Table 1. Mean ± standard deviation (SD) and statistical results obtained in the present study.

Variables	Start segment	Turn segment	Correlation coefficient		T-test Difference	ANOVA
			Start (vs. T0-15)	Turn (vs. T25-35)		Main effect (Segments)	Main effect (Events)	Interaction
Lap time (s)	11.51 ± 0.43	13.71 ± 0.59	0.93†	0.90†	n.a.	n.a.
T0-15 and T25-35 (s)	6.24 ± 0.25	5.35 ± 0.25	n.a.	n.a.	n.a.	n.a.
UW-vxmean (m·s-1)	2.26 ± 0.11	1.98 ± 0.08	-0.70#	-0.95†	0.28 ± 0.92†	n.a.
UW Time (s)	3.23 ± 0.61	3.18 ± 0.81	-0.51	-0.41	0.46 ± 0.61	n.a.
UW Distance (m)	7.26 ± 1.42	6.29 ± 1.68	-0.64	-0.57	0.97 ± 1.12#	n.a.
Kick frequency (Hz)	2.52 ± 0.23	2.16 ± 0.19	-0.16	-0.46	0.36 ± 1.55†	n.a.
Kick count (times)	7.00 ± 1.56	5.71 ± 2.09	-0.70#	-0.55	1.29 ± 1.49#	n.a.
Deckick (m·s-2)	-0.51 ± 0.23	-0.36 ± 0.27	0.33	0.43	-0.16 ± 0.21*	n.a.
Glide time (s)	0.40 ± 0.13	0.59 ± 0.27	0.56	0.33	-0.20 ± 0.20#	n.a.
Initial-vxhead (m·s-1)	4.60 ± 0.33	3.04 ± 0.16	0.03	-0.48	n.a.	F = 476.71†  η2P = 0.97	F = 438.07†  η2P = 0.97	F = 137.95†  η2P = 0.91
First-vxhead (m·s-1)	2.70 ± 0.27	2.13 ± 0.21	-0.86†	-0.59	n.a.
Last-vxhead (m·s-1)	1.81 ± 0.15	1.70 ± 0.11	-0.55	-0.51	n.a.
Initial-vyhead (m·s-1)	-1.51 ± 0.52	-0.39 ± 0.22	0.57	0.66	n.a.	F = 121.08†  η2P = 0.90	F = 49.47†  η2P = 0.79	F = 70.67†  η2P = 0.85
First-vyhead (m·s-1)	0.11 ± 0.24	0.002 ± 0.16	0.69#	0.39	n.a.
Last-vyhead (m·s-1)	0.34 ± 0.10	0.25 ± 0.10	-0.50	-0.65	n.a.
Initial-BA (Ëš)	-14.63 ± 8.42	-6.93 ± 5.58	0.48	0.69#	n.a.	F = 60.26†  η2P = 0.82	F = 1.12 η2P = 0.08	F = 14.71†  η2P = 0.53
First-BA (Ëš)	7.57 ± 7.02	3.44 ± 6.78	0.70#	0.46	n.a.
Last-BA (Ëš)	12.62 ± 5.34	11.43 ± 6.09	-0.29	-0.15	n.a.

T_0-15, 0-15 m time; T_25-35, 25-35 m time; UW, underwater; vx_mean, forward velocity; Dec_kick, the mean deceleration from the first to the last kick; Initial-vx_head, the forward head velocity at the feet entry or push-off; First-vx_head, the mean forward velocity during the first kick; Last-vx_head, the mean forward velocity during the last kick; Initial-vy_head, the upward head velocity at the feet entry or push-off; First-vy_head, the mean upward velocity during the first kick; Last-vy_head, the mean upward velocity during the last kick; Initial-BA, the angle of the upper body at the feet entry or push-off; First-BA, the mean angle of the upper body during the first kick; Last-BA, the mean angle of the upper body during the last kick; η²_P, Partial eta squared.*, p < 0.05;#, p < 0.01;† , p < 0.001; n.a., not applicable