[Muscular intolerance of exercise. Current data].

Our knowledge of the mechanisms leading to exercise intolerance is constantly expanding. Since the discovery of the glycolysis pathway block caused by phosphorylase deficiency as the cause of McArdle's disease, several other glycolysis blocks have been identified constituting a first group of exercise intolerance syndromes. A second group involves mitochondrial anomalies. More recently diverse exercise intolerance syndromes have been associated with insufficient regulation of calcium flow through the sarcoplasmic reticulum, particularly in sporadic cases of malignant hyperthermia with or without hyperthermia. A discrete form of dystrophinopathy is expressed by exercise-induced myalgia with myoglobinuria. Proximal myotonic myopathy also produces pain at exercise. The specificity of other syndromes such as AMP deaminase deficiency or myopathy with tubular aggregates remains debatable. Our understanding of these different syndromes, and their recognized or yet to be elucidated causes, is of practical significance for developing exploration protocols for patients with exercise intolerance with or without myoglobulinuria.