TY - JOUR T1 - Negative neurofunctional effects of frequency, depth and environment in recreational scuba diving: the Geneva “memory dive” study JF - British Journal of Sports Medicine JO - Br J Sports Med SP - 108 LP - 114 DO - 10.1136/bjsm.2002.003434 VL - 38 IS - 2 AU - D O Slosman AU - S de Ribaupierre AU - C Chicherio AU - C Ludwig AU - M-L Montandon AU - M Allaoua AU - L Genton AU - C Pichard AU - A Grousset AU - E Mayer AU - J-M Annoni AU - A de Ribaupierre Y1 - 2004/04/01 UR - http://bjsm.bmj.com/content/38/2/108.abstract N2 - Objectives: To explore relationships between scuba diving activity, brain, and behaviour, and more specifically between global cerebral blood flow (CBF) or cognitive performance and total, annual, or last 6 months’ frequencies, for standard dives or dives performed below 40 m, in cold water or warm sea geographical environments. Methods: A prospective cohort study was used to examine divers from diving clubs around Lac Léman and Geneva University Hospital. The subjects were 215 healthy recreational divers (diving with self-contained underwater breathing apparatus). Main outcome measures were: measurement of global CBF by 133Xe SPECT (single photon emission computed tomography); psychometric and neuropsychological tests to assess perceptual-motor abilities, spatial discrimination, attentional resources, executive functioning, and memory; evaluation of scuba diving activity by questionnaire focusing on number and maximum depth of dives and geographical site of the diving activity (cold water v warm water); and body composition analyses (BMI). Results: (1) A negative influence of depth of dives on CBF and its combined effect with BMI and age was found. (2) A specific diving environment (more than 80% of dives in lakes) had a negative effect on CBF. (3) Depth and number of dives had a negative influence on cognitive performance (speed, flexibility and inhibition processing in attentional tasks). (4) A negative effect of a specific diving environment on cognitive performance (flexibility and inhibition components) was found. Conclusions: Scuba diving may have long-term negative neurofunctional effects when performed in extreme conditions, namely cold water, with more than 100 dives per year, and maximal depth below 40 m. ER -