Table 2. Time‐course changes in respiratory variables
Time into exercise (min)
BL510152025303540
Minute ventilation, L min−1
Control10.0 ± 1.645.4 ± 5.354.4 ± 5.556.5 ± 5.159.0 ± 5.061.0 ± 5.662.6 ± 6.664.5 ± 6.765.3 ± 4.6
Graduated compression9.7 ± 0.846.2 ± 2.754.3 ± 2.955.4 ± 3.756.7 ± 4.958.5 ± 4.559.2 ± 4.361.1 ± 4.661.6 ± 4.9
Tidal volume, L
Control0.6 ± 0.11.5 ± 0.21.6 ± 0.21.6 ± 0.21.6 ± 0.31.6 ± 0.31.6 ± 0.31.6 ± 0.31.5 ± 0.3
Graduated compression0.6 ± 0.11.6 ± 0.21.7 ± 0.21.6 ± 0.21.6 ± 0.21.6 ± 0.31.6 ± 0.31.6 ± 0.41.5 ± 0.4
Respiratory frequency, breaths min−1
Control17 ± 331 ± 534 ± 636 ± 638 ± 940 ± 1042 ± 1043 ± 1046 ± 10
Graduated compression16 ± 230 ± 533 ± 635 ± 637 ± 838 ± 839 ± 841 ± 1042 ± 10
Estimated arterial CO2 pressure, mmHg
Control40.1 ± 2.243.5 ± 2.542.4 ± 2.841.9 ± 2.741.1 ± 2.640.3 ± 2.340.0 ± 2.539.3 ± 2.538.9 ± 1.6
Graduated compression42.1 ± 1.4a44.3 ± 2.143.1 ± 2.142.4 ± 1.841.9 ± 1.641.4 ± 1.441.0 ± 1.340.6 ± 1.5a40.4 ± 1.4a
O2 uptake, L min−1
Control0.27 ± 0.031.78 ± 0.242.02 ± 0.202.07 ± 0.192.11 ± 0.202.13 ± 0.202.16 ± 0.212.17 ± 0.202.18 ± 0.19
Graduated compression0.27 ± 0.021.84 ± 0.172.06 ± 0.182.06 ± 0.182.06 ± 0.182.11 ± 0.182.11 ± 0.172.15 ± 0.162.14 ± 0.15
CO2 output, L min−1
Control0.24 ± 0.031.65 ± 0.211.93 ± 0.171.96 ± 0.182.00 ± 0.182.00 ± 0.172.02 ± 0.202.04 ± 0.202.01 ± 0.13
Graduated compression0.24 ± 0.021.73 ± 0.141.98 ± 0.181.95 ± 0.181.95 ± 0.181.99 ± 0.181.98 ± 0.172.00 ± 0.161.98 ± 0.15
Respiratory exchange ratio
Control0.88 ± 0.060.93 ± 0.050.96 ± 0.030.95 ± 0.030.95 ± 0.030.94 ± 0.030.94 ± 0.030.94 ± 0.040.92 ± 0.04
Graduated compression0.88 ± 0.020.94 ± 0.050.96 ± 0.030.95 ± 0.020.94 ± 0.020.94 ± 0.020.94 ± 0.020.93 ± 0.030.93 ± 0.03
  • Data are mean ± standard deviation (= 9). BL, baseline at rest.

  • a vs. Control (P ≤ 0.05).