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Fig. 4. Recovery of PCr following exercise (A) and hypoxia exposure (B) at 15°C
(squares) and 25°C (circles). Phosphocreatine levels are normalized to the
sum of PCr and Pi and expressed relative to normoxic/resting
controls. NMR data were collected at the fishes' acclimation temperature and
for each time point an average consisting of 256 spectra gathered over 5 min
is shown. Time zero represents the point at which exercise stopped (A) or when
fish were returned to normoxic water (B). In A, transfer of the fish from the
exercise respirometer to the NMR took 
10 min, therefore the recovery
trace does not start at zero. Each point represents mean ± s.e.m.
N=7–10 for each data point.
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