The alactic anaerobic energy system described above is the first system recruited for muscle contraction and can last for only about 10 seconds of intense exercise after which the lactic anaerobic and aerobic energy systems become the main contributors to ATP production. (shapesense.com)
The enhancing effect of BioSteel HPSD may be attributed to a more efficient use of lactic anaerobic energy system (anaerobic glycolysis) allowing continuation of muscular power production for a maximum of 2 min. (biosteel.com)
The alactic anaerobic energy system provides its ATP energy through a combination of ATP already stored in the muscles (about 1 or 2 seconds worth from prior cellular respiration during rest) and its subsequent rephosphorylization (about 8 or 9 seconds worth) after use by another molecule called phosphocreatine (PCr). (shapesense.com)