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Table 2 Cardiovascular performance parameters of C. pagurus under different water PO2 acquired with infra-red photoplethysmography

From: Non-invasive quantification of cardiac stroke volume in the edible crab Cancer pagurus

ConditionNormoxiaHypoxia
Animal12341234
PwO2 during IR-PPG (%air saturation)97.93 ± 0.3697.93 ± 0.3699.32 ± 0.2297.93 ± 0.3616.58 ± 1.64*16.58 ± 1.64*15.63 ± 0.12*16.58 ± 1.64*
99.32 ± 0.2215.63 ± 0.12*
HR (bpm)31.15 ± 15.5172.31 ± 12.1240.99 ± 12.7567.74 ± 1.4947.80 ± 4.02*41.55 ± 3.52*37.41 ± 7.52*33.76 ± 5.30*
25.17 ± 13.3035.03 ± 13.89*
SVP from IR-PPG (log2 relative to normoxia)−0.14 ± 0.57− 0.05 ± 0.38−0.01 ± 0.19−0.01 ± 0.20−0.69 ± 0.21*0.92 ± 0.26*0.48 ± 0.03*−0.57 ± 0.73*
−0.12 ± 0.67−0.05 ± 0.34
  1. Values are given as means ± standard deviation. Normoxic conditions for IR-PPG cover 6 h before the switch to hypoxia. Hypoxic conditions reflect conditions for the last 3 h of low water PO2 levels. Animal 1 was subjected to IR-PPG measurements twice, separated by one week of recovery. Negative values for the SVP show reductions below average control levels. Asterisks show that the value under hypoxia is significantly different from the value under normoxia (Mann-Whitney-rank-sum-test, P < 0.05)