Measurements of their heart rate and the stress hormone, cortisol, before and after the speech found that people calmed down faster when they listened to nature recordings than when the same audio tracks were interspersed with sounds from road traf c, aeroplanes and even normal conversation.

Measurements of their heart rate and the stress hormone, cortisol, before and after the speech found that people calmed down faster when they listened to nature recordings than when the same soundtracks also contained noises from road traf c, aeroplanes and even normal conversation.
