Weight carrying effects on treadmill exercise response in persons without heart disease
| Autor: | T. Iwasaka, Mitsuo Inada, Tetsuro Sugiura, Yo Nagahama, Kazuya Takehana, Tadashi Hasegawa |
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| Rok vydání: | 1994 |
| Předmět: |
Adult
Male medicine.medical_specialty Time Factors Weight Lifting Heart disease Physiology Diastole Blood Pressure Coronary Disease Physical exercise Heart Rate Internal medicine Heart rate medicine Humans Exercise physiology Exercise business.industry General Medicine Middle Aged medicine.disease Blood pressure Circulatory system Exercise Test Cardiology Physical therapy business Venous return curve |
| Zdroj: | Clinical Physiology. 14:647-654 |
| ISSN: | 1365-2281 0144-5979 |
| DOI: | 10.1111/j.1475-097x.1994.tb00421.x |
| Popis: | To evaluate the effect of weight carrying on dynamic exercise response, 12 normal subjects were studied during treadmill exercise using ear densitography in two ways: (1) no weight, (2) 10 kg weight in one hand. Although there were no significant differences in diastolic time (DT), tension-time index [TTI: systolic blood pressure x heart rate (HR) x left ventricular ejection time (LVET)] was significantly higher throughout the weight carrying exercise compared to dynamic exercise. The amount of change (delta) in TTI was significantly larger in the initial stage (control to 1 min) of weight carrying exercise compared to dynamic exercise, but there were no significant differences in the later stages (1-3 min and 3-6 min). A prolongation in LVET was observed despite increasing HR during the first minute of exercise in both type of exercise, but LVET was longer at any given HR in weight carrying compared to dynamic exercise. Thus, despite higher TTI throughout the weight carrying exercise, delta TTI was larger only in the initial stage which was caused by prolongation of LVET resulting from disproportionate increase in venous return of early exercise. |
| Databáze: | OpenAIRE |
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