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.
The fastest stroke is the crawl (or better known as the freestyle: Actually freestyle is a term used to allow the swimmer to choose whatever stroke they wish. According to the record books butterfly is usually second fastest, then backstroke (although these are very close), and then breaststroke.