Objective To explore the health benefits of high intensity physical activity (MVPA), light intensity physical activity (LPA), and sedentary behavior (SB) substitution for each other in equal time on body mass index (BMI), waist height ratio (WHtR) and body fat percentage (BFP). Methods From November to December 2021, 193 students in a middle school in Tianjin were selected as study subjects. Height, weight, waist circumference, BFP of the participants were measured, BMI and WHtR were calculated. Students were asked to wear Actigraph GT3X acceleration sensor for 7 days, MVPA, LPA and SB were recorded. Multiple linear regression was used to analyze the effects of isochronous substitution of different types of activities on BMI, WHtR and BFP. Results The prevalence of overweight, obesity and abdominal obesity in children was 14.0% (27/193), 17.1% (33/193), and 25.4% (49/193), respectively. Overweight obese children and abdominally obese children showed lower levels of MVPA and LPA, and MVPA and LPA were negatively correlated with BMI, WHtR and BFP (r=-0.416, -0.352, -0.430, -0.358, -0.337, -0.324, P<0.01), while SB was positively correlated with BMI, WHtR and BFP (r=0.456, 0.360, 0.414, P<0.01). Replacing LPA with 15min/d MVPA significantly reduced BMI, WHtR and BFP (P<0.01). BMI, WHtR and BFP were further decreased when SB was replaced by MVPA at 15min/d (P<0.01). Using 15min/d of LPA to replace the equivalent time ofSB also resulted in decrease in BMI, WHtR, and BFP (P< 0.01). Conclusions MVPA isochronous replacement of LPA and SB time can produce good health benefits on BMI, WHtR and BFP, and the same amount of LPA isochronous replacement of SB time can also produce good health benefits.Allocating more SB time to MVPA and LPA can effectively reduce the body fat level of children. In particular, increasing the MVPA time has a better effect on the prevention and treatment of obesity risk in children.
Key words
children /
obesity /
physical activity /
sedentary behavior
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