Table 4.

Myocardial blood flow (MBF) as evaluated with ¹⁵O-H₂O-PET/CT at rest, during apnea of 378 ± 77 s and at recovery in 6 elite breath-hold divers.

	Rest (n = 5)	2 min apnea (n = 3)	4 min apnea (n = 3)	Recovery (n = 5)	P-value *
MBF (ml/g/min)	0.97 ± 0.15	0.82 ± 0.24	2.15 ± 0.39	1.02 ± 0.20	0.002
PTF	0.67 ± 0.09	0.71 ± 0.09	0.58 ± 0.10	0.68 ± 0.09	0.03
MBF × PTF (ml/g/min)	0.65 ± 0.17	0.58 ± 0.13	1.24 ± 0.23	0.70 ± 0.18	0.001

Values are means ± Standard deviations. *Mixed model repeated measures ANOVA. Rest compared to apnea.

MBF myocardial blood flow, PTF perfusable tissue fraction.