Hearth and campfire influences on arterial blood pressure: defraying the costs of the social brain through fireside relaxation.

In the control condition, a systolic decrease was borderline significant ( M ± SD = 2.10 ± 8.50), t (62) = 1.96, p = .06, and diastolic pressure increased slightly from pre- to posttest ( M ± SD = −0.89 ± 7.69), t (62) = −0.92, p = .36.

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I found a reduction from pre- to posttest in the fire-with-sound condition that approached significance, but only with regard to systolic blood pressure; it is possible this effect was due to the relatively elevated blood pressure in the fire-with-sound pretest.

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