Table 2.

Physiological responses from the graded exercise test using two “simultaneous” systems (1 and 2: mean ± SD), and p value from paired t tests, absolute percentage error (APE), coefficient of variation (CV), and effect size

Variable	System 1	System 2	Paired t p value	APE mean (range)	CV mean (range)	Effect size
V E (L min−1)
Rest	12.26 ± 3.26	12.21 ± 3.30	0.555	2.6 (0.1–9.2)	1.8 (0.0–6.2)	0.02
30 W	19.70 ± 2.49	19.63 ± 1.94	0.752	2.6 (0.1–10.8)	1.9 (0.1–7.3)	0.03
60 W	27.16 ± 2.75	27.15 ± 2.38	0.991	2.1 (0.2–6.4)	1.5 (0.2–4.4)	0.00
90 W	37.13 ± 5.08	37.19 ± 4.93	0.750	1.7 (0.1–4.1)	1.2 (0.1–2.8)	0.01
120 W	47.86 ± 6.09	48.27 ± 5.73	0.173	1.8 (0.1–6.1)	1.2 (0.1–4.2)	0.07
VO2 (L min−1)
Rest	0.32 ± 0.05	0.31 ± 0.04	0.102	2.9 (0.9–7.0)	2.0 (0.6–4.8)	0.10
30 W	0.73 ± 0.08	0.73 ± 0.07	0.420	2.6 (0.1–9.2)	1.8 (0.1–6.8)	0.09
60 W	1.05 ± 0.09	1.04 ± 0.08	0.423	1.9 (0.1–7.2)	1.4 (0.1–5.3)	0.08
90 W	1.42 ± 0.08	1.41 ± 0.07	0.327	1.6 (0.1–5.2)	1.1 (0.1–3.8)	0.10
120 W	1.78 ± 0.13	1.78 ± 0.12	0.823	1.6 (0.1–4.5)	1.1 (0.0–3.3)	0.02
VCO2 (L min−1)
Rest	0.29 ± 0.06	0.29 ± 0.06	0.702	2.4 (0.3–9.2)	1.7 (0.2–6.2)	0.02
30 W	0.64 ± 0.07	0.64 ± 0.06	0.885	2.6 (0.3–10.7)	1.8 (0.2–7.2)	0.01
60 W	0.95 ± 0.07	0.95 ± 0.07	0.856	2.1 (0.2–6.1)	1.5 (0.1–4.5)	0.02
90 W	1.37 ± 0.11	1.37 ± 0.12	0.698	1.7 (0.0–3.9)	1.2 (0.0–2.7)	0.03
120 W	1.75 ± 0.16	1.77 ± 0.15	0.163	1.7 (0.0–5.9)	1.2 (0.0–4.0)	0.10
F EO2 (%)
Rest	17.73 ± 0.57	17.75 ± 0.57	0.008	0.1 (0.0–0.4)	0.1 (0.0–0.3)	0.03
30 W	16.46 ± 0.41	16.48 ± 0.41	0.007	0.2 (0.0–0.6)	0.1 (0.0–0.4)	0.06
60 W	16.27 ± 0.35	16.29 ± 0.34	0.012	0.2 (0.0–0.6)	0.1 (0.0–0.4)	0.07
90 W	16.22 ± 0.45	16.25 ± 0.44	0.006	0.2 (0.0–0.6)	0.1 (0.0–0.4)	0.06
120 W	16.34 ± 0.42	16.37 ± 0.41	0.003	0.2 (0.0–0.6)	0.1 (0.0–0.4)	0.07
F ECO2 (%)
Rest	2.99 ± 0.39	3.00 ± 0.39	0.081	0.3 (0.0–1)	0.2 (0.0–0.7)	0.01
30 W	4.05 ± 0.37	4.05 ± 0.37	0.497	0.2 (0.0–0.8)	0.2 (0.0–0.6)	0.01
60 W	4.37 ± 0.37	4.37 ± 0.37	0.491	0.3 (0.0–1.0)	0.2 (0.0–0.7)	0.01
90 W	4.60 ± 0.37	4.60 ± 0.37	0.863	0.3 (0.0–0.7)	0.2 (0.0–0.5)	<0.01
120 W	4.56 ± 0.36	4.56 ± 0.36	0.792	0.3 (0.0–0.8)	0.2 (0.0–0.5)	<0.01
RER
Rest	0.92 ± 0.12	0.93 ± 0.13	0.010	1.1 (0.1–4.1)	0.8 (0.1–2.8)	0.09
30 W	0.87 ± 0.05	0.88 ± 0.05	0.002	0.8 (0.2–2.1)	0.6 (0.1–1.5)	0.14
60 W	0.91 ± 0.04	0.92 ± 0.04	0.002	0.8 (0.1–2.0)	0.6 (0.1–1.4)	0.15
90 W	0.96 ± 0.06	0.97 ± 0.06	0.003	0.9 (0.2–1.9)	0.6 (0.1–1.3)	0.12
120 W	0.98 ± 0.04	0.99 ± 0.05	0.002*	0.8 (0.0–1.8)	0.6 (0.0–1.3)	0.16

* Significantly different means by paired t test with Holm’s sequential Bonferroni adjustment