<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1659-097X</journal-id>
<journal-title><![CDATA[MHSalud]]></journal-title>
<abbrev-journal-title><![CDATA[MHSalud]]></abbrev-journal-title>
<issn>1659-097X</issn>
<publisher>
<publisher-name><![CDATA[Escuela de Ciencias del Movimiento Humano y Calidad de Vida, Universidad Nacional]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-097X2023000100113</article-id>
<article-id pub-id-type="doi">10.15359/mhs.20-1.11</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Biochemical and Physiological Responses in Sedentary Subjects During the Evaluation of Maximum Oxygen Uptake]]></article-title>
<article-title xml:lang="es"><![CDATA[Respuestas funcionales durante una prueba de consumo máximo de oxígeno en sujetos sedentarios]]></article-title>
<article-title xml:lang="pt"><![CDATA[Respostas funcionais durante um teste de absorção máxima de oxigênio em indivíduos sedentários]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lozada Medina]]></surname>
<given-names><![CDATA[Jesús León]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Padilla Alvarado]]></surname>
<given-names><![CDATA[José Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortina Núñez]]></surname>
<given-names><![CDATA[Manuel de Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Corporación Universitaria del Caribe  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Experimental de los Llanos Occidentales &#8220;Ezequiel Zamora&#8221;  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Córdoba  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<volume>20</volume>
<numero>1</numero>
<fpage>113</fpage>
<lpage>126</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-097X2023000100113&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-097X2023000100113&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-097X2023000100113&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  The use of incremental exercise tests (IET) to evaluate the individual&#8217;s acute responses is an essential tool in Physical Activity Science.  Objective:  This paper aims to analyze the behavior between biochemical and physiological variables as aerobic-anaerobic transition indicators during two incremental exercise tests, which measure the maximum oxygen uptake in healthy subjects.  Methodology:  The sample consisted of two individuals, who were thirty-three and twenty-five years old, respectively. During the execution of the tests, the following materials and tools were used: a portable glucometer, a portable lactometer, reactive tapes, a treadmill, a stationary Cycle Ergometer Monark®, a heart rate monitor Polar®, a gas analyzer, software Breeze®, a computer, tools for recording data, and a pencil.  Results:  the high inverse correlation between the Glycemic index and VO2 (r: -0,853) and the Glycemic and CO2 (r: -0,851) are notable. Moreover, the detection of thresholds for each subject through blood lactate invasive and non-invasive methods, such as heart rate (HR), is also shown.  Conclusion:  A clear explanation of Respiratory Quotient (RQ) behavior is given during the Cycle-ergometer test, concluding that this type of protocol is safe for the group under study and that the validity of the results is in accordance with theoretical expectations.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  La ejecución de pruebas físicas incrementales para evaluar las respuestas agudas del individuo, representa una herramienta fundamental en el área de las ciencias de la actividad física.  Objetivo:  En este sentido, el presente trabajo tiene como objetivo el análisis del comportamiento entre variables bioquímicas y fisiológicas como indicadores de la transición aerobio-anaeróbica en la ejecución de dos test incrementales que miden el consumo máximo de oxígeno, en sujetos sedentarios.  Metodología:  La muestra se conformó por dos individuos, los cuales presentan edades de treinta y tres y veinticinco años, respectivamente. En el desarrollo de la prueba se utilizaron los siguientes materiales e instrumentos: un glucómetro portátil, un lactómetro portátil, cintas reactivas, treadmill, cicloergomertro Monark ®, pulsometro marca polar ®, analizador de gases, software Breeze ®, computador, instrumentos de registro de datos y lápiz.  Resultados:  destacan la alta correlación inversa presente entre los valores de glicemia y VO2 (r: -0,853), así como Glicemia y CO2 (r: -0,851) del mismo modo se muestra la detección de los Umbrales para cada sujeto mediante métodos invasivos del lactacidemia y no invasivos como la frecuencia cardíaca.  Conclusión:  También se ejecuta una explicación clara del comportamiento del cociente respiratorio en la prueba ejecutada con el cicloergómetro, concluyendo que este tipo de protocolos son seguros para el grupo en estudio y la validez de los resultados es acorde con las expectativas teóricas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo:  Introdução:  A execução de testes físicos incrementais para avaliar as respostas agudas do indivíduo representa uma ferramenta fundamental na área das ciências da atividade física.  Objetivo:  Neste sentido, o presente trabalho visa analisar o comportamento entre as variáveis bioquímicas e fisiológicas como indicadores da transição aeróbico-anaeróbica na execução de dois testes incrementais que medem o consumo máximo de oxigênio em sujeitos sedentários.  Metodologia:  A amostra consistiu de dois indivíduos, com trinta e três e vinte e cinco anos de idade, respectivamente. Os seguintes materiais e instrumentos foram utilizados no desenvolvimento do teste: um glicosímetro portátil, um lactômetro portátil, tiras de teste, esteira, cicloergômetro Monark®, pulsômetro polar®, analisador de gás, software Breeze®, computador, instrumentos de registro de dados e lápis.  Resultados:  A alta correlação inversa entre glicemia e VO2 (r: -0,853), assim como glicemia e CO2 (r: #0,851) e a detecção dos limiares para cada sujeito usando métodos invasivos como lactacidemia e métodos não-invasivos como a frequência cardíaca.  Conclusão:  Uma explicação clara do comportamento do quociente respiratório no teste executado com o cicloergômetro também é executada, concluindo que este tipo de protocolos são seguros para o grupo em estudo e a validade dos resultados está de acordo com as expectativas teóricas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[lactic acid]]></kwd>
<kwd lng="en"><![CDATA[aerobic exercise]]></kwd>
<kwd lng="en"><![CDATA[heart rate]]></kwd>
<kwd lng="en"><![CDATA[blood glucose]]></kwd>
<kwd lng="es"><![CDATA[ácido láctico]]></kwd>
<kwd lng="es"><![CDATA[ejercicio aeróbico]]></kwd>
<kwd lng="es"><![CDATA[frecuencia cardiaca]]></kwd>
<kwd lng="es"><![CDATA[glucosa en sangre]]></kwd>
<kwd lng="pt"><![CDATA[ácido láctico]]></kwd>
<kwd lng="pt"><![CDATA[exercício aeróbico]]></kwd>
<kwd lng="pt"><![CDATA[frequência cardíaca]]></kwd>
<kwd lng="pt"><![CDATA[glicose no sangue]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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