Ergogenic aids: an update on ephedra.

Ephedra has been used medicinally for thousands of years dating back to ancient Chinese medicine. Since its introduction to Western medicine in the 20th century, ephedra has been used for various ailments. The amphetamine-like activity of ephedra made it a popular supplement for promotion of weight loss and enhancement of athletic performance, despite limited supporting data.

The ergogenics of fluid and electrolyte balance.

Fluid and electrolyte balance within a fairly narrow range is a requirement for human life. Athletes, particularly endurance athletes, routinely stress their bodies to the point of altering fluid and electrolyte levels. In some cases, significant fluctuations can lead to deterioration in performance and even the athlete's health.