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Effects of posture on exercise performance - Measurement by systolic time intervals.Because posture significantly influences cardiac performance, the effects of moderate supine and upright ergometer exercise were compared on the basis of proportional (+37%) rate increments over resting control. Supine exercise produced significant decreases in left ventricular ejection time (LVET), pre-ejection period (PEP), and isovolumic contraction time (IVCT). Ejection time index (ETI) and corrected ejection time (LVETc) did not change significantly. Upright exercise produced greater decreases in PEP and LVET, but despite the rate increase there was no change in LVET, which resulted in sharp increases in ETI and LVETc. The discordant directional effects on LVET and its rate-correcting indices between the two postures were consistent with hemodynamic studies demonstrating lack of stroke volume change during supine exercise and increased stroke volume over control during light to moderate upright exercise.
Document ID
19730053458
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Spodick, D. H.
(Lemuel Shattuck Hospital Boston, Mass., United States)
Quarry-Pigott, V. M.
(Lemuel Shattuck Hospital; Tufts University Boston, Mass., United States)
Date Acquired
August 7, 2013
Publication Date
July 1, 1973
Publication Information
Publication: Circulation
Volume: 48
Subject Category
Biosciences
Accession Number
73A38260
Funding Number(s)
CONTRACT_GRANT: NGR-22-012-006
Distribution Limits
Public
Copyright
Other

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