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The Zephyr™ BioHarness™ (Zephyr Technology, Auckland, New Zealand) is a wireless physiological monitoring system that has the ability to measure respiratory rate unobtrusively. However, the ability of the BioHarness™ to accurately and reproducibly determine respiratory rate across a range of intensities is currently unknown. The aim of this study was to determine the reliability and validity of the BioHarness™ to measure respiratory rate. Twelve physically active participants attended the laboratory on two separate occasions to perform an incremental treadmill test to volitional exhaustion. Respiratory rate (br.min−1) was measured continuously and simultaneously during both trials using both a Metamax 3b online gas-analysis system (Cortex, Leipzig, Germany) and the BioHarness™. The mean respiratory rate measured by the Metamax 3b and BioHarness™ did not differ statistically (p .05). The BioHarness™ is a valid and reliable device for determining respiratory rate and the respiratory breakpoint during exercise of varying intensity.
Hailstone et al. (Sat,) studied this question.