Figure 4.

Time series of ³¹P‐MR spectra acquired in gastrocnemius medialis and soleus with a multivoxel protocol during one exercise‐recovery experiment comprising rest (2 min), exercise (5 min), and recovery (7 min). Unaveraged spectra are shown, time resolution 6 s (a). Spectra from gastrocnemius medialis and soleus at rest, representing 10 averaged spectra (1 min acquisition time), which were measured either separately using a singlevoxel protocol (b) or using the interleaved multivoxel protocol (c). Resting spectra have identical scale and are zoomed to metabolites, cutting off phosphocreatine, while the inserts show the full scale. All spectra were acquired with 2048 points, bandwidth of 5000 Hz and were filtered with 7 Hz apodisation and zero filled by a factor of 4 for display.