Measurement accuracy of heart rate and respiratory rate during graded exercise and sustained exercise in the heat using the Zephyr BioHarness(TM).
Kim-J-H; Roberge-R; Powell-JB; Shafer-AB; Williams-WJ
Int J Sports Med 2013 Jun; 34(6):497-501
The Zephyr BioHarness(TM) was tested to determine the accuracy of heart rate (HR) and respiratory rate (RR) measurements during 2 exercise protocols in conjunction with either a laboratory metabolic cart (Vmax) or a previously validated portable metabolic system (K4b 2 ). In one protocol, HR and RR were measured using the BioHarness and Vmax during a graded exercise up to V . O 2max (n = 12). In another protocol, HR and RR were measured using the BH and K4b 2 during sustained exercise (30 % and 50 % V . O 2max for 20 min each) in a hot environment (30 °C, 50 % relative humidity) (n = 6). During the graded exercise, HR but not RR, obtained from the BioHarness was higher compared to the Vmax at baseline and 30 % V . O 2max (p < 0.05), but showed no significant difference at other stages with high correlation coefficients for both HR (r = 0.87-0.96) and RR (r = 0.90-0.99 above 30 % V . O 2max ). During the exercise in the heat, there were no significant differences between the BioHarness and K4b 2 system. Correlation coefficients between the methods were low for HR but moderately to highly correlated (0.49-0.99) for RR. In conclusion, the BioHarness is comparable to Vmax and K4b 2 over a wide range of V . O 2 during graded exercise and sustained exercise in the heat.
Laboratory-testing; Testing-equipment; Heat; Heat-production; Heart-rate; Respiration; Breathing; Physical-exercise; Metabolic-rate; Metabolic-study; Body-temperature; Analytical-instruments; Equipment-reliability; Hot-environments; Psychological-responses; Psychological-testing; Monitoring-systems;
Author Keywords: physiological monitoring; portable metabolic system; reliability
Dr. W. Jon Williams, NIOSH/CDC Technology Research Branch, 626 Cochrans Mill Road 15236 Pittsburgh, PA 15236 USA
International Journal of Sports Medicine