Association between oxygen consumption and nitric oxide production during the relaxation response
- PMID: 16369463
Association between oxygen consumption and nitric oxide production during the relaxation response
Abstract
Background: Mind/body practices that elicit the relaxation response (RR) are currently practiced by over 30% of American adults. RR elicitation reduces volumetric oxygen consumption (VO(2)) from rest and counteracts the effects of stress, although the mechanisms mediating the RR remain unknown. This study was designed to investigate whether RR elicitation is mediated by nitric oxide (NO). We developed a method to quantify depth of RR using change in VO(2) (slope) during RR elicitation. We evaluated whether depth of RR elicitation was correlated with changes in NO, as measured by percentage changes in fractional exhaled nitric oxide (F(E)NO).
Material/methods: We conducted a randomized, controlled trial, in which 46 subjects were randomized to either 8-weeks of RR training using audiotapes (n=34) or 8-weeks of exposure to a control condition--receiving health-education by audiotapes (n=12). Prior to randomization, VO(2) and F(E)NO were measured while subjects listened to a control audiotape. Eight weeks later, VO(2) and F(E)NO were measured while the RR group listened to a RR-eliciting audiotape and the control group listened to a control audiotape.
Results: Prior to receiving any training, there was no association between VO(2) slope and F(E)NO. After training, there was an inverse correlation between VO(2) slope and F(E)NO in the RR group (r = -0.41, P=0.037, n=26), but not in the control group (r=0.12, P=0.78, n=8).
Conclusions: Depth of RR elicitation was associated with increased concentrations of F(E)NO after RR training. The RR may be mediated by NO helping to explain its clinical effects in stress-related disorders.
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