Table 12.

Example of data taken at an isotime of 5 min during an isotime quality control protocol; this is averaged over the last 10 tests and shows the type of variability that can be expected

Parameter	Units	Mean	Variance (%)
Power	W	190	0.5
HR	beats/min	117	3.1
VO2	mL/min	2608	4.1
VCO2	mL/min	2091	3.7
SPO2	%	99	1.0
RPM	revs/min	79	2.0
BF	breaths/min	27	14.1
VE	L/min	63	5.3
VTEX	L	2	11.0
PETCO2	kPa	5	3.5
PETO2	kPa	14	2.1
TI/TTOT		44	2.9
VE/VO2		23	6.5
VE/VCO2		29	4.8
BPSYS	mm Hg	150	13.1
BPDIA	mm Hg	69	11.9
ΔHR/ΔVO2	beats/mL	23	10.3
ΔVE/ΔVCO2		27	7.1
ΔVO2/ΔWR	mL/min/W	10	5.7
ΔVO2/ΔLOG10VE		4902	10.0

Source: P. Jamieson Respiratory Laboratory, Hairmyres Hospital, NHS Lanarkshire, UK.