Body Mass Index and Body Fat Percentage in Assessment of Obesity Prevalence in Saudi Adults

Objective To assess the obesity prevalence in body mass index （BMI） and body fat percentage Saudi adults according to the international standards of （BF%）. Methods Five hundred and thirty healthy Saudi adults aged 18-72 years （mean 36.91＋15.22 years） were enrolled in this study. Their body composition was assessed by bioelectrical impendence analysis with a commercially available body composition analyzer. Standard BMI and BF% values were used to define obesity. Results The prevalence of underweight, normal underweight, overweight and obesity in Saudi adults according to the BMI criteria （〈18.5 kg/mz, 18.5-24.4 kg/m2, 25-29.9 kg/m2, 30 k＆/m2 and above, respectively） was 2.5%, 30.2%, 33.6%, and 33.8%, respectively, whereas the obesity prevalence was 60% （n=31g） in Saudi adults according to the BF% criteria （25% for males and 30% for females）, which was significantly higher than that according to BMI criteria. However, it was 50.6% （n=268） when the BMI cutoff point was 27.5 kg/m2, proposed by WHO for the Asian population. Kappa analysis showed that the obesity prevalence defined by BMI and BF% was higher in females than in males （k=0.530 vs k=0.418, P〈O.O001）. The sensitivity and specificity of BMI （30 kg/m2 and 27.5 kg/m2） were 54.1% and 96.7% and 76.4% and 88.2%, respectively, for obesity. A lower BMI cutoff point （26.60 kg/m2） was proposed in this study, which gave the maximum sensitivity （84.3%） and specificity （85.4%）, with a moderate kappa agreement （k=0.686）. Moreover, the obesity prevalence at this cutoff point （56.4%） was significantly higher than that recommended by WHO. Conclusion The specificity of BMI for obesity is high and its sensitivity is low in both sexes. Its sensitivity can be increased by changing BMI cutoff to a lower value. The choice of BF% reference is of great influence for the assessment of obesity prevalence according to the BMI.

The Relationship between Maximum Oxygen Consumption （VO2 Max） and Body Fat Percentage of the Male Secondary School Pupils （15-18 Years）

The purpose of this study was to find out the type of relationship between VO2 max and percentage of body fat in male secondary school students. The research sample consisted of 30 male students studying at Al-Khawarizmi High School in Tlemcen. Their average age was 16.56 ± 0.69. We based our research on books and scientific journals, site visits, and personal meeting. We used the descriptive approach. The test was carried out and the measurements were taken at the institution＇s yard and the doctor＇s office respectively. We used the running test for one mile to measure the maximum oxygen consumption. The skin folds were taken in three areas： the chest, abdomen and mid-thigh, to estimate the proportion of fat in the body. The results showed that the relationship between maximum oxygen consumption and body fat percentage was strongly reversed at a significant level of 0.01, with Pearson correlation coefficient -0.597.

Phantom of Human Adipose Tissue and Studies of Light Propagation and Light Absorption for Parameterization and Evaluation of Noninvasive Optical Fat Measuring Devices

A method for noninvasive determination of fat and water content in the human body is examined. A spatially resolved spectroscopy method is used which can record low intensity near infrared spectra. This novel approach is compared to other methods for the determination of fat and water content. Monte Carlo simulations of light propagation in tissue are shown and the production and characterization of optical phantoms of adipose tissue are investigated.

The Comparison of the Effects of Two Types of High Intensity Interval Training （HILT） on Body Mass and Physiological Indexes in Inactive Female Students

The aim of this study was to compare the effects of two types of high intensity interval training （HIIT） on body mass and physiological indexes in inactive female students. 27 inactive female students （mean age 24.81 ±0.66 yr, height 162.09 ±0.67 cm, weight 59.41 ±0.33 kg） were voluntarily selected and randomly assigned to three groups （each group = 9 subjects） of high intensity interval training （type I）, high intensity interval training （type 2） and control. HIIT （type 1） （8 seconds of sprint running and 12 seconds of active recovery） was performed for 4 weeks, 3 sessions per week, 6-9 min. per session with above 90% maxHR. HIlT （type 2） （40-m shuttle run test with maximum speed） was performed with above 90% max HR while the control group did not participate in any training. Data analysis with dependent t test showed that HIIT （type 1） and HIlT （type 2） significantly increased VO2max while they decreased fat percentage and BMI. The intergroup data were analyzed by one-way ANOVA at P 〈 0.05. The results showed a significant difference among HIlT （type 1）, HIIT （type 2） and control groups in VO2max, BMI and fat percentage.

The variation of skinfold thickness of Mulam adults in China

The skinfold thickness of six items （facial skinfold, subscapular skinfold, suprailiac skinfold, biceps skinfold, triceps skinfold and calf skinfold） were measured in 465 Mulam adults （232 male and 233 female）. The results were as follows： （1） The average skinfold thickness are higher in female at every age group. （2） As a whole, the skinfold thickness in the body of trunk is bigger than that in the limbs in both male and female. The curves of biceps skinfold thickness and calf skinfold thickness of male doesn＇t fluctuate with age. Body fat percentage of male was the lowest in the 30s group. In female, the skinfold thickness of trunk and triceps increase with age while calf skinfold decreases. Body fat percentage of female increases with age but then decreases after 50 years old. （3） The mean vales of Mulam skinfold thickness are relatively low compared with Daur, Uzbek and Han nationality.

Monitoring Training Load,Muscle Damage,and Body Composition Changes of Elite Indian Rowers During a Periodized Training Program

Purpose The purpose of this study was to monitor the Indian national rowing team’s training regime and the changes that occur in the rowers’body composition,muscle cell damage,and training load markers during the phases of preparation for an international competition.Methods Ten male and 9 female elite rowers from the national team underwent anthropometric assessment and blood tests during 17 weeks of training,at the end of general preparation(W4),preparation(W10),and pre-competition(W17)phase.Body fat%and somatotype were determined by Siri’s equation and Heath-Carter manual,respectively.Assessments of blood biomarkers included measures of creatine phosphokinase(CPK),lactate dehydrogenase(LDH),urea,uric acid,testosterone,and cortisol concentration.Results Changes in variables were estimated by repeated-measures ANOVA.Body fat%(P<0.001;male:d=−2.03;female:d=−2.89)and endomorph(P<0.05;male:d=−2.05;female:d=−0.68)decreased significantly at pre-competition,whereas weight,mesomorph,and ectomorph remained unchanged throughout training.Urea(male:d=−1.47;female:d=−1.46)and uric acid(male:d=−0.74;female:d=−1.71)showed a significant decrease at pre-competition phase in both groups.CPK concentration significantly(P<0.05)decreased at preparation(d=−1.05)and increased during pre-competition(d=−1.28)in male rowers.LDH showed significant increase(P<0.01)at preparation(male:d=1.17;female:d=2.02)and pre-competition(male:d=1.28;female:d=2.09)than base preparation.Whereas,no significant changes were observed in cortisol,testosterone,or T/C ratio in subsequent measurements.Significant correlation(P<0.05)was found between LDH and T/C ratio with rowing timing in male rowers.The 2000 m rowing timing also showed a significant improvement at W17 compared to W4(male:d=−1.25;female:d=−0.94).Conclusion In conclusion,our results showed that rowers encounter more muscle damage and less protein catabolism during training season.Additionally,it is evidenced that rowing performance improved and biochemical markers-particularly enzymes-altered largely with altered training load rather than anabolic or catabolic hormone concentration in rowers.

An Assessment of Predisposing Factors of Atherogenic Dyslipidemia in an Urban Pediatric Population in Cameroon

Background: Dyslipidemia in childhood contributes to an increased risk of cardiovascular diseases later in life. This study sets out to determine the prevalence of dyslipidemia and describe the associations between selected variables and dyslipidemia in Cameroon urban children. Methods: This cross-sectional hospital-based study included 415 children (188 boys and 227 girls) between the ages of 5 and 16 years. Dyslipidemia was defined as an abnormal value of one or more of the following lipids: Total cholesterol (TC), triglycerides (TG), low-density lipoprotein cholesterol (LDL-C) and high-density lipoprotein cholesterol (HDL-C). Percentage body fat (%BF) was estimated using bio-electric impedance analysis. A structured questionnaire was used by parents to report physical activity, screen time and eating habits of the children. Relationships between predictors and dyslipidemia were assessed using multiple binary logistic regression analyses. Results: The prevalence of dyslipidemia was 46.0%. Dyslipidemic children had significantly higher %BF, TG and LDL-C and lower HDL-C than the normal children (p p = 0.004), short stature (OR 2.8, 95% CI 1.1 - 6.8, p = 0.041), physical activity p Conclusion: This study confirms that obesity, short stature, physical activity < 60 minutes/day and never/occasional consumption of fruits/vegetables were associated with dyslipidemia. Also, a high proportion of children had one or more lipid disorders. This is concerning and indicates the importance of assessing dyslipidemia in pre-school children in future studies.