Table 2: Mean ± standard deviation and effect size (d) of stroke index (SI), stroke length (SL), stroke rate (SR) and rate of perceived exertion (RPE) of breaststroke, front crawl, head-up crawl, and back crawl in flat, medium and large waves.

		SI		d	SL (m)		d	SR (min-1)		d	RPE		d
Breast stroke	Flat	1.67	±0.44		1.50	±0.24		45	±6		11.7	±2.1
	Medium	1.67	±0.42	0	1.54	±0.25	.21	42	±7	.46	11.3	±2.3	.18
	Large	1.48	±0.37	.47	1.45	±0.24	.16	43	±7	.31	12.1	±2.8	.16
Front crawl	Flat	1.81	±0.62		1.20	±0.40		82	±22		12.2	±1.9
	Medium	1.81	±0.66	0	1.21	±0.43	.02	81	±23	.04	12.5	±2.5	.14
	Large	1.52	±0.44	.54	1.10	±0.32	.28	82	±21	0	13.1	±2.6	.40
Head-up crawl	Flat	1.26	±0.41		0.94	±0.31		94	±28		13.2	±3.2
	Medium	1.25	±0.38	.03	0.99	±0.37	.15	88	±29	.21	13.2	±3.3	0
	Large	1.03	±0.32	.63	0.87	±0.28	.24	90	±25	.15	13.6	±3.1	.13
Back crawl	Flat	1.55	±0.52		1.21	±0.39		69	±18		11.9	±2.4
	Medium	1.55	±0.46	0	1.25	±0.40	.10	65	±18	.22	11.4	±2.1	.22
	Large	1.42	±0.47	.26	1.19	±0.38	.05	66	±18	.17	12.4	±2.2	.22