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Relationship between double product break point, lactate threshold, and ventilatory threshold in cardiac patients
- Source :
- European Journal of Applied Physiology. 91:224-229
- Publication Year :
- 2004
- Publisher :
- Springer Science and Business Media LLC, 2004.
-
Abstract
- A double product break point (DPBP) occurs simultaneously with both ventilatory threshold (VT) and lactate threshold (LT) in normal subjects. We sought to determine whether a DPBP also occurs in cardiac patients and to investigate correlations between DPBP, VT and LT (study 1). We also evaluated a non-invasive DPBP measurement system that determined blood pressure automatically by the cuff method (study 2). Study 1 comprised 15 patients [8 men and 7 women, mean (SD) age 47.7 (11.1) years] who performed cardiopulmonary exercise tests on a cycle ergometer. The double product was defined as the product of heart rate and direct systolic blood pressure. Arterial blood samples were obtained for measurement of lactate, pyruvate, pH, and norepinephrine levels. VT was determined by gas analysis, and LT was determined as the lactate/pyruvate ratio. DPBPs were detected in all 15 patients. Double product slopes above the DPBP were significantly greater than those below the DPBP (286.2 vs 98.5/W, P
- Subjects :
- Adult
Male
medicine.medical_specialty
Anaerobic Threshold
Physiology
Statistics as Topic
Blood Pressure
Sensitivity and Specificity
Incremental exercise
Heart Rate
Physiology (medical)
Internal medicine
Heart rate
medicine
Humans
Orthopedics and Sports Medicine
Lactic Acid
business.industry
Lactate threshold
Public Health, Environmental and Occupational Health
Reproducibility of Results
General Medicine
Middle Aged
Blood pressure
Cardiovascular Diseases
Anesthesia
Exercise Test
Exercise intensity
Cardiology
Arterial blood
Female
Ventilatory threshold
business
Anaerobic exercise
Subjects
Details
- ISSN :
- 14396327 and 14396319
- Volume :
- 91
- Database :
- OpenAIRE
- Journal :
- European Journal of Applied Physiology
- Accession number :
- edsair.doi.dedup.....cd333a4075d9d4f5e8495f57f0a4064c