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Table 1 Cardiorespiratory variables during the 5-min exercise

From: Does voluntary hypoventilation during exercise impact EMG activity?

Variables Conditions 1 min 2 min 3 min 4 min 5 min
\({\dot{\text{V}}}\)E (L/min) NB 50.34 ± 3.60 61.60 ± 4.63 69.52 ± 5.30 69.52 ± 5.30 68.46 ± 3.97
VH 36.14 ± 4.78* 45.27 ± 2.03* 50.58 ± 4.87* 52.52 ± 4.77* 53.60 ± 5.11*
\({\dot{\text{V}}}\)O2 (L/min) NB 1.93 ± 0.12 2.22 ± 0.11 2.38 ± 0.07 2.41 ± 0.06 2.46 ± 0.05
VH 1.66 ± 0.14 2.03 ± 0.14 2.20 ± 0.14 2.23 ± 0.23 2.34 ± 0.15
\({\dot{\text{V}}}\)CO2 (L/min) NB 1.55 ± 0.10 1.88 ± 0.13 2.05 ± 0.14 2.12 ± 0.15 2.08 ± 0.10
VH 1.24 ± 0.11* 1.69 ± 0.09* 1.83 ± 0.20 1.90 ± 0.20 2.00 ± 0.14
RER NB 0.81 ± 0.04 0.85 ± 0.04 0.86 ± 0.05 0.88 ± 0.07 0.85 ± 0.04
VH 0.75 ± 0.02 0.80 ± 0.03 0.83 ± 0.04 0.85 ± 0.03 0.85 ± 0.02
HR (beats/min) NB 127 ± 7 136 ± 6 142 ± 8 145 ± 7 147 ± 9
VH 128 ± 6 136 ± 7 142 ± 7 147 ± 7 150 ± 7
SaO2 (%) NB 98.4 ± 0.7 98.0 ± 0.9 97.5 ± 0.7 97.5 ± 0.5 97.4 ± 0.7
VH 97.2 ± 1.5* 93.2 ± 3.4* 92.3 ± 2.5* 91.2 ± 2.1* 89.6 ± 3.2*
  1. Values are mean ± SD. * P < 0.05 vs. NB condition