Acute Hematological Responses to a Maximal Incremental Treadmill Test

Abstract

ARTIGO ORIGINAL | ORIGINAL ARTICLE RESUMOO presente estudo teve como objetivo estudar as respostas hematológicas agudas em indivíduos submetidos a um teste cardiorrespiratório incremental máximo em esteira sem inclinação. Foram analisados 23 indivíduos, 12 homens e 11 mulheres, com idade média de 30,2 (± 8,4) anos, massa corporal média de 68,1 (±18,1) kg, estatura média de 170,2 (±9,8) cm, e IMC médio de 23,2 (±3,7) kg/m², fisicamente ativos, com prática mínima de 3,5 horas semanais de exercício há pelo menos 6 meses. Os sujeitos foram submetidos a um teste incremental máximo em esteira, com recolha de sangue venoso para análise antes e imediatamente após o término do teste. Utilizou-se o teste de Wilcoxon para análise das variáveis pré e pós teste. Adotou-se p < 0,05 como nível de significância. Houve elevação significativa na contagem de leucócitos (69,23%; p = 0,005), linfócitos (17,56%; p = 0,043), monócitos (85,41%; p = 0,012) e granulócitos (28,21%; p = 0,011). Foi igualmente observado um aumento significativo, nas hemácias (3,42%; p = 0,042), no hematócrito (5,39%; p = 0,038) e na hemoglobina (5,58%; p = 0,013). Com o presente estudo, concluímos que a realização de um teste máximo de corrida em esteira pode elevar significativamente as concentrações sanguíneas de leucócitos e respetivas subpopulações, assim como de hemácias e hemoglobina. Palavras-chave: Células Sanguíneas, Teste de Esforço, Contagem de Leucócitos ABSTRACTThe present study aimed to study acute hematologic responses in individuals undergoing a cardiopulmonary maximum incremental treadmill test without inclination. Were analyzed 23 individuals, 12 men and 11 women, with a mean age of 30.2 (± 8.4) years, mean weight of 68.1 (± 18.1) kg, mean height of 170.2 (± 9.8) cm, and mean BMI of 23.2 (±3.7) kg/m², physically active, with a minimum practice of 3.5 hours per week of exercise for at least 6 months. The subjects were submitted to a maximal incremental treadmill test, with venous blood collection for analysis before and immediately after completion of the test. Was used Wilcoxon test for analysis of pre and post test variables. Was adopted p < 0.05 as significance level. There was a significant increase in leukocyte count (69.23%; p = 0.005), lymphocytes (17.56%; p = 0.043), monocytes (85.41%; p = 0.012) and granulocytes (28.21%; p = 0.011). It was also observed a significant increase in erythrocytes (3,42%; p = 0,042), hematocrit (5.39%; p = 0.038) and hemoglobin (5.58%; p = 0.013). With this study, was concluded that performing a maximal test of treadmill running can significantly raise blood levels of leukocytes and respective sub-populations, as well as red blood cells and hemoglobin.

Acute metabolic response to fasted and postprandial exercise

“… 20 Adams 20 argued that glucose production by the liver is stimulated by catecholamines after 2 hours of exercise. However, Lima et al 16 showed a significant increase in glucose concentration after the maximal test without gradient, with an average of 8.46 minutes.…”

“…It is understood that, with this protocol, the muscle fatigue caused by inclinations on the treadmill was avoided, favoring the execution of the maximal test, with no underestimation of it. In this sense, stages of 1-minute duration promoted quick increments and a higher VO 2 , as proposed by Machado et al 15 This protocol was first used by Lima et al 16 The assessment was interrupted whenever the individual demonstrated volitional exhaustion or the maximum heart rate estimated by the formula 220 minus age, proposed by Karvonen 17 was achieved. To estimate VO 2 max, we used Ventilometer VO 2 ProFitness (CEFISE Biotecnologia Esportiva, Nova Odessa, Brazil).…”