Table 1.

Individual and mean (SD) baseline reference values of SpO₂ and HR during a period of immersed rest before dives, followed by depths, durations, and nadir SpO₂ (%) and HR (bpm) values during deep and shallow dives; time when nadir occurs is noted as seconds from start of the dive, as well as the maximal reduction from pre-dive SpO₂/HR reference values (%).

					Shallow
Diver	Pre SpO2	Depth	Duration	SpO2 nadir	SpO2 nadir (s)	SpO2 red (%)	HR nadir	HR nadir (s)	HR red (%)
1	99.6	19	97	97	116	3	28	33	67
2	97.3	15	32	89	41	8	46	29	23
3	99.2	23	80	48	89	52	59	49	37
4	98.3	20	117	85	136	13	36	97	55
Mean	98.6	19.1	81.5	80.0	95.5	18.9	42.1	52.0	45.6
SD	1.0	3.1	36.3	21.9	41.1	22.3	13.4	31.2	19.1
	p =	0.003	0.117	0.040	0.144	0.041	0.978	0.635	0.987
Diver	Pre HR				Deep
1	84.0	72	149	68	157	32	34	31	59
2	60.0	82	183	54	178	45	38	122	37
3	93.9	82	148	44	144	55	48	61	49
4	78.8	57	118	54	133	45	49	54	38
Mean	79.2	73.3	149.5	55.0	153.0	44.3	42.3	67.0	45.7
SD	1.0	11.8	26.6	9.7	19.3	9.6	7.2	38.8	10.6

p-values are shown for comparisons between deep and shallow dives.