Exercise Induced Plasma Volume Expansion Lowers Cardiovascular Strain
NCT ID: NCT05800808
Last Updated: 2023-04-06
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
NA
8 participants
INTERVENTIONAL
2019-01-15
2022-12-08
Brief Summary
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Investigators first measured participant's response to exercise in hypoxia (simulated \~7,500 feet above sea level). The investigators then had participants either 1) undergo 1 bout of high intensity interval exercise or 2) undergo 1 bout of moderate, continuous exercise.
48 hours after the exercise, participants were again examined in hypoxia.
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Detailed Description
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The investigators hypothesized that a single HI session would increase plasma volume and attenuate cardiovascular strain during exercise in hypoxia, as evidenced by reductions in HR and elevations in SV and Q. Furthermore, the investigators hypothesized that these changes would contribute to a reduced time-to-completion in a 15 km, self-paced cycling TT.
Conditions
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Study Design
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RANDOMIZED
CROSSOVER
PREVENTION
NONE
Study Groups
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High Intensity Exercise
Vigorous cycling
High Intensity Intervals
8x4 min cycling bouts at 85% of VO2peak
Continuous Moderate Exercise
Leisurely cycling
Moderate Exercise
81 minutes of cycling at 50% VO2peak
Interventions
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High Intensity Intervals
8x4 min cycling bouts at 85% of VO2peak
Moderate Exercise
81 minutes of cycling at 50% VO2peak
Eligibility Criteria
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Inclusion Criteria
* Exercise at least 3 times/week for at least 30 minutes/day for the past 3 months.
Exclusion Criteria
* Resided at altitude greater than 2,500 meters for \>14 days.
* Cardiovascular or metabolic disease
18 Years
38 Years
MALE
Yes
Sponsors
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High Point University
OTHER
United States Army Research Institute of Environmental Medicine
FED
California Baptist University
OTHER
Responsible Party
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Locations
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California Baptist University
Riverside, California, United States
Countries
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References
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Alexander JK, Hartley LH, Modelski M, Grover RF. Reduction of stroke volume during exercise in man following ascent to 3,100 m altitude. J Appl Physiol. 1967 Dec;23(6):849-58. doi: 10.1152/jappl.1967.23.6.849. No abstract available.
Beidleman BA, Staab JE, Muza SR, Sawka MN. Quantitative model of hematologic and plasma volume responses after ascent and acclimation to moderate to high altitudes. Am J Physiol Regul Integr Comp Physiol. 2017 Feb 1;312(2):R265-R272. doi: 10.1152/ajpregu.00225.2016. Epub 2016 Dec 30.
Berger NJ, Campbell IT, Wilkerson DP, Jones AM. Influence of acute plasma volume expansion on VO2 kinetics, VO2 peak, and performance during high-intensity cycle exercise. J Appl Physiol (1985). 2006 Sep;101(3):707-14. doi: 10.1152/japplphysiol.00154.2006. Epub 2006 May 11.
Brothers MD, Wilber RL, Byrnes WC. Physical fitness and hematological changes during acclimatization to moderate altitude: a retrospective study. High Alt Med Biol. 2007 Fall;8(3):213-24. doi: 10.1089/ham.2007.8308.
Chapman RF, Laymon AS, Levine BD. Timing of arrival and pre-acclimatization strategies for the endurance athlete competing at moderate to high altitudes. High Alt Med Biol. 2013 Dec;14(4):319-24. doi: 10.1089/ham.2013.1022.
Chapman RF, Stager JM, Tanner DA, Stray-Gundersen J, Levine BD. Impairment of 3000-m run time at altitude is influenced by arterial oxyhemoglobin saturation. Med Sci Sports Exerc. 2011 Sep;43(9):1649-56. doi: 10.1249/MSS.0b013e318211bf45.
Chapman RF, Stickford JL, Levine BD. Altitude training considerations for the winter sport athlete. Exp Physiol. 2010 Mar;95(3):411-21. doi: 10.1113/expphysiol.2009.050377. Epub 2009 Oct 16.
Coles MG, Luetkemeier MJ. Sodium-facilitated hypervolemia, endurance performance, and thermoregulation. Int J Sports Med. 2005 Apr;26(3):182-7. doi: 10.1055/s-2004-820989.
Coyle EF, Hopper MK, Coggan AR. Maximal oxygen uptake relative to plasma volume expansion. Int J Sports Med. 1990 Apr;11(2):116-9. doi: 10.1055/s-2007-1024774.
Fortney SM, Wenger CB, Bove JR, Nadel ER. Effect of blood volume on forearm venous and cardiac stroke volume during exercise. J Appl Physiol Respir Environ Exerc Physiol. 1983 Sep;55(3):884-90. doi: 10.1152/jappl.1983.55.3.884.
Fulco CS, Muza SR, Beidleman BA, Demes R, Staab JE, Jones JE, Cymerman A. Effect of repeated normobaric hypoxia exposures during sleep on acute mountain sickness, exercise performance, and sleep during exposure to terrestrial altitude. Am J Physiol Regul Integr Comp Physiol. 2011 Feb;300(2):R428-36. doi: 10.1152/ajpregu.00633.2010. Epub 2010 Dec 1.
Fulco CS, Rock PB, Cymerman A. Maximal and submaximal exercise performance at altitude. Aviat Space Environ Med. 1998 Aug;69(8):793-801.
Gillen CM, Lee R, Mack GW, Tomaselli CM, Nishiyasu T, Nadel ER. Plasma volume expansion in humans after a single intense exercise protocol. J Appl Physiol (1985). 1991 Nov;71(5):1914-20. doi: 10.1152/jappl.1991.71.5.1914.
Gillen CM, Nishiyasu T, Langhans G, Weseman C, Mack GW, Nadel ER. Cardiovascular and renal function during exercise-induced blood volume expansion in men. J Appl Physiol (1985). 1994 Jun;76(6):2602-10. doi: 10.1152/jappl.1994.76.6.2602.
Greenleaf JE, Looft-Wilson R, Wisherd JL, Jackson CG, Fung PP, Ertl AC, Barnes PR, Jensen CD, Whittam JH. Hypervolemia in men from fluid ingestion at rest and during exercise. Aviat Space Environ Med. 1998 Apr;69(4):374-86.
Gorini Pereira F, Greenfield AM, Kuennen M, Gillum TL. Exercise induced plasma volume expansion lowers cardiovascular strain during 15-km cycling time-trial in acute normobaric hypoxia. PLoS One. 2024 Feb 2;19(2):e0297553. doi: 10.1371/journal.pone.0297553. eCollection 2024.
Other Identifiers
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Plasma Volume and Hypoxia
Identifier Type: -
Identifier Source: org_study_id
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