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Table 1.

The effects in tambaqui Colossoma macropomum of internal injections of CO2-enriched saline or saline alone on selected cardiorespiratory variables

Saline (N=7)
5% CO2 (N=6)
10% CO2 (N=6)
PrePeakPPrePeakPPrePeakP
Pda (cmH2O) 35.5±1.6 38.7±1.7 0.021 35.6±1.4 39.4±1.6 0.09 35.5±1.4 38.1±1.6 0.32 
b (ml min−1kg−120.4±2.0 26.9±2.8 <0.001 23.9±2.9 28.4±3.2 0.015 24.1±2.5 30.1±3.6 0.016 
Rs (cm H2O min kg ml−11.82±0.13 1.87±0.16 0.012 1.61±0.20 1.77±0.19 0.013 1.50±0.13 1.59±0.15 0.008 
fh (min−134.5±3.9 26.9±2.8 0.003 33.1±4.7 25.9±3.2 0.74 32.0±4.1 27.9±3.6 0.67 
VAMP (cm) 0.30±0.06 0.40±0.07 0.008 0.35±0.08 0.41±0.08 0.11 0.34±0.08 0.39±0.05 0.43 
Saline (N=7)
5% CO2 (N=6)
10% CO2 (N=6)
PrePeakPPrePeakPPrePeakP
Pda (cmH2O) 35.5±1.6 38.7±1.7 0.021 35.6±1.4 39.4±1.6 0.09 35.5±1.4 38.1±1.6 0.32 
b (ml min−1kg−120.4±2.0 26.9±2.8 <0.001 23.9±2.9 28.4±3.2 0.015 24.1±2.5 30.1±3.6 0.016 
Rs (cm H2O min kg ml−11.82±0.13 1.87±0.16 0.012 1.61±0.20 1.77±0.19 0.013 1.50±0.13 1.59±0.15 0.008 
fh (min−134.5±3.9 26.9±2.8 0.003 33.1±4.7 25.9±3.2 0.74 32.0±4.1 27.9±3.6 0.67 
VAMP (cm) 0.30±0.06 0.40±0.07 0.008 0.35±0.08 0.41±0.08 0.11 0.34±0.08 0.39±0.05 0.43 

Pda, arterial blood pressure; b, cardiac output; Rs, systemic vascular resistance; fh,heart rate; VAMP, ventilation amplitude.

Saline was enriched with either 5% or 10% CO2.

`Pre', data compiled for 10 s prior to the injection; `Peak', the 10 s interval during the 100 s post injection, for which the greatest response was detected; `P', the P value for the one-way RM-ANOVA carried out on the full data set (i.e. the values for the 20 s prior to and 100 s post saline injection).

Values are means ± 1 s.e.m.

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