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A friend of mine, Alessandro Ferretti, studies HRV and religiously tracks his rate with medical-grade equipment. When he watched Masterchef Australia, with its genial and encouraging hosts, he found it relaxing and enjoyable and his HRV reflected this. But when he watched Masterchef USA, with Gordon Ramsay effing and blinding, he found it so irritating his HRV went down!
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Rangan Chatterjee (The Stress Solution: The 4 Steps to a Calmer, Happier, Healthier You)