Use of Oxygen Pulse in Predicting Doppler-Derived Maximal Stroke Volume in Adolescents.

This study examined both of these issues in a cohort of 44 healthy adolescent males and females (ages 14-16 years) who performed routine progressive cycle exercise to exhaustion. Gas exchange variables were measured by standard open circuit techniques. Stroke volume at rest and during exercise was assessed by the Doppler ultrasound method. At peak exercise O2 pulse correlated closely with stroke volume (r=0.73) with a SEE of 12.6 mL·beat-1. Values of maximal O2 pulse in non-athletic boys and girls were 13.3 ± 2.5 and 11.0 ± 1.7 mL·beat-1, respectively. After the initial workload, a steady rise was observed in O2 pulse, entirely reflecting an increasing arterial venous oxygen difference, with a slope of approximately 4 ml/beat per 100 watts work load. The findings support the use of O2 pulse as a valid predictor of stroke volume during exercise in youth with a moderately high level of accuracy. PMID: 26186706 [PubMed - as supplied by publisher]
Source: Pediatric Exercise Science - Category: Pediatrics Authors: Tags: Pediatr Exerc Sci Source Type: research