Article: Liftestyle: Early morning exercise . . . not such a good idea after all?; The researchers from Brunel University's Department of Sport Sciences conclude that the body clock has a considerable impact on the immune system. The study concludes that the best time to train is in the evening when cortisol levels are lower and salivary flow rate peaks.(Female Times)

Byline: JULIE WHELDON

Early morning exercise may increase your likelihood of picking up an infection, according to a new study published today.

Research involving competitive swimmers found that levels of cortisol - a hormone which suppresses the immune system - were higher in the morning compared to the evening before exercise and significantly higher after exercise.

The flow rate of saliva, which helps protect against bugs and viruses, was reduced by swimming and in the mornings was lower before exercise.

The study also looked at IgA, ...

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