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- ÍtemAcceso Abierto
Predictive validity of the body adiposity index in overweight and obese adults using dual-energy X-ray absorptiometry(2016-11) Ramírez-Vélez, Robinson; Correa Bautista, Jorge Enrique; González-Ruíz, Katherine; Triana Reina, Héctor Reynaldo; Vivas, Andrés; García-Hermoso, Antonio; Centro de Estudios en Medición de la Actividad Física (CEMA)The body adiposity index (BAI) is a recent anthropometric measure proven to be valid in predicting body fat percentage (BF%) in some populations. However, the results have been inconsistent across populations. This study was designed to verify the validity of BAI in predicting BF% in a sample of overweight/obese adults, using dual-energy X-ray absorptiometry (DEXA) as the reference method. A cross-sectional study was conducted in 48 participants (54% women, mean age 41.0 ± 7.3 years old). DEXA was used as the “gold standard” to determine BF%. Pearson’s correlation coefficient was used to evaluate the association between BAI and BF%, as assessed by DEXA. A paired sample t-test was used to test differences in mean BF% obtained with BAI and DEXA methods. To evaluate the concordance between BF% as measured by DEXA and as estimated by BAI, we used Lin’s concordance correlation coefficient and Bland–Altman agreement analysis. The correlation between BF% obtained by DEXA and that estimated by BAI was r = 0.844, p < 0.001. Paired t-test showed a significant mean difference in BF% between methods (BAI = 33.3 ± 6.2 vs. DEXA 39.0 ± 6.1; p < 0.001). The bias of the BAI was −6.0 ± 3.0 BF% (95% CI = −12.0 to 1.0), indicating that the BAI method significantly underestimated the BF% compared to the reference method. Lin’s concordance correlation coefficient was considered stronger (ρc = 0.923, 95% CI = 0.862 to 0.957). In obese adults, BAI presented low agreement with BF% measured by DEXA; therefore, BAI is not recommended for BF% prediction in this overweight/obese sample studied. - ÍtemAcceso AbiertoAnthropometric and physical fitness characterization of male elite karate athletes(2014-01-01) Ramírez-Vélez, Robinson; López-Albán, Carlos Alejandro; Meneses-Echávez, José F; Argothy-Bucheli, Rodrigo E; Sánchez-Puccini, María BThis study aimed to assess anthropometric and physical fitness characteristics of male elite karate athletes. Our study was carried out on a sample of 19 male Karate Athletes from Colombia (mean age 31.6±8.8 years). Different anthropometric measurements were taken (weight, height, diameters, circumferences, body composition) from which several anthropometric indices were calculated (body mass index, ponderal index, body index adiposity), and the somatotype was then determined. The performance tests carried out were: Astrand-Ryming protocol, vertical jump, anaerobic power and Wingate anaerobic test. The results (mean±SD) showed a body mass (65.4±12.0 kg), height (167.4±9.3 cm), percent body fat (13.6±3.0 %), ponderal index (41.0±1.8) and body adiposity index (25.1±3.6). The somatotype component values according to the Heath-Carter method were (4.0-4.2-2.1) for the endomorphic, mesomorphic, and ectomorphic components respectively. The aerobic capacity average was (44.8±7.1 ml·kg-1·min-1), vertical jump (32.0±8.7 cm) anaerobic power (90.1±22.7 kg·s-1) and anaerobic capacity (5748.7±1477.5 W). These results may provide a profile of elite karate that can be used as training targets for developing athletes. Our findings provide novel insight for both tactical and functional training.
- ÍtemAcceso AbiertoPhysical fitness and anthropometric normative values among Colombian-Indian schoolchildren(2016) Ramírez-Vélez, Robinson; Correa Bautista, Jorge Enrique; Izquierdo, Mikel; García-Hermoso, Antonio; Ramos Sepúlveda, Jeison Alexander; Centro de Estudios en Medición de la Actividad Física (CEMA)Abstract Background: Substantial evidence indicates that children’s physical fitness levels are markers of their lifestyles and their cardio-metabolic health profile and are predictors of the future risk of chronic diseases such as obesity, cardiometabolic disease, skeletal health and mental health. However, fitness reference values for ethnic children and adolescents have not been published in a Latin-American population. Therefore, the aim of the study was to provide sex- and age-specific physical fitness and anthropometric reference standards among Colombian-Indian schoolchildren. Methods: A sample of 576 participants (319 boys and 257 girls) aged 10 to 17 years old was assessed using the FUPRECOL test battery. Four components of physical fitness were measured: 1) morphological component: height, weight, body mass index (BMI), waist circumference (WC), triceps skinfold, subscapular skinfold, and body fat (%); 2) musculoskeletal component: handgrip and standing long jump test; 3) motor component: speed/agility test (4 × 10 m shuttle run); and 4) cardiorespiratory component: course-navette 20 m, shuttle run test and estimation of maximal oxygen consumption by VO2max indirect. Centile smoothed curves for the 3rd, 10th, 25th, 50th, 75th, 90th and 97th percentiles were calculated using Cole’s LMS method. Results: Our results show that weight, height and BMI in each age group were higher in boys than in girls. In each groups, age showed a significant effect for BMI and WC. Boys showed better than girls in cardiorespiratory fitness, lowerand upper-limb strength and speed/agility and girls performed better in low back flexibility. Conclusion: Our results provide for the first time sex- and age-specific physical fitness and anthropometric reference values for Colombian Nasa Indian children and adolescents aged 10–17.9 years
- ÍtemAcceso AbiertoAcute effects of high intensity, resistance, or combined protocol on the increase of level of neurotrophic factors in physically inactive overweight adults : The BrainFit study(2018) Domínguez-Sánchez, María Andrea; Bustos-Cruz, Rosa H.; Velasco-Orjuela, Gina P; Quintero, Andrea P.; Tordecilla Sanders, María Alejandra; Correa Bautista, Jorge Enrique; Triana Reina, Héctor Reynaldo; García-Hermoso, Antonio; González Ruíz, Katherine; Peña-Gúzman, Carlos A.; Hernández, Enrique; Peña-Ibagon, Jhonatan C; Téllez-T, Luis Andrés; Izquierdo, Mikel; Ramírez-Vélez, RobinsonThe purpose of this study was to compare the neurotrophic factor response following one session of high-intensity exercise, resistance training or both in a cohort of physically inactive overweight adults aged 18-30 years old. A randomized, parallel-group clinical trial of 51 men (23.6 ± 3.5 years; 83.5 ± 7.8 kg; 28.0 ± 1.9 kg/m2) who are physically inactive (i.e., < 150 min of moderate-intensity exercise per week or IPAQ score of < 600 MET min/week for > 6 months) and are either abdominally obese (waist circumference ≥90 cm) or have a body mass index, BMI ≥25 and ≤ 30 kg/m2 were randomized to the following four exercise protocols: high-intensity exercise (4 × 4 min intervals at 85-95% maximum heart rate [HRmax] interspersed with 4 min of recovery at 75-85% HRmax) (n = 14), resistance training (12-15 repetitions per set, at 50-70% of one repetition maximum with 60 s of recovery) (n = 12), combined high-intensity and resistance exercise (n = 13), or non-exercising control (n = 12). The plasma levels of neurotrophin-3 (NT-3), neurotrophin-4 (also known as neurotrophin 4/5; NT-4 or NT-4/5), and brain-derived neurotrophic factor (BDNF) were determined before (pre-exercise) and 1-min post-exercise for each protocol session. Resistance training induced significant increases in NT-3 (+39.6 ng/mL [95% CI, 2.5-76.6; p = 0.004], and NT-4/5 (+1.3 ng/mL [95% CI, 0.3-2.3; p = 0.014]), respectively. Additionally, combined training results in favorable effects on BDNF (+22.0, 95% CI, 2.6-41.5; p = 0.029) and NT-3 (+32.9 ng/mL [95% CI, 12.3-53.4; p = 0.004]), respectively. The regression analysis revealed a significant positive relationship between changes in BDNF levels and changes in NT-4/5 levels from baseline to immediate post-exercise in the combined training group (R2 = 0.345, p = 0.034) but not the other intervention groups. The findings indicate that acute resistance training and combined exercise increase neurotrophic factors in physically inactive overweight adults. Further studies are required to determine the biological importance of changes in neurotrophic responses in overweight men and chronic effects of these exercise protocols. © 2018 Domínguez-Sanchéz, Bustos-Cruz, Velasco-Orjuela, Quintero, Tordecilla-Sanders, Correa-Bautista, Triana-Reina, García-Hermoso, González-Ruíz, Peña-Guzmán, Hernández, Peña-Ibagon, Téllez-T, Izquierdo and Ramírez-Vélez.
- ÍtemAcceso AbiertoBody Adiposity Index Performance in Estimating Body Fat Percentage in Colombian College Students : Findings from the FUPRECOL-Adults Study(2017-01-17) Ramírez-Vélez, Robinson; Correa Bautista, Jorge Enrique; González-Ruíz, Katherine; Vivas, Andrés; Triana Reina, Héctor Reynaldo; Martínez Torres, Javier; Prieto-Benavides, Daniel Humberto; Carrillo, Hugo Alejandro; Ramos Sepúlveda, Jeison Alexander; Villa González, Emilio; García-Hermoso, Antonio; Centro de Estudios en Medición de la Actividad Física (CEMA)Abstract: Recently, a body adiposity index (BAI = (hip circumference)/((height)(1.5))−18) was developed and validated in adult populations. The aim of this study was to evaluate the performance of BAI in estimating percentage body fat (BF%) in a sample of Colombian collegiate young adults. The participants were comprised of 903 volunteers (52% females, mean age = 21.4 years ± 3.3). We used the Lin’s concordance correlation coefficient, linear regression, Bland–Altman’s agreement analysis, concordance correlation coefficient (ρc) and the coefficient of determination (R 2 ) between BAI, and BF%; by bioelectrical impedance analysis (BIA)). The correlation between the two methods of estimating BF% was R 2 = 0.384, p < 0.001. A paired-sample t-test showed a difference between the methods (BIA BF% = 16.2 ± 3.1, BAI BF% = 30.0 ± 5.4%; p < 0.001). For BIA, bias value was 6.0 ± 6.2 BF% (95% confidence interval (CI) = −6.0 to 18.2), indicating that the BAI method overestimated BF% relative to the reference method. Lin’s concordance correlation coefficient was poor (ρc = 0.014, 95% CI = −0.124 to 0.135; p = 0.414). In Colombian college students, there was poor agreement between BAI- and BIA-based estimates of BF%, and so BAI is not accurate in people with low or high body fat percentage levels.
