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 flutter kick is the most basic kicking technique used while swimming backstroke and freestyle. To flutter kick, swimmers alternate the movement of both legs rapidly. An efficient flutter kick helps swimmers go faster by generating forward thrust and maintaining proper body positioning in the water.