Objective To understand the status and influencing factors of adolescent sedentary behavior, and to provide a basis for further improving health education and health promotion measures. Method Using multi-stage sampling method survey of 2 186 secondary school students in two cities across the country with adolescent sedentary behavior-psychological scale, including the TTM theoretical model of adolescent sedentary time, sedentary stage of change, change strategy, decision-making balance and the current status of self-efficacy. Results The average sedentary time in the school day was (4.19±1.99) hours per day, average sedentary time in the holidays (4.13±1.68) hours per day, Teaching, the sedentary time region group(χ2=-2.14, P<0.05), gender group (χ2=-4.18, P<0.01)and grade group(χ2=-4.43, P<0.01) were statistically difference, the sedentary time in holidays has statistically difference in grade(χ2=-5.95, P<0.01). Sedentary behavior existed phase behavior change for middle school students, and mainly in the first stages of consciousness and awareness, middle school students in different stages of behavior of sedentary time, once upon a time consciousness stage to operation stage the sedentary time was on the decline, and the maintenance stage increased slightly.Different stages of sedentary behavior change strategy of middle school students, decision balance, self-efficacy scores were statistically significant, the influence of psychological factors on the sedentary time showed the trend that the score decreases from consciousness stage to the action stage and increases in the maintenance stage.The factors of sedentary time in teaching time including gender, grade, stage of behavior change, change strategy, decision balance negative effect, the influence factors of holiday sedentary time including the grade, stage of behavior change, decisional balance (positive and negative). Conclusion The adolescents sedentary behavior time is significantly higher than the standard sedentary time and in a preconscious stage large number of responses to juvenile sedentary behavior target health interventions to recognize that reducing sedentary behavior on health benefits. Key words: The trans-theortical model; Middle-school student; Sedentary behavior
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