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Relationship between diet and body fat percentage in female undergraduates

100%

Feč R., Buková A., Brtková M.

Physical Activity Review

2015

vol. 3

22-31

At the turn of the millennium obesity has become the most common metabolic disease due to changes in life conditions and lifestyle. The rise of overweight and obesity is the result of inadequate energy intake relative to its expense. Only 2 to 5% of all cases of overweight or obesity have objective medical causes. In view of energy balance, equally important to the amount of calories consumed is their distribution throughout the day. Other cases are clearly the result of improper lifestyle. A basic remedy to this condition appears to be an increase in the volume of regular physical activities and the establishment of an active healthy lifestyle. The aim of the research under the grant VEGA No. 1/1343/12 "Selected risk factors of obesity and its physical prevention" was to determine the relationship between selected factors of diet and the amount of body fat in female undergraduates. The study group consisted of female students at P.J. Šafarik University (n=620, average age=20.8 years). We examined the eating habits applying a non-standardized questionnaire compiled by ourselves. We followed the frequency of meals and their regularity, (breakfast, dinner), the time and quantity of the meals consumed in the evening hours. We determined the percentage of body fat using an Omron BF51 scale. We calculated the basic statistical characteristics (arithmetic mean, median). In order to detect statistically significant differences between particular variables, we applied the non-parametric Kruskal - Valis analysis of variance (H - test) and the Man - Whitney U test. Statistically significant differences in the percentage of fat was found in students divided into groups according to their responses regarding the variable "Frequency of meals" (p = 0.023), "Dinner regularity " (p = 0.001) and "Dinner time before bedtime" (p = 0.001). The research results show the importance of diet regularity and its optimal frequency. Especially important is the regularity of dinner, while the last meal should not be consumed later than 2 hours before bedtime.

Body composition of undergraduates – comparison of four different measurement methods

88%

Brtková M., Bakalár P., Matúš I., Hančová M., Rimárová K.

Physical Activity Review

2014

vol. 2

38-44

The objective of this study was to determine body composition of university students using four different methods and to find out the extent of agreement between these methods regarding the measurement of body fat percentage in body composition. The study group consisted of 52 students of the P.J. Šafárik University in Košice (29 males and 23 females) whose average age was 22.4 ± 1.9. The study group was formed by convenience sampling. Basic somatometric parameters (body height and weight) were determined and body mass index (BMI) was calculated. The body fat percentage was determined by indirect methods, that is by measuring skinfold thickness at 10 locations on the body using calliper Best II.K501 and by bioimpendance method using devices Bodystat 1500, Omron BF511 (tetra-polar electrode configuration) and Omron BF300 (bi-polar electrode configuration). Profile analysis based on one-sample Hotelling’s test with chi-squared approximation was used for assessing agreement among given four methods of body fat measurements. Statistical analysis of differences among methods was supplemented by the Bland-Altman graphical method with the Wilcoxon paired test. The whole statistical analysis was performed using Excel and software R. Hotteling’s Test (p < 2.2e-16) rejected the hypothesis of agreement between the methods. The greatest influence on this rejection was attributed to the Omron BF511 method. In addition, the results of Wilcoxon’s matched pairs test confirmed the difference of the Omron BF511 method from the other three measurement methods. Bland-Altman graphical analysis showed that the Omron BF511 provided clearly higher values in comparison to the three remaining measurement methods of body fat percentage. The skinfold measurement, the Omron BF300 and the Bodystat 1500 were almost identical. For all the indirect methods it is necessary to validate the accuracy of their measurements using reference methods for the current local population. The skinfold thickness measurement method by Pařízková meets this requirement. Based on our results, the values determined by the devices Omron BF300 and Bodystat 1500 can also be considered applicable. The Omron BF511 does not provide results that could be considered sufficiently accurate for the purposes of research. In order to verify this conclusion the larger group of probands (n = 100 - 300) and a method of repeated measurements would be necessary.

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2 Physical Activity Review

1 2015

1 2014

2 Brtková M.

1 Bakalár P.

1 Buková A.

1 Feč R.

1 Hančová M.

1 Matúš I.

1 Rimárová K.

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Relationship between diet and body fat percentage in female undergraduates

Body composition of undergraduates – comparison of four different measurement methods