Table 1.

The keyword combinations used for the contextual searches in the international databases.

	PubMed	Elsevier	Cochrane	PEDro	Total
Intermittent hypoxia–hyperoxia	29	85	33	3	150
Intermittent hypoxia–hyperoxia training	5	110	21	3	139
Intermittent hypoxic training	34	487	107	6	634
Total	68	682	161	12	923