Figure 4. Tissue uptake of glucose and output of lactate and glycerol from the peritendinous space of the human Achilles tendon.

Measurements were taken during rest, intermittent exercise and subsequent recovery every 10 min, using blood concentrations determined at 5 min intervals in the radial artery and interstitial concentrations measured by microdialysis every 10 min. No changes in tissue glucose uptake could be determined during the 30 min of intermittent static exercise with m. triceps surae (P > 0.05). Tissue output of lactate was found to rise significantly (*) as a result of the intermittent static muscles contraction during the exercising period compared with rest values (P < 0.05). The output of lactate from the tissue continued to be significantly (*) increased throughout the recovery period compared with rest (P < 0.05). The tissue output of glycerol was found to be significantly (*) increased during exercise (P < 0.05). The output of glycerol returned to basal levels during the subsequent recovery period (P > 0.05).