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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Reliability and validity of heart rate variability threshold assessment during an incremental shuttle-walk test in middle-aged and older adults

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Author(s):
Dourado, V. Z. [1] ; Guerra, R. L. F. [1]
Total Authors: 2
Affiliation:
[1] Univ Fed Sao Paulo, Dept Ciencias Movimento Humano, Lab Estudos Motricidade Humana, Santos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Brazilian Journal of Medical and Biological Research; v. 46, n. 2, p. 194-199, FEB 2013.
Web of Science Citations: 10
Abstract

Studies on the assessment of heart rate variability threshold (HRVT) during walking are scarce. We determined the reliability and validity of HRVT assessment during the incremental shuttle walk test (ISWT) in healthy subjects. Thirty-one participants aged 57 ± 9 years (17 females) performed 3 ISWTs. During the 1st and 2nd ISWTs, instantaneous heart rate variability was calculated every 30 s and HRVT was measured. Walking velocity at HRVT in these tests (WV-HRVT1 and WV-HRVT2) was registered. During the 3rd ISWT, physiological responses were assessed. The ventilatory equivalents were used to determine ventilatory threshold (VT) and the WV at VT (WV-VT) was recorded. The difference between WV-HRVT1 and WV-HRVT2 was not statistically significant (median and interquartile range = 4.8; 4.8 to 5.4 vs4.8; 4.2 to 5.4 km/h); the correlation between WV-HRVT1 and WV-HRVT2 was significant (r = 0.84); the intraclass correlation coefficient was high (0.92; 0.82 to 0.96), and the agreement was acceptable (-0.08 km/h; -0.92 to 0.87). The difference between WV-VT and WV-HRVT2 was not statistically significant (4.8; 4.8 to 5.4 vs 4.8; 4.2 to 5.4 km/h) and the agreement was acceptable (0.04 km/h; -1.28 to 1.36). HRVT assessment during walking is a reliable measure and permits the estimation of VT in adults. We suggest the use of the ISWT for the assessment of exercise capacity in middle-aged and older adults. (AU)

FAPESP's process: 07/08673-3 - SIX-MINUTE AND SHUTTLE WALK TESTS IN HEALTHY SUBJECTS AGED 40-80 YEARS
Grantee:Victor Zuniga Dourado
Support Opportunities: Regular Research Grants