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Changes in plasma volume and baroreflex function following resistance exerciseThe dynamics of change in plasma volume (PV) and baroreflex responses have been reported over 24 h immediately following maximal cycle exercise. The purpose of this study was to determine if PV and baroreflex showed similar changes for 24 h after resistance exercise. Eight men were studied on 2 test days, 1 week apart. On 1 day, per cent change (% delta) in PV was estimated at 0,3, and 6 h after resistance exercise using haematocrit and haemoglobin. Baseline PV was measured 24 h after exercise using Evans blue dye. The carotid baroreceptor-cardiac reflex response was measured before, and 3, 6, 9, 12, and 24 h post-exercise. Each subject performed six sets of the bench press and leg press with 10 repetitions per set with a load that induced failure within each set. On a control day, the protocol was used without exercise. Plasma volume did not change during the control day. There was a 20% decrease in PV immediately post-exercise; the recovery of the PV was rapid and complete within 3 h. PV was 20% greater 24 h post-exercise than on the control day. There were no differences in any of the baroreflex measurements. Therefore, it is suggested that PV shifts may occur without altering baroreflex sensitivity.
Document ID
20050000445
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ploutz, L. L.
(Bionetics Corporation, Florida)
Tatro, D. L.
Dudley, G. A.
Convertino, V. A.
Date Acquired
August 22, 2013
Publication Date
July 1, 1993
Publication Information
Publication: Clinical physiology (Oxford, England)
Volume: 13
Issue: 4
ISSN: 0144-5979
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Other
Keywords
NASA Program Space Physiology and Countermeasures
NASA Discipline Number 14-10
NASA Center KSC
NASA Discipline Cardiopulmonary

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