Background: In our study, we compared the activity of the seven selected reflective of the lower limb muscles in terms of overall activation level preaktivace and kokontrakce pairs of antagonists. File: Measurements were 14 actively participating athletes - men ( age 22.6 +- 4.4 years , height 182.4 +- 5.3 cm, weight 74.7 +- 6.2 kg) who underwent long-term sports training desetibojařskou lessons given and whose personal record in the decathlon exceeded 6000 points.