https://www.selleckchem.com/pr....oducts/leupeptin-hem
05. An increase in HR and Bla- was observed from interval working periods 1 to 3 (90-92% of HRmax and 6.5-7.7 mmol · L-1) and further from 3 to 5 (92-93% of HRmax and 7.7-9.0 mmol · L-1), all P less then 0.05. Conclusions We describe long-term use of HIT-block periodization among world-class XC skiers who achieved target HR and Bla- levels in all six exercise modes employed. According to athletes and coaches, the key to successful blocks was intensity control to allow for high-quality HIT sessions throughout the entire HIT