Table 3

Linear prediction equations for pattern and timing of breathing at different levels of ventilatory stress according to age, anthropometric attributes and sex

Age yrsWeight kgHeight cmSex#ConstantR295% CI
VT/IC
 20 L·min−10.00107±0.001−0.00312±0.0010.55±0.060.1750.17
 40 L·min−10.00147±0.001−0.00382±0.0010.78±0.070.1770.21
 60 L·min−10.00124±0.001−0.00297±0.0010.83±0.080.1150.24
fR breaths·min−1
 20 L·min−1−0.177±0.073−2.364±1.23652±100.1838
 40 L·min−1−0.233±0.069−4.074±1.16667±90.3588
 60 L·min−1−0.252±0.082−6.071±1.33277±120.4208
fR/VT breaths·min−1·L−1
 20 L·min−1−0.362±0.140−4.359±2.37684.9±22.10.18919.7
 40 L·min−1−0.376±0.093−4.782±1.56082.4±14.60.35812.9
 60 L·min−1−0.326±0.094−6.452±1.53075.6±14.90.42112.4
TI s
 20 L·min−10.33±0.081.19±0.060.1170.42
 40 L·min−10.28±0.040.96±0.030.2510.26
 60 L·min−10.25±0.040.77±0.020.2830.20
TE s
 20 L·min−10.32±0.081.46±0.060.1190.45
 40 L·min−10.32±0.051.12±0.040.2410.28
 60 L·min−10.28±0.040.89±0.030.2910.21
  • Data are presented as mean±sem

  • CI: two-sided confidence limits

  • VT: tidal volume

  • IC: inspiratory capacity

  • fR: respiratory frequency

  • TI: inspiratory time

  • TE: expiratory time

  • #: males 1, females 0