A New Utility Of Breath-holding Maneuver To Determine Resting Heart Rate

The aim of this study was to use breath-holding maneuver to predict RHR with and without controlled breathing. Eighteen healthy subjects (nine male) 27.6 + or - 5.0 year; 24.2 + or - 2.9 kg.m super(-2); 43.3 + or - 7.5 mL.kg super(-1).min super(-1) (estimated) performed the breath-holding maneuver twice. The duration of maneuver was 10 s with a 1 min recovery between trials. After that, the subjects have been laying rest under two experimental situations: a) with respiratory controlled of 7.5 breaths.minute-1 and b) without respiratory controlled. In both conditions, heart rate (HR) subjects were continuously monitored in milliseconds (POLAR RS800, USA). The subject's HR after breath-holding maneuver (57 + or - 9 bpm) and rest laying with (54 + or - 8 bpm) and without (56 + or - 8 bpm) respiratory controlled has not been significant different (p < 0.05). The Bland-Altman plot showed a 95% limit of agreement between -9.12 to 4.12 bpm and -8.89 to 8.89 when laying with and without respiratory controlled, respectively.