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.
You will commonly hear the front crawl referred to as the freestyle stroke, since the majority of the swimmers in a freestyle event use it because it provides the most speed. The front crawl calls for you to kick hard with your feet, while bringing your arms over your head and into the water one at a time.