Table 1.

Training variables before (Phase 1) and during (Phase 2A and 2B) intervention. Total swimming distance (TS), high-intensity swimming distance (HIS), and training hours out of the water (OUT) are presented as mean and standard deviation

	TS km/wk	HIS km/wk	HIS to TS (%)	OUT h/wk
Phase 1	45.9 ± 14.4	4.8 ± 2.8	10.4 ± 10.0	2.5 ± 0.7
Phase 2A	31.3 ± 5.5	7.2 ± 3.9	20.7 ± 6.9	2.6 ± 0.9
Phase 2B	22.1 ± 3.9	3.2 ± 1.3	14.3 ± 13.2	1.8 ± 0.4

Phase 1 (from March 18 to May 3, 2019), experimental Phase 2A (from May 6 to June 7, 2019), and experimental Phase 2B (from June 8 to June 15, 2019) which towards to Slovak Swimming National Championship in Long course (15–16th June 2019, Žilina, Slovakia). All measurements were taken before Phase 2A and repeated after Phase 2B (in the week following the championship)