Background: The influence of race/ethnicity on the relationship between sedentary\nscreen time and left ventricular mass has been recently suggested, but\nremains a subject of debate, and has never been explored in Africa. Purpose:\nTo determine whether there is a racial/ethnic influence on the relationship\nbetween sedentary screen time and left ventricular mass in MAGhreb and Sub\nSaharan Africa Left-Ventricul ArGEometry Study (MAG-SALVAGES) participants.\nMethods: 100 blacks sub-Saharan African and 187 white Maghreb\naged 18 - 55 years underwent an interview on their behavioral measures, physical\nactivity and eating habits. Their left ventricular mass has also been measured\nby a resting transthoracic echography according to the American Society\nof Echography. Generalized linear models evaluated a test-for-trend across\nhigher levels of sedentary screen time in progressive models with left ventricular\nmeasurements as dependent variables. The study population was stratified\ninto quartiles of sedentary screen time (separately for whites and blacks) and\nexamined the joint association of sedentary screen time and LVM within quartiles\nof physical activity. Results: Among White Maghreb, higher screen time\nwas associated with smaller left ventricular mass (P < 0.001). This association\npersisted when adjusting for age, gender, heart rate, waist circumference, waistto-\nhip ratio, systolic blood pressure QRS duration, TAPS and PAPS. Whereas,\nin blacks sub-Saharan African, the left ventricular mass was not associated\nwith sedentary screen time. Conclusions: Sedentary screen time is associated\nwith smaller left ventricular mass in White Maghreb, not in black sub-Saharan\nAfrican. The lack of association in blacks supports a potential qualitative difference\nin the cardiovascular consequences of sedentary screen based behavior.
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