O incremental shuttle walking test exige um esforço máximo em idosos hipertensos?

Abstract

The Incremental Shuttle Walking Test (ISWT) is a simple and reliable test that has been increasingly used, as it presents a moderate correlation with maximum oxygen consumption (VO2max). Objective: To evaluate whether ISWT requires maximal effort in hypertensive elderly people. Methodology: Cross-sectional study with 30 individuals, with a mean age of 69.5 ±7.3 years, predominantly female (68%). The ISWT was performed on a flat, 10-meter track, with an initial speed of 0.5 m/s, increasing 0.17 m/s every minute. 15 stages were adopted with the intention of avoiding the ceiling effect. The ISWT was interrupted if the volunteer did not reach the cone once or due to any other reported symptom. Blood pressure (BP) was measured using the oscillometric technique (Omrom HBP1110). The perception of dyspnea and fatigue of the lower limbs was assessed using the modified Borg Scale (CR10) and were assessed immediately before and after the tests. Heart rate (HR) was monitored using a heart rate monitor (Polar H10) throughout the test, expressed as a percentage of maximum heart rate (HRmax), estimated by the Tanaka equation (208 – 0.7 x age). Results: The ISWT was within normal limits, no participant interrupted the test due to showing any symptoms and no adverse effects were reported at the end. The majority of individuals (52%) reached 85% of the predicted HRmax at the end of the test. The average distance covered in the ISWT was 545.08 ± 183.24 meters, exceeding 25% of the predicted distance. Conclusion: The ISWT is a valid, reliable and safe walking test that imposes maximal effort in hypertensive elderly people.