In the present setting we want to investigate the putative negative impact on glucose, lipid, and bone metabolism during a period of restrain from exercise secondary to immobilization following Achilles tendon rupture. We also want to study these patients during their physical active rehabilitation (at week 8 - 52), to establish whether they succeed in improving the metabolic impairments they suffered during the early post-injury period, during which period strong limitations in physical activity is prescribed (week 0 - 8).