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.
Breaststroke is the slowest of the four official styles in competitive swimming. The fastest breaststrokers can swim about 1.70 metres per second. It is sometimes the hardest to teach to rising swimmers after butterfly due to the importance of timing and the coordination required to move the legs properly.