Circuit weight training in cardiac patients: determining optimal workloads for safety and energy expenditure
| Autor: | Robert Kertzer, William B. Olney, Timothy J. Quinn, Neil B. Vroman, David W. DeGroot |
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| Rok vydání: | 1998 |
| Předmět: |
Male
medicine.medical_specialty Weight Lifting Strength training Coronary Disease Workload Electrocardiography Internal medicine Heart rate Medicine Humans Treadmill Exercise physiology Exercise Aged business.industry Rehabilitation Hemodynamics Repeated measures design VO2 max Middle Aged Intensity (physics) Blood pressure Treatment Outcome Cardiology Exercise Test Safety business Energy Metabolism Follow-Up Studies |
| Zdroj: | Journal of cardiopulmonary rehabilitation. 18(2) |
| ISSN: | 0883-9212 |
| Popis: | BACKGROUND While most studies suggest circuit weight training (CWT) to be safe in cardiac rehabilitation populations, few investigators have controlled variables known to impact CWT intensity. Therefore, the purposes of this study were to determine the energy cost and evaluate safety of cardiac patients while varying rest interval duration and lifting load in a CWT format. METHODS Nine male subjects with documented coronary artery disease had maximal oxygen uptake (VO2max), one-repetition maximum (1-RM), and body composition tested. In random order and on separate days, 4 CWT sessions using either 40% or 60% of the 1-RM, and either 30 or 60 seconds of rest between stations were completed. Energy cost, heart rate (HR), blood pressure (BP), and rate-pressure product (RPP) were measured. Data were analyzed with a repeated measures analysis of variance, and Tukey's post-hoc test was performed when significant results were found. The alpha level was set at < .05. RESULTS Subjects exercised at 25% to 32% of VO2max (58%-67% of HRmax) during CWT. The HR and RPP responses were lower during all CWT protocols than at 85% of the treadmill VO2max. No subject displayed any ST-segment depression or angina during CWT. The 40%-60-second protocol had an energy cost (2.98 kcal/min) that was lower (P < .05) than the other protocols (3.48-3.81 kcal/min). Increasing the lifting load resulted in increases (P < .05) in energy cost, and decreasing the rest interval increased energy cost only during the 40% 1-RM protocols. CONCLUSIONS Results indicate that CWT protocols of varied intensity are safe for cardiac patients when compared to treadmill exercise, and changes in rest interval duration and load can impact the energy cost. |
| Databáze: | OpenAIRE |
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