Cardiac function during exercise: a study of systolic time intervals during increasing and constant work rate exercise tests

Harðarson, Þórður; Spiro, S. G.; Curiel, R; Hl, Hahn

doi:10.1097/00000441-197311000-00004

Cited by 3 publications

(3 citation statements)

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“…Other investigators [23,53,54,73] who studied STI during increasing and constant work rate exercise tests, and during stepwise increasing hypoxia, found a progressive shortening of PEP with increasing work rate, and a decrease in PEP/ LVET with increasing hypoxia, respectively. HARDARSON et al [23] explained the shortening of PEP äs due to the significant increase in the (dp/dt)max which occurred on exercise.…”

Section: J Perinat Med 6 (1978)mentioning

confidence: 96%

See 1 more Smart Citation

Review article

Morgenstern¹,

Czerny²,

Schmidt³

et al. 1978

Journal of Perinatal Medicine

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Section: J Perinat Med 6 (1978)mentioning

confidence: 96%

“…HARDARSON et al [23] explained the shortening of PEP äs due to the significant increase in the (dp/dt)max which occurred on exercise. Further bu t smaller PEP shortening occurred with increasing exercise intensity.…”

Section: J Perinat Med 6 (1978)mentioning

confidence: 99%

Review article

Morgenstern¹,

Czerny²,

Schmidt³

et al. 1978

Journal of Perinatal Medicine

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“…The latter is generally obtained by hand-holding or strapping a funnel-shaped cup on the skin overlying the carotid artery in the neck and connecting the cup through air filled tubing to a pressure transducer. Other devices such as piezoelectric transducers, feeler pin displacement measured with a strain gauge, and pressure from a minimally inflated pediatric blood pressure cuff around the neck have also been used (3)(4)(5). All systems are easily employed at rest but may display large motion artifacts during exercise (5).…”

Section: Introductionmentioning

confidence: 99%

Measurement of systolic time intervals during exercise using inductive plethysmography

Jordan

Henke

Stone

et al. 1984

International Journal of Clinical Monitoring and Computing

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Measurement of systolic time intervals (STI) provides a noninvasive assessment of cardiac function in resting subjects. However, large motion artifacts often limit their application during exercise. To improve such measurements, we employed a new lightweight carotid arterial pulse transducer and minimized the artifacts by computerized signal averaging. The carotid pulse was recorded with an inductive plethysmographic transducer band (CIP) wrapped around the neck. STI derived from these measurements were compared to standard measurements from a funnel-shaped cup attached to the neck and connected to a pressure transducer (CUP) in 12 normal subjects at rest and with graded bicycle ergometry. To compare the techniques, CIP and CUP signals, together with the EKG and phonocardiogram, were connected separately to two microcomputer systems. The systems were triggered from the EKG and averaged the signals over 16 or 32 heart beats. Semi-automatic analysis of the averaged signals provided estimates of left ventricular ejection time (LVET), pre-ejection period (PEP) and electromechanical systole (QS2). Motion artifact levels of the unprocessed signals were similar with both CIP and CUP methods but were greatly reduced by signal averaging. All LVET values using CIP fell within 10% of CUP values. 85% of PEP values using CIP were within 20% of CUP values. Increasing exercise loads produced appropriate decreases in QS2, LVET, PEP and PEP/LVET consistent with increased myocardial contractility. The CIP proved comfortable to wear and did not require critical positioning as did the CUP. Measurement of STI complements exercise pulmonary testing with useful information of cardiac function.

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Exercise responses in aortic stenosis

James

1993

Progress in Pediatric Cardiology

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Cardiac function during exercise: a study of systolic time intervals during increasing and constant work rate exercise tests

Cited by 3 publications

References 0 publications

Review article

Review article

Measurement of systolic time intervals during exercise using inductive plethysmography

Exercise responses in aortic stenosis

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