Key result
Heart rate recovery indices after a treadmill exercise test demonstrated excellent short-term reproducibility in healthy volunteers, with an intraclass correlation coefficient of 0.88 for the 1st-minute recovery.
Why the study?
Does heart rate recovery after a treadmill exercise test have short-term test-retest stability in healthy volunteers?
Observational (n=52)
No
Does heart rate recovery after a treadmill exercise test have short-term test-retest stability in healthy volunteers?
Effect estimate: ICC 0.88 (95% CI 0.81-0.92)
Absolute Event Rate: 33.5% vs 33.8%
p-value: p=<0.001
Maximal heart rates and heart rate recovery up to 5 minutes after a treadmill exercise test show strong short-term reproducibility in healthy individuals.
Supports short-term stability of heart rate recovery for repeated testing in healthy volunteers; leaves open its reliability and prognostic role in patients.
BACKGROUND: Although predictive value of heart rate recovery (HRR) has been tested in large populations, the reproducibility of HRR in treadmill exercise test has not been assessed prospectively. This prospective study examined whether HRR index has test-retest stability in the short term. METHODS: A total of 52 healthy volunteers without cardiovascular risk factors (mean age, 30 ± 10 years, 30 females) underwent standardized graded treadmill exercise test, and the test was repeated on the 7th and the 30th days. The subjects' maximal heart rates and the decrease of heart rate from the peak exercise level to the level of 1, 2, 3, 4, and 5 minutes after the termination of the exercise were examined on each test, and heart rates for each minute from the first, second, and third tests were compared for each individual. RESULTS: The maximal heart rates on the 1st, 7th, and the 30th days were 179 ± 11, 177 ± 10, 178 ± 10 beats/min, respectively [P = 0.07, intraclass correlation coefficient (ICC) = 0.92], and the 1st minute HRR indices after peak exercise were 33 ± 10, 33 ± 10, 33 ± 11, respectively (P = 0.66, ICC = 0.88). There was no statistical difference in the 2nd, 3rd, 4th, and 5th minute heart rates of the recovery phase among the 1st, 7th, and 30th day treadmill exercise tests, either. CONCLUSION: Maximal heart rates and the decline of heart rate to the 5th minute on recovery phase after treadmill exercise test have short-term reproducibility.
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Tülümen et al. (2011) conducted an observational in Healthy volunteers (n=52). Treadmill exercise test vs. Test-retest comparison (1st, 7th, and 30th days) was evaluated on Reproducibility of 1st minute heart rate recovery (HRR1) index (ICC 0.88, 95% CI 0.81-0.92, p=<0.001). Heart rate recovery indices after a treadmill exercise test demonstrated excellent short-term reproducibility in healthy volunteers, with an intraclass correlation coefficient of 0.88 for the 1st-minute recovery.