La revisión bibliográfica sistemática en fisiología La revisión bibliográfica sistemática en fisiología del ejercicio: recomendaciones prácticas. del ejercicio: recomendaciones prácticas.Palabras clave: Revisión, literatura, búsqueda, fisiología del ejercicio, ciencias de la actividad física y del deporte.
El triatlón es un deporte de resistencia que combina sucesivamente natación, ciclismo y carrera a pie. Como en otros deportes de estas características, la capacidad aeróbica máxima y la posibilidad de mantener una fracción alta del consumo de oxígeno máximo durante la competición son determinantes para el éxito. Ahora bien, el triatlón posee algunas peculiaridades, y la segunda transición es un momento clave, pues la capacidad para enlazar las etapas de ciclismo y carrera es determinante para el rendimiento, ya que la respuesta cardiorrespiratoria durante la carrera a pie de un triatlón se ve aumentada por diversos factores. Así, el objetivo del presente trabajo fue revisar las explicaciones que se han planteado para justificar la respuesta cardiorrespiratoria específica de la segunda transición del triatlón, comenzando por el "drift" cardiovascular y respiratorio, y terminando por los estudios que han abordado el entrenamiento específico de la segunda transición.Palabras Claves: triatlón; sucesión ciclismo-carrera; drift cardiovascular; coste metabólico; resistencia; fatiga respiratoria. Triahtlon is an endurance sport consisting of sequential swimming, cycling and running. As in other sports with similar characteristics, maximal aerobic capacity and the possibility to sustain high percentages of maximal oxygen uptake during competition are decisive to be successful. However, triathlon has some peculiarities, and the second transition is a key moment, because the ability to link cycling and running sectors is decisive for performance, as cardiorespiratory response during runing is increased by different factors. Thus, the aim of the present work was to review the explanations that have been considered to justify the specific cardiorespiratoy response during cycling-running succession in triathlon, from cardiovascular and ventilatory drift, to the studies that treat on specific traning adaptations during the second transition. R e s u m e nKey Words: triathlon, cycle-run succession; cardiovascular drift; oxygen cost; endurance; respiratory fatigue. A b s t r a c tRecibido el 12 de noviembre 2007; Aceptado el 14 de septiembre de 2008
ResumenEl entrenamiento con cargas es una actividad anaeróbica glucolítica intensa y se ha comprobado que el error en las estimaciones del gasto energético en esta actividad varía entre un 13 y un 30%. El principal objetivo de este trabajo es describir la contribución anaeróbica de energía en un circuito con cargas. Doce hombres (20-26 años) y diecisiete mujeres (18-29 años) estudiantes de Ciencias de la Actividad Física y del Deporte realizaron un entrenamiento en circuito de cargas a 6 intensidades diferentes (entre el 30% y 80% de su 15RM). Durante la totalidad de los circuitos se registró el gasto energético aeróbico por calorimetría indirecta, la frecuencia cardiaca con pulsómetro Polar® y la concentración de lactato en sangre capilar para medir la contribución anaeróbica. El incremento que produjo la energía anaeróbica se situó entre el 5,1% y un máximo del 13,5%, lo que hace evidente que medir o no la contribución anaeróbica en el entrenamiento en circuito puede provocar un error medio del 9,65%. Existen diferencias significativas (P< 0,05) entre el gasto energético aeróbico y total (aeróbi-co+anaeróbico) en todas las intensidades, en un circuito de entrenamiento con cargas a intensidades progresivas.Palabras clave: entrenamiento con cargas; gasto energético; lactato; circuito. AbstractResistance training is an intense anaerobic glycolytic activity and has been shown that estimates of energy expenditure in this activity turn out into an error that varies between 13 and 30%. The main aim of this paper is to describe the anaerobic energy contribution in circuit weight training. Twelve men (20-26 years) and seventeen women (18-29 years) students in Science of Physical Activity and Sport performed a circuit training at six different intensities (between 30% and 80% of 15RM). During all the circuits aerobic energy expenditure was registered by indirect calorimetry, heart rate with Polar® monitors and lactate concentration in capillary blood to measure the anaerobic contribution. The increased due to anaerobic energy was between 5,1%, and a maximum of 13,5% which clearly means that to measure or not the anaerobic contribution in circuit training can lead to an average error of 9,65%. There are significant differences (P <0,05) between aerobic energy expenditure and total (aerobic+anaerobic) at all the intensities, in a circuit weight training with progressive loads.
During circuit weight training (CWT), workloads, index of intensity as well as estimation of energy expenditure (EE) have been under estimated. The aim of this study was to describe and evaluate physiological variables and gender related differences, including intensity prediction and EE, during CWT at different intensities. Twenty six subjects were assessed in a CWT, fourteen men and twelve women. The CWT program was performed at six different intensities, 40%, 50%, 60%, 70%, 80% and 85% of 15RM. Seven exercises made up the circuit: sitting bench press, leg press, lat pull down, shoulder press, hamstring curl, biceps curl, and triceps cable push downs. A polar heart rate monitor and a portable metabolic system were used to measure heart rate (HR), intensity measured relative to the HR reserve, cardiorespiratory variables, EE and EE relative to muscle mass (EEMM). Differences between genders were observed at the following variables: HR, intensity measured relative to the HR reserve (in percentage), VO 2 , VCO 2 , V E , RER, aerobic EE and EEMM. The EE was significantly higher in men during the six intensities, but differences did not exist for EEMM from 70% to 85%. In addition HR, load and body weight were used to predict intensity and two gender specific equations were obtained for men and women [I (%) = 57.265 + 0.512HR -0.696HR max + 1.035 Load avg + 0.188 Body Weight (R 2 =0.92; SEE=4.9%) for men; I (%) = 4.036 + 0.412HR% + 1.667 Load avg (R2=0.79; SEE=7.7%) for women]. Thus, we conclude that gender related differences are present during CWT for EE, even when expressed relative to muscle mass, in addition HR, work load and body weight can estimate the intensity during CWT.
I. MARCO TEÓRICO1 1. Introducción. ÍNDICE DE ABREVIATURAS ABS Grupo de categoría absoluta CAD Grupo de categoría cadete CM Coste metabólico CON Carrera de control CPT Capacidad pulmonar total CRF Capacidad residual funcional CV Capacidad vital CVF Capacidad vital forzada DL CO Capacidad de difusión para el monóxido de carbono EMG Electromiograma
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