Table 4. Time spent in Heart Rate zones in each experimental condition. Data are means (±SD).

	<50% HRrel (% drill time)	50%-70% HRrel (% drill time)	70%-90% HRrel (% drill time)	>90% HRrel (% drill time)
24x12m	.6 (.9)	5.0 (4.4)	40.8 (27.4)	53.7 (31.6)
30x15m	2.7 (1.1)	9.5 (9.8)	65.1 (23.3)	22.7 (27.7)
32x16m	.6 (1.1)	3.4 (1.6)	47.1 (37.8)	48.9 (39.3)