2022 Volume 1 Issue 4 Pages 317-326
Purpose: This study examined respiratory and circulatory responses during low-intensity resistance exercise using a KAATSU device, which results in moderate blood flow restriction, in both healthy male adults and male patients with cardiovascular disease.
Methods: Healthy males (n = 10, 29.8 ± 7.0 years) and male patients in cardiac rehabilitation (n = 10, 76.9 ± 3.4 years) performed leg extensions (3 sets of 15 repetitions at low-intensity [20% of a 1-repetition maximum]) not using and using a KAATSU device. We measured expiratory gas and impedance cardiography before (baseline) and during exercise, as well as dyspnea and rate of perceived exertion (RPE) during knee extensor effort immediately after each set of repetitions.
Results: The patients were older than the healthy participants. At baseline, although heart rates and ventilatory equivalents did not differ between groups, oxygen uptake, carbon dioxide output, and left cardiac work index (LCWi) were lower in patients than in healthy participants. There were no GROUP × KAATSU interactions in terms of respiratory and circulatory responses during low-intensity resistance exercise. Dyspnea and RPE increased with exercise set repetitions and the KAATSU device augmented the RPE in both groups.
Conclusions: There were no patient-specific changes in respiratory and circulatory responses, dyspnea, and responses to knee extensor effort using the KAATSU device during low-intensity resistance exercise, despite patients being older than healthy participants and exhibiting a lower respiratory function and LCWi at baseline than them. These results suggest that low-intensity resistance exercise using a KAATSU device can be a safe and useful training method for cardiac rehabilitation.