does your heart rate go up when you hold your breath?
During the first breath-holding, HR (15 s) increased up to 107.6 ± 4.2 bpm (P<0.05) compared with the baseline (89.5 ± 3.9 bpm). This was followed by a decrease in HR, which decreased to 80.2 ± 6.9 bpm after 60 s.