BMJ 2008; 337 doi: http://dx.doi.org/10.1136/bmj.a2150 (Published 21 October 2008) Cite this as: BMJ 2008;337:a2150

In sports medicine, concussion means a brief period of unconsciousness caused by head trauma. Although recovery is usually rapid, there’s evidence that cerebral dysfunction persists for much longer. How soon should an athlete who has experienced concussion be allowed to return to sporting activities? A review in Archives of Neurology (2008;65:1158-61, http://archneur.ama-assn.org) reckons that they should wait at least a month.

γ glutamyltransferase, which is present on the external surface of most cells and in serum, is the enzyme responsible for the extracellular catabolism of glutathione. Raised plasma concentrations are widely used as an indicator of liver disease and as a marker of excessive alcohol intake. A large longitudinal study from Austria (Arteriosclerosis, Thrombosis, and Vascular Biology 2008;28:1857-65, doi:10.1161/ATVBAHA.108.170597) finds that increasing levels over time are also associated with risk of fatal cardiovascular disease, particularly in younger people. The authors suggest that longitudinal monitoring may be useful in primary prevention of cardiovascular disease.

An analysis of world records in nine track and field athletic events shows striking improvements over the past century (British Medical Bulletin 2008;87:7-15, doi:10.1093/bmb/ldn029). The rate …

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