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Table 1 Outcome variables (scaled and absolute values)

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

f R MVV VT PETCO2
(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/ab n/ab n/ab
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
Maximuma 157.7 ± 52.5 2.4 ± 0.9 17.1 ± 2.5
  1. 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
  2. All values are reported as the percent of the maximum value obtained using preselected fR values
  3. Abbreviations: f R breathing frequency, MVV maximum voluntary ventilation, V T tidal volume, PETCO 2 partial pressure of end-tidal CO2
  4. *P < 0.05 when compared to self-selected fR
  5. P < 0.05 when compared to maximum
  6. aHighest value obtained across all fR values for every participant
  7. bValues were missing from data collection