Changes in respiratory rate and volume cause rapid digital vasoconstriction, which is an important physiological consideration for vasomotor conditioning studies.
Respiratory confounds must be controlled in vasomotor assessments; leaves open clinical relevance in cardiovascular populations.
The effects of varied conditions of respiratory rate and volume upon finger pulse volume were investigated. Results indicated that any change in ongoing respiratory activity resulted in maximal digital vasoconstriction within 4–6 sec, and that these effects were greatest during deep breathing. The relevance of these findings for investigations of vasomotor conditioning are discussed.
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Shean et al. (1971) studied this question.
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