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Table 2.

Properties of skeletal muscle mitochondria from control and overwintering frogs

Mitochondrial propertiesChange during overwintering submergence (%)
CS activity1 -52 
State 3 rate2 -58 
State 4 rate2 -52 
Proton leak rate3 -51 
State 3 P50value2 -55 
State 4 P50value2 
Mitochondrial propertiesChange during overwintering submergence (%)
CS activity1 -52 
State 3 rate2 -58 
State 4 rate2 -52 
Proton leak rate3 -51 
State 3 P50value2 -55 
State 4 P50value2 

The change during overwintering submergence represents the difference between values for control and 4-month-hypoxic submerged frogs as a percentage of the control value.

Citrate synthase (CS) P50 values express the Km values for oxygen for the isolated mitochondria.

1

St-Pierre and Boutilier(2001); 2St-Pierre et al. (2000b), data taken from experiments performed at 3 °C; 3St-Pierre et al.(2000a).

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