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Correr con calor no es simplemente \"correr pasando más calor\": es una situación fisiológica radicalmente diferente que activa mecanismos de supervivencia, afecta al rendimiento y, si se gestiona mal, puede derivar en complicaciones graves.",{"type":21,"tag":30,"props":36,"children":37},{},[38],{"type":27,"value":39},"La buena noticia: estos mecanismos están bien documentados científicamente, y existen estrategias concretas para correr de forma eficaz —y segura— incluso cuando el termómetro supera los 25°C.",{"type":21,"tag":41,"props":42,"children":44},"h2",{"id":43},"_1-termorregulación-durante-el-ejercicio-qué-hace-tu-cuerpo",[45],{"type":27,"value":46},"1) Termorregulación durante el ejercicio: qué hace tu cuerpo",{"type":21,"tag":48,"props":49,"children":51},"h3",{"id":50},"la-doble-exigencia-térmica",[52],{"type":27,"value":53},"La doble exigencia térmica",{"type":21,"tag":30,"props":55,"children":56},{},[57,59,65],{"type":27,"value":58},"Durante el ejercicio, el cuerpo produce una cantidad considerable de calor. Un corredor de 70 kg a ritmo de maratón genera entre ",{"type":21,"tag":60,"props":61,"children":62},"strong",{},[63],{"type":27,"value":64},"700 y 1.000 vatios",{"type":27,"value":66}," de calor metabólico, de los cuales solo un 20-25% se convierte en movimiento. El resto debe ser disipado. Con frío (10-15°C) es manejable. Con calor y humedad, la situación es completamente diferente.",{"type":21,"tag":30,"props":68,"children":69},{},[70],{"type":27,"value":71},"El organismo se enfrenta a dos demandas contradictorias:",{"type":21,"tag":73,"props":74,"children":75},"ul",{},[76,89],{"type":21,"tag":77,"props":78,"children":79},"li",{},[80,82,87],{"type":27,"value":81},"Los ",{"type":21,"tag":60,"props":83,"children":84},{},[85],{"type":27,"value":86},"músculos activos",{"type":27,"value":88}," necesitan el máximo flujo sanguíneo para el oxígeno y los sustratos energéticos",{"type":21,"tag":77,"props":90,"children":91},{},[92,94,99],{"type":27,"value":93},"La ",{"type":21,"tag":60,"props":95,"children":96},{},[97],{"type":27,"value":98},"piel",{"type":27,"value":100}," también necesita un flujo máximo para transferir el calor hacia el exterior",{"type":21,"tag":30,"props":102,"children":103},{},[104],{"type":27,"value":105},"Ambas demandas compiten por el mismo recurso: tu volumen sanguíneo.",{"type":21,"tag":48,"props":107,"children":109},{"id":108},"la-sudoración-el-principal-mecanismo-de-enfriamiento",[110],{"type":27,"value":111},"La sudoración: el principal mecanismo de enfriamiento",{"type":21,"tag":30,"props":113,"children":114},{},[115,116,121],{"type":27,"value":93},{"type":21,"tag":60,"props":117,"children":118},{},[119],{"type":27,"value":120},"sudoración",{"type":27,"value":122}," es el principal mecanismo de termorregulación humana. Cuando el sudor se evapora en la piel, se lleva consigo una gran cantidad de energía térmica (aproximadamente 580 kcal por litro de agua evaporada).",{"type":21,"tag":30,"props":124,"children":125},{},[126,128,133],{"type":27,"value":127},"Un corredor puede sudar entre ",{"type":21,"tag":60,"props":129,"children":130},{},[131],{"type":27,"value":132},"0,5 y 2,5 litros por hora",{"type":27,"value":134}," dependiendo de:",{"type":21,"tag":73,"props":136,"children":137},{},[138,143,148,153],{"type":21,"tag":77,"props":139,"children":140},{},[141],{"type":27,"value":142},"La intensidad del esfuerzo",{"type":21,"tag":77,"props":144,"children":145},{},[146],{"type":27,"value":147},"La temperatura ambiental y la humedad relativa",{"type":21,"tag":77,"props":149,"children":150},{},[151],{"type":27,"value":152},"El nivel de entrenamiento y aclimatación",{"type":21,"tag":77,"props":154,"children":155},{},[156],{"type":27,"value":157},"La morfología corporal",{"type":21,"tag":30,"props":159,"children":160},{},[161,166],{"type":21,"tag":60,"props":162,"children":163},{},[164],{"type":27,"value":165},"La humedad es el mayor enemigo.",{"type":27,"value":167}," La eficacia de la sudoración depende por completo de la evaporación. Con 35°C secos, el sudor se evapora fácilmente. Con 28°C y 80% de humedad, la evaporación es muy limitada: el sudor gotea pero apenas refresca. Por eso el índice de calor húmedo es más predictivo del peligro que la temperatura simple.",{"type":21,"tag":48,"props":169,"children":171},{"id":170},"vasodilatación-cutánea-redirigir-la-sangre-hacia-la-piel",[172],{"type":27,"value":173},"Vasodilatación cutánea: redirigir la sangre hacia la piel",{"type":21,"tag":30,"props":175,"children":176},{},[177,179,184,186,191],{"type":27,"value":178},"Simultáneamente, el cuerpo redistribuye la sangre hacia la periferia. El flujo sanguíneo cutáneo pasa de unos ",{"type":21,"tag":60,"props":180,"children":181},{},[182],{"type":27,"value":183},"0,5 L\u002Fmin en reposo",{"type":27,"value":185}," a ",{"type":21,"tag":60,"props":187,"children":188},{},[189],{"type":27,"value":190},"7-8 L\u002Fmin durante un esfuerzo intenso con calor",{"type":27,"value":192},". Esta vasodilatación masiva lleva el calor del núcleo a la superficie cutánea donde puede irradiarse.",{"type":21,"tag":30,"props":194,"children":195},{},[196,198,203],{"type":27,"value":197},"La consecuencia directa: menos sangre disponible para los músculos y menor retorno al corazón (menor volumen sistólico). Para compensar, la ",{"type":21,"tag":60,"props":199,"children":200},{},[201],{"type":27,"value":202},"frecuencia cardíaca aumenta",{"type":27,"value":204}," —a veces 10-20 lpm más que en un día fresco al mismo ritmo.",{"type":21,"tag":48,"props":206,"children":208},{"id":207},"la-deriva-cardiovascular",[209],{"type":27,"value":210},"La deriva cardiovascular",{"type":21,"tag":30,"props":212,"children":213},{},[214,216,221],{"type":27,"value":215},"Este fenómeno se llama ",{"type":21,"tag":60,"props":217,"children":218},{},[219],{"type":27,"value":220},"deriva cardiovascular",{"type":27,"value":222},". 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Los estudios muestran que tras 60 minutos de ejercicio en calor, la FC puede derivar 15-25 lpm por encima del valor inicial, sin ningún cambio de ritmo.",{"type":21,"tag":30,"props":224,"children":225},{},[226],{"type":27,"value":227},"Para los corredores con pulsómetro, esto significa que una sesión en zona 2 a 30°C rápidamente parece zona 3 o 4.",{"type":21,"tag":41,"props":229,"children":231},{"id":230},"_2-impacto-en-el-rendimiento-los-datos-clave",[232],{"type":27,"value":233},"2) Impacto en el rendimiento: los datos clave",{"type":21,"tag":48,"props":235,"children":237},{"id":236},"caída-del-vo2máx-por-grado-de-calor",[238],{"type":27,"value":239},"Caída del VO2máx por grado de calor",{"type":21,"tag":30,"props":241,"children":242},{},[243,245,250,252,257],{"type":27,"value":244},"La investigación es contundente: ",{"type":21,"tag":60,"props":246,"children":247},{},[248],{"type":27,"value":249},"el calor reduce significativamente el rendimiento aeróbico",{"type":27,"value":251},". 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La regla de oro: ",{"type":21,"tag":60,"props":389,"children":390},{},[391],{"type":27,"value":392},"no esperar a tener sed para beber",{"type":27,"value":394},", ya que la sed solo aparece a partir del 1-2% de deshidratación.",{"type":21,"tag":48,"props":396,"children":398},{"id":397},"el-esfuerzo-percibido-aumenta-independientemente-del-rendimiento",[399],{"type":27,"value":400},"El esfuerzo percibido aumenta independientemente del rendimiento",{"type":21,"tag":30,"props":402,"children":403},{},[404,406,411],{"type":27,"value":405},"Incluso si reduces el ritmo, tu RPE (Esfuerzo Percibido) será mayor con calor. En verano, ",{"type":21,"tag":60,"props":407,"children":408},{},[409],{"type":27,"value":410},"correr por RPE en lugar de por ritmo objetivo",{"type":27,"value":412}," es la estrategia más inteligente. Un RPE \"cómodo\" en pleno verano puede corresponder a un ritmo 30-90 seg\u002Fkm más lento que en invierno —y es completamente normal.",{"type":21,"tag":41,"props":414,"children":416},{"id":415},"_3-aclimatación-térmica-adaptarse-en-10-14-días",[417],{"type":27,"value":418},"3) Aclimatación térmica: adaptarse en 10-14 días",{"type":21,"tag":48,"props":420,"children":422},{"id":421},"adaptaciones-fisiológicas-documentadas",[423],{"type":27,"value":424},"Adaptaciones fisiológicas documentadas",{"type":21,"tag":30,"props":426,"children":427},{},[428,430,435],{"type":27,"value":429},"La aclimatación térmica produce cambios notables en ",{"type":21,"tag":60,"props":431,"children":432},{},[433],{"type":27,"value":434},"10-14 días",{"type":27,"value":436}," de exposición diaria al calor durante el ejercicio:",{"type":21,"tag":30,"props":438,"children":439},{},[440,445],{"type":21,"tag":60,"props":441,"children":442},{},[443],{"type":27,"value":444},"1. 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