Paris - Bosses who are disliked for being unfair or unreasonable can stoke a massive rise in workers' blood pressure, a phenomenon that fuels the risk of a heart attack or stroke, a study revealed on Monday.
Scientists recruited 28 female nursing assistants in British hospitals and monitored their blood pressure every 30 minutes to see how it changed in the presence of their supervisor.
Thirteen of the 28 had two supervisors, who alternated during their working week - one workers liked, and the other they disliked.
The 15 others were a comparison group: they either had just one supervisor or two, both of whom were liked or disliked.
Those who had to alternate with Ms Nice and Ms Nasty had an astonishing difference in blood pressure, the researchers found.