Kinematic variations in the barbell back squat under different footwear conditions in female college athletes.

BACKGROUND: The barbell back squat is one of the most performed exercises, being important for the strengthening of lower limbs and trunk. Recently, it has become popular to train under different conditions of footwear or without it, and some investigations have analyzed the changes that this brings, with some contradictions in this regard. The purpose of this study was to analyze the kinematic variations under different shoe conditions (running shoes, barefoot and barefoot with heel raised) in the back squat in female university athletes. METHODS: Fifteen athletes in the three conditions with a load equal to 70% of their one-maximum repetition (1RM), were recorded and analyzed to determine the angles of the ankle, knee, hip and trunk by five movements in each condition. RESULTS: The use of enhancement significantly increased (P<0.05) the dorsal flexion angle of the ankle, against the footwear condition and barefoot without enhancement (109.6±11.1° vs. 99.1±9.0° vs. 101.3±11.5°). No significant differences were observed in any of the other variables. CONCLUSIONS: An optimal squat technique is important for preventing injuries, optimal rehabilitation and for improving sports performance. Increased dorsal ankle flexion angle may protect distal tibiofibular joint.

[Cut-off points of anthropometric markers for hypertension and hyperglycemia in Argentine adults: a cross-sectional study from the 4th ENFR] / Puntos de corte de indicadores antropométricos para hipertensión e hiperglucemia en adultos argentinos

Introduction: High waist circumference (WC), waist-to-height ratio (WHtR), and body mass index (BMI) are associated with increased cardiometabolic risk. The objective was to identify anthropometric cut-off points that allow discriminating subjects at increased risk of presenting high blood pressure and glycemia in Argentine adults. Methods: The results of the 4th Argentine ENFR were used. Subjects aged 18 to 65 years who had blood pressure, blood glucose, and anthropometry directly measured were included (n=4254 and 1683 subjects of both sexes for high blood pressure and blood glucose, respectively). The area under the ROC curve was calculated. The optimal cut-off point was the one with the smallest difference between sensitivity and specificity. Adjusted odds ratios (aOR) were calculated for each point. Results: In men, the cut-off points for high blood pressure were WC=91.5 cm (aOR= 3.55; 95% CI=2.97-4.24), WHtR=0.541 (aOR=3.12; 95% CI =2.61-3.73) and BMI=27.0 kg/m2 (aOR=3.04; CI95%=2.55-3.63); and for high blood glucose WC=94.5 cm (aOR=2.46; 95% CI=1.64-3.70), WHtR =0.559 (aOR=2.35; 95% CI=1.55-3.55) and BMI=28.6 kg/m2 (aOR= 3.23; CI95%=2.14-4.88). In women, for high blood pressure, WC=88.5 cm (aOR=3.57; 95% CI=2.84-4.41), WHtR=0.542 (aOR=3.45; 95% CI=2.79- 4.27) and BMI=26.7 kg/m2 (aOR=3.25; CI95%=2.64-4.02); and for high blood glucose WC=93.5 cm (aOR=4.28; 95% CI=2.72-6.75), WHtR =0.573 (aOR=3.61; 95% CI=2.31-5.66) and BMI=27.8 kg/m2 (aOR= 3.14; CI95%=2.03-4.87). Conclusion: Argentine adults who have WC measured on the skin and are above the cut-off points identified here, have a significantly higher risk of presenting high blood pressure and hiperglycemia.

Introducción: Circunferencia de cintura (CC), índice cintura/talla (ICT) e índice de masa corporal (IMC) elevados se relacionan con mayor riesgo cardiometabólico. El objetivo fue identificar puntos de corte antropométricos que permitan discriminar a sujetos en riesgo aumentado de presentar tensión arterial y glucemia elevadas en adultos argentinos. Métodos: Se utilizaron los resultados de la 4ta ENFR argentina. Se incluyeron sujetos de 18 a 65 años a quienes se les haya medido directamente tensión arterial, glucemia y antropometría (n=4.254 y 1.683 sujetos de ambos sexos para tensión arterial y glucemia elevadas respectivamente). Se calculó el área bajo la curva ROC. El punto de corte óptimo fue el que presentó menor diferencia entre sensibilidad y especificidad. Se calcularon odds ratios ajustados (ORa) para cada punto. Resultados: En varones los puntos de corte para tensión arterial elevada fueron CC=91,5 cm (ORa=3,55; IC95%=2,97-4,24), ICT=0,541 (ORa=3,12; IC95%=2,61-3,73) e IMC=27,0 kg/m2 (ORa=3,04; IC95%=2,55-3,63); y para glucemia elevada CC=94,5 cm (ORa=2,46; IC95%=1,64-3,70), ICT=0,559 (ORa=2,35; IC95%=1,55-3,55) e IMC=28,6 kg/m2 (ORa= 3,23; IC95%=2,14-4,88). En mujeres, para tensión arterial elevada fueron CC=88,5 cm (ORa=3,57; IC95%=2,84-4,41), ICT=0,542 (ORa=3,45; IC95%=2,79-4,27) e IMC=26,7 kg/m2 (ORa=3,25; IC95%=2,64-4,02); y para glucemia elevada CC=93,5 cm (ORa=4,28; IC95%=2,72-6,75), ICT=0,573 (ORa=3,61; IC95%=2,31-5,66) e IMC=27,8 kg/m2 (ORa=3,14; IC95%=2,03-4,87). Conclusión: Los adultos argentinos a quienes se les mida CC sobre la piel y se encuentren por encima de los puntos de corte aquí identificados, cuentan con un riesgo significativamente mayor de presentar tensión arterial y glucemia elevadas.