A Six-Minute Walk Test: Oxygen Uptake and Distance Predicted

Prueba de Caminata de Seis Minutos: Consumo de Oxígeno y Distancia Predicha

Teste de caminhada de seis minutos: consumo de oxigênio e distância prevista

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Background: Maximum oxygen consumption is an indicator of cardiorespiratory fitness. Aim: The purpose was, first, to relate and compare the V̇O₂max as the dependent variable with the estimated distance in the six-minute walk test (SMWT) as the independent variable in university students and, secondly, to relate the distance (dependent) with demographic and anthropometric variables (independents).

Methodology: A correlational, descriptive, and quantitative study with a non-experimental design was conducted on 110 university students. In the study, basic anthropometry and vital signs were measured. A direct method of V̇O₂max (Bruce test) on a treadmill was applied. Then, the distance covered in the SMWT was evaluated with two equations available in the scientific literature. Differences between men and women were measured in the tests, the correlation between the distances estimated with V̇O₂max and anthropometric variables, and repeated ANOVA measurement tests between V̇O₂max and estimated distance were analyzed with the SPSS v.22 program (p<0.05). Results: Significant correlations were found between V̇O₂max and estimated distances (p<0.05) in the total sample, men and women, and in some cases, the distance correlated with gender, age, weight, height, and BMI (p<0.05). However, there were differences between V̇O₂max and distances estimated in the SMWT (p<0.001).

Conclusions: The V̇O₂max measurement method is different from the distance prediction equations, although they have a significant relationship.

Keywords: Oxygen consumption; walking; students

	Total (n=110)				Male (n=54)				Female (n=56)				p-value ^a
Variables	Mean	Median	SD	IR	Mean	Median	SD	IR	Mean	Median	SD	IR
Age (years)	21.9	21.6	2.1	2.3	22	21.8	2.5	2.7	21.8	21.5	1.6	2.1	0.606^b
Weight (kg)	67.2	66.1	10.9	13.9	72.7	71.8	9.5	13.4	61.9	61.9	9.4	15.4	<0.001^b
Height (m)	1.66	1.66	0.09	0.15	1.73	1.74	0.06	0.08	1.6	1.59	0.06	0.09	<0.001^b
BMI (kg·m^-2)	24.3	24	3.1	3.9	24.3	23.8	3	3.8	24.2	24.1	3.3	4.6	0.93^b
SBP rest (mmHg)	116.1	113.5	14.1	16	123.1	122	12.4	18	109.4	110	12.3	14	<0.001^b
DBP rest (mmHg)	71.3	71	9.7	11	71.6	71	8.8	11	71	71.5	10.5	12	0.735^b
HR rest (beats·min^-1)	75.4	75	10.7	15	72	74	9	13	78	78	11	15	0.002^b
Saturation O₂ rest (%)	98.4	99	2.1	0	98.6	99	1.1	0	98.2	99	2.8	0	0.771^c

GXT
V̇O₂max (ml·kg·min^-1)	40.1	40.1	7.9	10.1	44.7	44	7	9.6	35.7	35.8	6	8.9	<0.001^b
V̇O₂max (L·min^-1)	2.7	2.6	0.7	1.2	3.2	3.3	0.5	0.7	2.2	2.1	0.4	0.6	<0.001^b
HR (beats·min^-1)	193	193	8	10	195.2	194.5	7.5	12	191.2	193	8.4	9	0.01^b
HR (%)	97.5	97.7	4.1	4.3	98.6	98.2	3.7	5.7	96.5	97.1	4.1	3.6	0.006^b
RER	1.19	1.19	0.06	0.05	1.20	1.2	0.05	0.04	1.17	1.18	0.06	0.06	0.01^c
RPE	16	15	2	2	16	15.5	2	3	16	15	2	2	0.829^c

SMWT (Britto et al., 2013), distance (m)	679.4	676.5	31.2	51	703.7	708	21.2	28	655.9	658.5	18.7	23	<0.001^b
SMWT (Chetta et al., 2006), distance (m)	645.3	637.5	29.3	55	673.4	673.5	10.3	11	618.3	618.5	8.8	12	<0.001^b

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None Universidad Nacional, Campus Benjamín Núñez, Escuela Ciencias del Movimiento Humano y Calidad de Vida, Heredia, Heredia, Costa Rica, Heredia, Costa Rica, CR, 86-3000, 2562-4779, 2261-0032 - E-mail: revistamhsalud@una.cr

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[TFN1] Note.^adifferences between male and female; ^bStudent-T test; BMI: body mass index; ^cU Mann-Whitney test; DBP: diastolic blood pressure; HR: heart rate; IR: interquartile range; RER: respiratory exchange ratio; RPE: rating of perceived exertion; SBP: systolic blood pressure; SD: standard deviation; SMWT: Six-Minute Walk Test.