. Author manuscript; available in PMC: 2012 Nov 1.

Published in final edited form as: Magn Reson Imaging. 2011 Sep 9;29(9):1186–1194. doi: 10.1016/j.mri.2011.07.011

Table 2. Measured respiratory parameters during each of the breathing conditions in Table 1.

All values are average ± standard deviation across subjects. Respiration amplitude ratio is calculated relative to the FREE1 condition; RVT = respiration volume per time; ETCO2 = end-tidal carbon dioxide.

Condition	Respiration Amplitude Ratio	Respiratory Rate (min⁻¹)	RVT (arb. units)	ETCO₂ (mmHg)
FREE1	1.00 ±0	15.5 ± 3.35	2.5 ± 0.68	37.4 ± 2.78
NORMAL1	1.11 ± 0.27	15.4 ± 0.85	2.8 ± 0.75	35.9 ± 3.40
RAPID1	1.07 ± 0.31	22.0 ± 0.30	3.9 ± 1.19	31.9 ± 2.42
DEEP1	1.50 ± 0.59	13.7 ± 2.78	3.0 ± 0.66	29.8 ± 2.46
RAPID&DEEP	1.24 ± 0.57	25.5 ± 3.71	4.8 ± 2.11	23.9 ± 2.07
DEEP2	1.59 ± 0.61	13.8 ± 1.05	3.2 ± 0.78	26.7 ± 2.78
RAPID2	1.11 ± 0.38	22.2 ± 0.34	3.9 ± 1.39	25.8 ± 2.63
NORMAL2	1.11 ± 0.26	15.6 ± 0.61	2.7 ± 0.87	28.5 ± 3.16
FREE2	0.88 ± 0.25	14.1 ± 2.55	2.0 ± 0.77	32.0 ± 3.59