Table 1.

Values of Heart rate (HR), directly measured oxygen consumption and energy expenditure (VO₂; EE).

	Speed (km/h)	#	HR(b/min)	VO2 (ml·kg-1·min-1)	EE(kcal·kg-1·min-1)
	0.0	15	81±12	8.1±1.6	0.03±0.01
	8.0	15	123±21	26.9±4.8	0.12±0.03
	8.5	15	144±14	32.0±3.2	0.15±0.02
	9.0	15	150±13	34.4±2.5	0.17±0.02
	9.5	15	157±14	36.2±2.3	0.18±0.02
	10.0	15	161±12	37.5±2.6	0.18±0.02
	10.5	15	165±12	39.3±1.9	0.19±0.02
	11.0	15	171±12	41.1±2.1	0.20±0.02
	11.5	15	172±11	41.5±2.7	0.20±0.02
	12.0	15	175±10	43.0±2.5	0.21±0.02
	12.5	12	177±9	44.9±2.9	0.22±0.03
	13.0	11	180±9	44.9±3.0	0.22±0.03
	13.5	10	180±11	46.3±2.9	0.23±0.03
	14.0	10	183±11	46.9±2.8	0.24±0.03
	14.5	8	186±11	47.4±3.8	0.24±0.03
	15.0	5	184±13	48.3±5.7	0.25±0.05
	15.5	4	182±9	51.4±4.0	0.25±0.05
	16.0	1	192	53.3	0.23
Max	14±1.4	15	186±9	47.1±4.3	0.23±0.03

Data are presented for each speed of the incremental test (Speed) along with the number of players that completed the step (#). Speed “0” refers to the minute of baseline in a standing position (resting HR for HR_index calculation was recorded at a different time).