TV Viewing Associated with Poor Glycemic Control

Association with glycemic variables strongest in women

TUESDAY, March 13 (HealthDay News) -- Daily television watching is associated with a lack of glycemic control in non-diabetic women, and the association is stronger with a greater number of hours spent in front of the TV, according to the results of a study published in the March issue of Diabetes Care.

David W. Dunstan, Ph.D., from the International Diabetes Institute in Melbourne, Australia, and colleagues assessed fasting plasma glucose and two-hour post-challenge plasma glucose as well as self-reported television viewing time in 8,357 diabetes-free Australian adults over age 35. Fasting glucose and insulin concentrations were used to calculate the homeostatis model assessment (HOMA) of insulin sensitivity and beta-cell function.

After adjusting for confounders, television viewing was positively associated with two-hour plasma glucose, log fasting insulin, and log HOMA of beta-cell function in women, and inversely associated with log HOMA of insulin sensitivity. The strength of the association increased for women who watched more than three hours of television per day compared with less than one hour per day. For men, the association tended toward significance for two-hour plasma glucose, with no association for other glycemic variables.

"Our findings highlight the unique deleterious relationship of sedentary behavior (indicated by television viewing time) and glycemic measures independent of physical activity time and adiposity status," Dunstan and colleagues conclude. "These relationships differed according to sex and type of glucose measurement, with the two-hour plasma glucose measure being more strongly associated with television viewing."

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