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  • Title: REPRODUCIBILITY OF PHYSIOLOGICAL VARIABLES OF THE SIX-MINUTE WALK TEST IN HEALTHY STUDENTS.
    Author: Keil PMR, Scalco JC, Wamosy RMG, Schivinski CIS.
    Journal: Rev Paul Pediatr; 2021; 39():e2019326. PubMed ID: 32876306.
    Abstract:
    OBJECTIVE: To verify the reproducibility of the six-minute walk test (6MWT) performance and its physiological variables in healthy students. METHODS: This is as prospective cross-sectional study. The sample consisted of healthy students aged 6-12 years old from public and private schools in the region of Florianópolis City, Santa Catarina State, (Southern Brazil). The medical state was considered according to the health records and scores on the International Study of Asthma and Allergies in Childhood (ISAAC) and the spirometric values of forced expiratory volume in the first second and forced vital capacity above 80% of what was predicted. Two 6MWTs were conducted with a 30-minute interval between them, following the recommendations from the American Thoracic Society. Physiologic variables were recorded using the portable telemetric gas analyzer K4b2 (Cosmed®, Italy). For analysis, the dyspnea index, the perception of effort and performance variables identified in both 6MWT were considered. Data distribution was verified with the Shapiro-Wilk test and statistical analysis included paired t-test or Wilcoxon test, and intraclass correlation coefficient (ICC). The significance level adopted was 5%. RESULTS: A total of 22 students with a mean age of 10.2±1.5 years participated in the study. The covered distance and the variation of oxygen consumption reproducibility between the two 6MWTs presented ICC=0.76 and ICC=0.86, respectively. There was also similar behavior of the physiological variables when comparing the two tests (p=0.001), especially the minute volume (MV), the oxygen consumption (VO2), and the carbon dioxide production (VCO2). CONCLUSIONS: The 6MWT showed reproducible values, both in performance and physiological parameters, in the healthy students analyzed. OBJETIVO:: Verificar a reprodutibilidade do desempenho e das variáveis fisiológicas do teste de caminhada de seis minutos (TC6) realizado por escolares saudáveis. MÉTODOS:: Estudo transversal prospectivo. A amostra foi composta de escolares saudáveis, entre 6 e 12 anos, provenientes de escolas públicas e privadas da Grande Florianópolis, SC, Brasil. A higidez foi controlada por meio do recordatório de saúde, do questionário International Study of Asthma and Allergies in Childhood (ISAAC) e dos valores espirométricos de volume expiratório forçado no primeiro segundo (VEF1) e capacidade vital forçada (CVF) acima de 80% do predito. Foram registradas as variáveis fisiológicas utilizando-se o analisador de gases telemétrico portátil K4b2 (Cosmed®, Itália), e, para análise, consideraram-se o índice de dispneia, a percepção de esforço e as variáveis de desempenho identificadas nos dois TC6. Verificou-se a distribuição dos dados pelo teste de Shapiro-Wilk, e a análise estatística incluiu: teste t de Student pareado, ou teste de Wilcoxon, e o coeficiente de correlação intraclasse (ICC). O nível de significância adotado foi de 5%. RESULTADOS:: Participaram 22 escolares com idade média de 10,2±1,5 anos. Identificou-se reprodutibilidade da distância percorrida e da variação do consumo de oxigênio entre os dois TC6, com ICC=0,76 e ICC=0,87, respectivamente. Houve similaridade no comportamento das variáveis fisiológicas na comparação entre os dois testes (p=0,001), destacando-se o volume minuto (VE), o consumo de oxigênio (VO2) e a produção de dióxido de carbono (VCO2). CONCLUSÕES:: O TC6 apresentou valores reprodutíveis tanto no desempenho como nos parâmetros fisiológicos nos escolares saudáveis estudados.
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