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.
1 It's a good one to include in a mix of swim strokes, especially if you're aiming for distance in your swims. 2  Other stroke styles: Butterfly is another possibility, as is dog paddle. 3  The former is hard to learn and to physically exhausting to maintain, while the latter is so simple it can soon bore you.