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Objectively measured physical activity levels and sedentary time in 7-9-year-old Estonian schoolchildren: independent associations with body composition parameters.

Riso EM, Kull M, Mooses K, Hannus A, Jürimäe J - BMC Public Health (2016)

Bottom Line: The results of present study showed that about 11 % of primary school children were engaged in PA of at least 60 min of MVPA daily.While MVPA is negatively associated with fat mass indices and positively associated with FFM regardless of different confounders, sedentary time is negatively related to FFM and positively with fat mass values after adjusting for several confounders.These results suggest that higher MVPA level and lower sedentary time level are important in maintaining and developing healthy body composition in primary school children during growth.

View Article: PubMed Central - PubMed

Affiliation: Institute of Sports Sciences and Physiotherapy, University of Tartu, 5 Jakobi St, Tartu, 51014, Estonia. eva-maria.riso@ut.ee.

ABSTRACT

Background: Sufficient daily physical activity (PA) is necessary for physical, social and mental health benefits during growth. Most of the available data on children is based on subjective reports, while only limited data on objective PA and sedentary levels is available for primary school children. Increased PA is also an important health indicator of body composition parameters, especially body adiposity indices. The aim of the present study was to determine objectively the amount of daily PA levels at different intensities and sedentary time in normal-weight (NW) and overweight (OW) 7-9-year-old boys and girls, and to find associations between objectively measured PA levels and sedentary time with different body composition values.

Methods: Two hundred and seventy eight (142 boys and 136 girls) primary school children aged 7.9 ± 0.7 years participated in this study. Objective PA intensity and sedentary levels were measured over 7 days by accelerometry. Indices of total fat mass (body fat %, sum of skinfolds), fat distribution (waist-to-height ratio) and muscular component (fat free mass [FFM]) were calculated from measured anthropometric parameters.

Results: There were no differences (p > 0.05) in PA intensity levels and sedentary time between boys and girls as well as between NW and OW children. About 11 % of children met the current guidelines of at least 60 min per day of moderate-to-vigorous PA (MVPA). Sedentary time was positively and negatively associated (p < 0.05) with all body fat and FFM values, respectively. Moderate and vigorous PA along with MVPA were negatively and positively associated (p < 0.05) with all body fat and FFM indices, respectively.

Conclusions: The results of present study showed that about 11 % of primary school children were engaged in PA of at least 60 min of MVPA daily. While MVPA is negatively associated with fat mass indices and positively associated with FFM regardless of different confounders, sedentary time is negatively related to FFM and positively with fat mass values after adjusting for several confounders. These results suggest that higher MVPA level and lower sedentary time level are important in maintaining and developing healthy body composition in primary school children during growth.

No MeSH data available.


Related in: MedlinePlus

Sedentary time and different PA levels of normal-weight (NW) and overweight (OW) children; values are presented as mean ± SD
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Fig2: Sedentary time and different PA levels of normal-weight (NW) and overweight (OW) children; values are presented as mean ± SD

Mentions: Descriptive characteristics of the study sample are shown in Table 1. There were no differences (p > 0.05) in age, BMI, FM and WHtR between the groups studied, while height, body mass, FFM and waist circumference were significantly higher (p < 0.05) in boys compared with girls. In contrast, girls had higher (p < 0.05) body fat % and sum of skinfolds values in comparison with boys. Almost 30 % (n = 83) of the children were classified as overweight or obese based on the international cut-off points [25] including 56 overweight (20.1 % of whole sample) and 27 (9.7 % of whole sample) obese children. Overall, 10.8 % (n = 30) of children had a WHtR of ≥ 0.5. Average wearing time of accelerometers was 804.4 ± 44.5 min/day, which did not differ between boys and girls or between NW and OW children. Almost 11 % of children were compliant with current PA recommendations. More than half of the children (60.5 %) were engaged in MVPA 60 min or more over all measured days. Boys exceeded (p < 0.05) girls in time spent in MPA level, while no differences (p > 0.05) were seen in sedentary time and other PA intensities between studied groups (Table 1; Fig. 1). Most of the accelerometer wearing time was spent being sedentary (54 %) with slightly more than one-third of wearing time spent in LPA (37 %). Only 8.5 % of the total time accounted for MVPA in which more time was spent in MPA (5.8 %) (Fig. 1). No differences (p > 0.05) were found in different PA intensities and time spent sedentary between NW and OW children (Fig. 2). There was a difference in activity behaviour between the weekdays and weekend days (p < 0.05). Higher PA levels were observed during the weekdays (Tables 2 and 3). During the weekend days, sedentary time and time spent in different PA intensities were significantly lower than during weekdays (p < 0.05) (Tables 2 and 3). The average measured time was significantly different between weekdays and weekend days (Tables 2 and 3). The percentage of time spent sedentary was similar in both weekdays and weekend days (Tables 2 and 3). Among boys the percentage of time spent in LPA was higher, and the proportion of time spent in MPA, VPA and MVPA was lower on weekend days than on weekdays (p < 0.05) (Table 2). The girls had a higher proportion of LPA on weekend days (p < 0.05), whereas the proportion of MPA, VPA and MVPA remained similar between weekend days and weekdays (Table 3). In total study sample, the proportion of LPA was higher on weekend days than on weekdays, and the proportion of MPA, VPA and MVPA were lower on weekend days than on weekdays (p < 0.05) (Table 2). Among OW children, the percentage of LPA was higher and the percentage of MPA was lower (p < 0.05) on weekend days compared with weekdays (Table 3).Table 1


Objectively measured physical activity levels and sedentary time in 7-9-year-old Estonian schoolchildren: independent associations with body composition parameters.

Riso EM, Kull M, Mooses K, Hannus A, Jürimäe J - BMC Public Health (2016)

Sedentary time and different PA levels of normal-weight (NW) and overweight (OW) children; values are presented as mean ± SD
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4835886&req=5

Fig2: Sedentary time and different PA levels of normal-weight (NW) and overweight (OW) children; values are presented as mean ± SD
Mentions: Descriptive characteristics of the study sample are shown in Table 1. There were no differences (p > 0.05) in age, BMI, FM and WHtR between the groups studied, while height, body mass, FFM and waist circumference were significantly higher (p < 0.05) in boys compared with girls. In contrast, girls had higher (p < 0.05) body fat % and sum of skinfolds values in comparison with boys. Almost 30 % (n = 83) of the children were classified as overweight or obese based on the international cut-off points [25] including 56 overweight (20.1 % of whole sample) and 27 (9.7 % of whole sample) obese children. Overall, 10.8 % (n = 30) of children had a WHtR of ≥ 0.5. Average wearing time of accelerometers was 804.4 ± 44.5 min/day, which did not differ between boys and girls or between NW and OW children. Almost 11 % of children were compliant with current PA recommendations. More than half of the children (60.5 %) were engaged in MVPA 60 min or more over all measured days. Boys exceeded (p < 0.05) girls in time spent in MPA level, while no differences (p > 0.05) were seen in sedentary time and other PA intensities between studied groups (Table 1; Fig. 1). Most of the accelerometer wearing time was spent being sedentary (54 %) with slightly more than one-third of wearing time spent in LPA (37 %). Only 8.5 % of the total time accounted for MVPA in which more time was spent in MPA (5.8 %) (Fig. 1). No differences (p > 0.05) were found in different PA intensities and time spent sedentary between NW and OW children (Fig. 2). There was a difference in activity behaviour between the weekdays and weekend days (p < 0.05). Higher PA levels were observed during the weekdays (Tables 2 and 3). During the weekend days, sedentary time and time spent in different PA intensities were significantly lower than during weekdays (p < 0.05) (Tables 2 and 3). The average measured time was significantly different between weekdays and weekend days (Tables 2 and 3). The percentage of time spent sedentary was similar in both weekdays and weekend days (Tables 2 and 3). Among boys the percentage of time spent in LPA was higher, and the proportion of time spent in MPA, VPA and MVPA was lower on weekend days than on weekdays (p < 0.05) (Table 2). The girls had a higher proportion of LPA on weekend days (p < 0.05), whereas the proportion of MPA, VPA and MVPA remained similar between weekend days and weekdays (Table 3). In total study sample, the proportion of LPA was higher on weekend days than on weekdays, and the proportion of MPA, VPA and MVPA were lower on weekend days than on weekdays (p < 0.05) (Table 2). Among OW children, the percentage of LPA was higher and the percentage of MPA was lower (p < 0.05) on weekend days compared with weekdays (Table 3).Table 1

Bottom Line: The results of present study showed that about 11 % of primary school children were engaged in PA of at least 60 min of MVPA daily.While MVPA is negatively associated with fat mass indices and positively associated with FFM regardless of different confounders, sedentary time is negatively related to FFM and positively with fat mass values after adjusting for several confounders.These results suggest that higher MVPA level and lower sedentary time level are important in maintaining and developing healthy body composition in primary school children during growth.

View Article: PubMed Central - PubMed

Affiliation: Institute of Sports Sciences and Physiotherapy, University of Tartu, 5 Jakobi St, Tartu, 51014, Estonia. eva-maria.riso@ut.ee.

ABSTRACT

Background: Sufficient daily physical activity (PA) is necessary for physical, social and mental health benefits during growth. Most of the available data on children is based on subjective reports, while only limited data on objective PA and sedentary levels is available for primary school children. Increased PA is also an important health indicator of body composition parameters, especially body adiposity indices. The aim of the present study was to determine objectively the amount of daily PA levels at different intensities and sedentary time in normal-weight (NW) and overweight (OW) 7-9-year-old boys and girls, and to find associations between objectively measured PA levels and sedentary time with different body composition values.

Methods: Two hundred and seventy eight (142 boys and 136 girls) primary school children aged 7.9 ± 0.7 years participated in this study. Objective PA intensity and sedentary levels were measured over 7 days by accelerometry. Indices of total fat mass (body fat %, sum of skinfolds), fat distribution (waist-to-height ratio) and muscular component (fat free mass [FFM]) were calculated from measured anthropometric parameters.

Results: There were no differences (p > 0.05) in PA intensity levels and sedentary time between boys and girls as well as between NW and OW children. About 11 % of children met the current guidelines of at least 60 min per day of moderate-to-vigorous PA (MVPA). Sedentary time was positively and negatively associated (p < 0.05) with all body fat and FFM values, respectively. Moderate and vigorous PA along with MVPA were negatively and positively associated (p < 0.05) with all body fat and FFM indices, respectively.

Conclusions: The results of present study showed that about 11 % of primary school children were engaged in PA of at least 60 min of MVPA daily. While MVPA is negatively associated with fat mass indices and positively associated with FFM regardless of different confounders, sedentary time is negatively related to FFM and positively with fat mass values after adjusting for several confounders. These results suggest that higher MVPA level and lower sedentary time level are important in maintaining and developing healthy body composition in primary school children during growth.

No MeSH data available.


Related in: MedlinePlus