All about base excess â to BE or not to BE. In 1948, Singer and Hastings introduced the concept of buffer base (BB). The change in BB from normal was called deltaBB (Î´BB). This change in BB was an expression of the non-respiratory (metabolic) component of an acid-base disturbance.
Empirically from http://www.usaswimming.org/_Rain..., free style is the fastest stroke. This is also called the front crawl (see Front crawl). However as Swimming stroke notes, there are at least 6 variations of that technique.
Swimming the backstroke is a popular form of swimming exercises that involves using the upper and lower body in synchronized movements in order to move forward. Swimming the backstroke is one of the four swim styles regulated by FINA, and may require a high level of endurance and athletic ability at a high speed.