Effect of oral rehydration solution on fatigue during outdoor work in a hot environment: a randomized crossover study.

Objectives: The effects of an oral rehydration solution (ORS) on fatigue were studied in workers engaged in manual work during the summer.

Methods: One hundred and fifty-three workers engaged in loading cargo onto aircraft at Tokyo International Airport who consented to participate in the study were the subjects. The study was carried out on two summer days with fine weather during the daytime shift.