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Abstract Aims: To determine lactate threshold (LT) by three different methods (visual inspection, algorithmic adjustment, and Dmax) during an incremental protocol performed in the leg press 45° and to evaluate correlation and agreement among these different methods. Methods: Twenty male long-distance runners participated in this study. Firstly, participants performed the dynamic force tests in one-repetition maximum (1RM). In the next session, completed an incremental protocol consisted of progressive stages of 1 min or 20 repetitions with increments of 10, 20, 25, 30, 35, and 40% 1RM. From 40% 1RM, increments corresponding to 10% 1RM were performed until a load in which the participants could not complete the 20 repetitions. A rest interval of 2 min was observed between each stage for blood collection and adjustment of the workloads for the next stage. Results: Our results showed no significant difference in relative load (% 1RM), good correlations, and high intraclass correlation coefficients (ICC) between algorithmic adjustment and Dmax (p = 0.680, r = 0.92; ICC = 0.959), algorithmic adjustment and visual inspection (p = 0.266, r = 0.91; ICC = 0.948), and Dmax and visual inspection (p = 1.000, r = 0.88; ICC = 0.940). In addition, the Bland-Altman plot and linear regression showed agreement between algorithmic adjustment and Dmax (r2 = 0.855), algorithmic adjustment and visual inspection (r2 = 0.834), and Dmax and visual inspection (r2 = 0.781). Conclusion: The good correlation and high agreement among three methods suggest their applicability to determine LT during an incremental protocol performed in the leg press 45°. However, the best agreement found between mathematical methods suggests better accuracy.
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Humans , Running , Anaerobic Threshold , Endurance Training , Algorithms , AnthropometryABSTRACT
Objetivo: Evaluar la utilidad de los métodos de diagnóstico, la efectividad de la paratiroidectomía y sus complicaciones. Sede: Hospital de Especialidades del Centro Médico Nacional Siglo XXI. Diseño: Estudio retrospectivo, descriptivo, observacional, transversal. Análisis estadístico: Medidas de tendencia central más pruebas de valor diagnóstico. Pacientes y método: Se incluyeron 21 pacientes adultos consecutivos operados por hiperparatiroidismo primario (HPTP), del 1 de enero al 31 de diciembre de 2009. Las variables analizadas fueron: edad, género, antecedentes familiares de patología paratiroidea, manifestaciones clínicas, cuantificación de niveles séricos de calcio, fósforo y hormona paratiroidea en preoperatorio y postoperatorio, depuración de creatinina y densitometría ósea; valor diagnóstico de estudios preoperatorios de localización y reporte histopatológico. Resultados: El 90% de los pacientes perteneció al sexo femenino y la edad media fue de 57 años. La nefrolitiasis, hipertensión arterial sistémica y fatiga fueron las manifestaciones clínicas y entidades asociadas con mayor frecuencia a hiperparatiroidismo primario. La ultrasonografía y la centellografía mostraron baja sensibilidad, bajo valor predictivo positivo, moderada especificidad y moderado valor predictivo negativo. El abordaje quirúrgico fue unilateral en 10 pacientes (47.5%), bilateral en 52.5%; la efectividad terapéutica fue de 85.7% en la primera intervención y 100% en la reintervención. Se registraron complicaciones en el 4.7% de los pacientes. Conclusión: En esta serie los pacientes con hiperparatiroidismo primario presentaron nefrolitiasis con mayor frecuencia; la sensibilidad diagnóstica de la ultrasonografía y centellografía en relación con la localización específica de las glándulas es inferior a lo informado. Se tuvo alta efectividad quirúrgica de la paratiroidectomía y baja frecuencia de complicaciones.
Objective: To assess the usefulness of the diagnostic methods and the efficacy of parathyroidectomy and its complications. Setting: Third level health care center (Specialty Hospital of the National Medical Center ''Siglo XXI'') Design: Retrospective, descriptive, observational, cross-sectional study. Statistical analysis: Central tendency measures and diagnostic value tests. Patients and method: The study included 21 consecutive adult patients subjected to surgery due to primary hyperparathyroidism (PHPT) from January 1st to December 31st 2009. Analyzed variables were: age, gender, familial antecedents of parathyroid pathology, clinical manifestations, pre-operative and post-operative serum levels of calcium, phosphorus, and parathyroid hormone levels, creatinine depuration, bone densitometry; diagnostic value of preoperative location study and histopathological report. Results: Ninety percent of patients were women with a mean age of 57 years. Nephrolithiasis, systemic arterial hypertension, and fatigue were the clinical manifestations most frequently associated with primary hyperparathyroidism. Ultrasonography and scintigraphy showed low sensitivity, low positive predictive value, moderate specificity, and moderate negative predictive value. Surgical approach was unilateral in 10 patients (47.5%), bilateral in 52.5%; therapeutic efficacy was of 85.7% for the first intervention, and of 100% for re-intervention. Complications were encountered in 4.7% of patients. Conclusion: In this series, patients with primary hyperparathyroidism presented nephrolithiasis more frequently, sensitivity of ultrasonography and scintigraphy in relation to specific location of glands was lower than reported. High surgical efficacy of the parathyroidectomy was achieved with low frequency of complications.
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The first implant of an endoluminal prosthesis in a human being as treatment for an abdominal aneurysm, was done by the Argentinian vascular surgeon JC Parodi, revolutionizing arterial surgery throughout the world. As a consequence of this event, many vascular surgery centers are concerned about clinical and experimental aspects of these interventions and even a inter-society committee for the study of Vascular Stents, was created. Interventional radiology is practiced in our country by radiologists. The main procedure done is angioplasty, with and without stent implantation in peripheral vessels. The exact role of vascular surgeons and interventional radiologists in the performance of these technique must be defined. Most reports agree that the best and safer situation is a close collaboration of both specialists