Mental fatigue may impair exercise performance

February 26, 2009 1:36:15 PM PST
A new finding may help explain why it is sometimes so difficult to work out. British researchers say being mentally exhausted can impair a person's exercise performance.

In the study, participants who performed a mentally tiresome test just before exercising reached exhaustion much more quickly than when they were mentally rested.

The doctors found that mental fatigue did not affect the performance of the heart or muscles, but it did affect their perceived effort.

The study is in the Journal of Applied Physiology.