental group’s average peak power (260±41.92 vs 282±40.04 watts) and maximum blood lactate levels (10.51±1.66 vs 11.34±1.07 mmol/L) increased significantly. Furthermore, performance during the 40-kilometer cycling test also showed a significant improvement (P < 0.05).
CONCLUSION:
Applying the Critical Power (CP) concept to a High-Intensity Training (HIT) program enhances maximum power output and improves the body's lactate accumulation tolerance. However, further studies are recommended to explore variations in training intensity and duration.