Effect of altering breathing frequency on maximum voluntary ventilation in healthy adults

BMC Pulmonary Medicine

Table 1 Outcome variables (scaled and absolute values)

f _R	MVV		V_T		P_ETCO₂
(breaths·min^− 1)	(%)	(L·min^− 1)	(%)	(L)	(mmHg)
50	76.2 ± 9.9^*†	125.1 ± 45.3	99.1 ± 1.6	2.4 ± 0.9	15.3 ± 2.0
60	81.7 ± 13.9^†	131.4 ± 52.0	88.4 ± 9.0^†	2.2 ± 0.8	15.0 ± 3.3
70	84.3 ± 11.9^†	134.1 ± 47.2	78.5 ± 5.4^†	1.9 ± 0.7	14.5 ± 2.9
80	87.5 ± 8.3^†	139.4 ± 50.2	72.1 ± 12.3^*†	1.7 ± 0.6	14.2 ± 2.7
90	91.4 ± 5.9^†	144.1 ± 49.6	67.7 ± 11.5^*†	1.6 ± 0.5	13.3 ± 2.1
100	93.3 ± 3.7^†	147.6 ± 51.5	62.0 ± 10.4^*†	1.5 ± 0.5^†	14.2 ± 2.7
110	92.2 ± 9.5^†	144.9 ± 48.4	51.9 ± 19.9^*†	1.3 ± 0.6	13.6 ± 2.2
120	90.2 ± 10.2^†	144.7 ± 58.3	50.5 ± 10.3^*†	1.2 ± 0.5	13.0 ± 2.4
130	81.0 ± 11.4^†	129.6 ± 52.1	n/a^b	n/a^b	n/a^b
Self-Selected (69.9 ± 22.3)	91.1 ± 16.5	144.8 ± 59.4	90.9 ± 19.1	2.1 ± 0.7	13.7 ± 2.0
Maximum^a	–	157.7 ± 52.5	–	2.4 ± 0.9	17.1 ± 2.5

Values are presented as mean ± SD both 1) scaled as a percentage of the maximum and 2) absolute. Statistical analysis was performed only on scaled values
All values are reported as the percent of the maximum value obtained using preselected f_R values
Abbreviations: f_R breathing frequency, MVV maximum voluntary ventilation, V_T tidal volume, PETCO₂ partial pressure of end-tidal CO2
*P < 0.05 when compared to self-selected f_R
†P < 0.05 when compared to maximum
^aHighest value obtained across all f_R values for every participant
^bValues were missing from data collection

ISSN: 1471-2466