Ischemic preconditioning does not improve peak exercise capacity at sea level or simulated high altitude in trained male cyclists

Elizabeth A. Hittinger, Jennifer L. Maher, Mark S Nash, Arlette Perry, Joseph Signorile, Jochen Kressler, Kevin Jacobs

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Ischemic preconditioning (IPC) may improve blood flow and oxygen delivery to tissues, including skeletal muscle, and has the potential to improve intense aerobic exercise performance, especially that which results in arterial hypoxemia. The aim of the study was to determine the effects of IPC of the legs on peak exercise capacity (Wpeak), submaximal and peak cardiovascular hemodynamics, and peripheral capillary oxygen saturation (SpO2) in trained males at sea level (SL) and simulated high altitude (HA; 13.3% FIO2, ∼3650 m). Fifteen highly trained male cyclists and triathletes completed 2 Wpeak tests (SL and HA) and 4 experimental exercise trials (10 min at 55% altitude-specific Wpeak then increasing by 30Wevery 2 min until exhaustion) with and without IPC. HA resulted in significant arterial hypoxemia during exercise compared with SL (73% ± 6% vs. 93% ± 4% SpO2, p < 0.001) that was associated with 21% lower Wpeak values. IPC did not significantly improve Wpeak at SL or HA. Additionally, IPC failed to improve cardiovascular hemodynamics or SpO2 during submaximal exercise or at Wpeak. In conclusion, IPC performed 45 min prior to exercise does not improve Wpeak or systemic oxygen delivery during submaximal or peak exercise at SL or HA. Future studies must examine the influence of IPC on local factors, such as working limb blood flow, oxygen delivery, and arteriovenous oxygen difference as well as whether the effectiveness of IPC is altered by the volume of muscle made ischemic, the timing prior to exercise, and high altitude acclimatization.

Original languageEnglish
Pages (from-to)65-71
Number of pages7
JournalApplied Physiology, Nutrition and Metabolism
Volume40
Issue number1
DOIs
StatePublished - Jan 1 2015

Fingerprint

Ischemic Preconditioning
Oceans and Seas
Oxygen
Hemodynamics
Acclimatization
Leg
Skeletal Muscle
Extremities
Exercise
Muscles

Keywords

  • Cardiac output
  • Exertion
  • Hypoxia
  • Occlusion
  • Peripheral capillary oxygen saturation
  • Reperfusion

ASJC Scopus subject areas

  • Physiology
  • Endocrinology, Diabetes and Metabolism
  • Nutrition and Dietetics
  • Physiology (medical)

Cite this

Ischemic preconditioning does not improve peak exercise capacity at sea level or simulated high altitude in trained male cyclists. / Hittinger, Elizabeth A.; Maher, Jennifer L.; Nash, Mark S; Perry, Arlette; Signorile, Joseph; Kressler, Jochen; Jacobs, Kevin.

In: Applied Physiology, Nutrition and Metabolism, Vol. 40, No. 1, 01.01.2015, p. 65-71.

Research output: Contribution to journalArticle

@article{fd60c3ecf6544731a978894f4113d502,
title = "Ischemic preconditioning does not improve peak exercise capacity at sea level or simulated high altitude in trained male cyclists",
abstract = "Ischemic preconditioning (IPC) may improve blood flow and oxygen delivery to tissues, including skeletal muscle, and has the potential to improve intense aerobic exercise performance, especially that which results in arterial hypoxemia. The aim of the study was to determine the effects of IPC of the legs on peak exercise capacity (Wpeak), submaximal and peak cardiovascular hemodynamics, and peripheral capillary oxygen saturation (SpO2) in trained males at sea level (SL) and simulated high altitude (HA; 13.3{\%} FIO2, ∼3650 m). Fifteen highly trained male cyclists and triathletes completed 2 Wpeak tests (SL and HA) and 4 experimental exercise trials (10 min at 55{\%} altitude-specific Wpeak then increasing by 30Wevery 2 min until exhaustion) with and without IPC. HA resulted in significant arterial hypoxemia during exercise compared with SL (73{\%} ± 6{\%} vs. 93{\%} ± 4{\%} SpO2, p < 0.001) that was associated with 21{\%} lower Wpeak values. IPC did not significantly improve Wpeak at SL or HA. Additionally, IPC failed to improve cardiovascular hemodynamics or SpO2 during submaximal exercise or at Wpeak. In conclusion, IPC performed 45 min prior to exercise does not improve Wpeak or systemic oxygen delivery during submaximal or peak exercise at SL or HA. Future studies must examine the influence of IPC on local factors, such as working limb blood flow, oxygen delivery, and arteriovenous oxygen difference as well as whether the effectiveness of IPC is altered by the volume of muscle made ischemic, the timing prior to exercise, and high altitude acclimatization.",
keywords = "Cardiac output, Exertion, Hypoxia, Occlusion, Peripheral capillary oxygen saturation, Reperfusion",
author = "Hittinger, {Elizabeth A.} and Maher, {Jennifer L.} and Nash, {Mark S} and Arlette Perry and Joseph Signorile and Jochen Kressler and Kevin Jacobs",
year = "2015",
month = "1",
day = "1",
doi = "10.1139/apnm-2014-0080",
language = "English",
volume = "40",
pages = "65--71",
journal = "Applied Physiology, Nutrition and Metabolism",
issn = "1715-5312",
publisher = "National Research Council of Canada",
number = "1",

}

TY - JOUR

T1 - Ischemic preconditioning does not improve peak exercise capacity at sea level or simulated high altitude in trained male cyclists

AU - Hittinger, Elizabeth A.

AU - Maher, Jennifer L.

AU - Nash, Mark S

AU - Perry, Arlette

AU - Signorile, Joseph

AU - Kressler, Jochen

AU - Jacobs, Kevin

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Ischemic preconditioning (IPC) may improve blood flow and oxygen delivery to tissues, including skeletal muscle, and has the potential to improve intense aerobic exercise performance, especially that which results in arterial hypoxemia. The aim of the study was to determine the effects of IPC of the legs on peak exercise capacity (Wpeak), submaximal and peak cardiovascular hemodynamics, and peripheral capillary oxygen saturation (SpO2) in trained males at sea level (SL) and simulated high altitude (HA; 13.3% FIO2, ∼3650 m). Fifteen highly trained male cyclists and triathletes completed 2 Wpeak tests (SL and HA) and 4 experimental exercise trials (10 min at 55% altitude-specific Wpeak then increasing by 30Wevery 2 min until exhaustion) with and without IPC. HA resulted in significant arterial hypoxemia during exercise compared with SL (73% ± 6% vs. 93% ± 4% SpO2, p < 0.001) that was associated with 21% lower Wpeak values. IPC did not significantly improve Wpeak at SL or HA. Additionally, IPC failed to improve cardiovascular hemodynamics or SpO2 during submaximal exercise or at Wpeak. In conclusion, IPC performed 45 min prior to exercise does not improve Wpeak or systemic oxygen delivery during submaximal or peak exercise at SL or HA. Future studies must examine the influence of IPC on local factors, such as working limb blood flow, oxygen delivery, and arteriovenous oxygen difference as well as whether the effectiveness of IPC is altered by the volume of muscle made ischemic, the timing prior to exercise, and high altitude acclimatization.

AB - Ischemic preconditioning (IPC) may improve blood flow and oxygen delivery to tissues, including skeletal muscle, and has the potential to improve intense aerobic exercise performance, especially that which results in arterial hypoxemia. The aim of the study was to determine the effects of IPC of the legs on peak exercise capacity (Wpeak), submaximal and peak cardiovascular hemodynamics, and peripheral capillary oxygen saturation (SpO2) in trained males at sea level (SL) and simulated high altitude (HA; 13.3% FIO2, ∼3650 m). Fifteen highly trained male cyclists and triathletes completed 2 Wpeak tests (SL and HA) and 4 experimental exercise trials (10 min at 55% altitude-specific Wpeak then increasing by 30Wevery 2 min until exhaustion) with and without IPC. HA resulted in significant arterial hypoxemia during exercise compared with SL (73% ± 6% vs. 93% ± 4% SpO2, p < 0.001) that was associated with 21% lower Wpeak values. IPC did not significantly improve Wpeak at SL or HA. Additionally, IPC failed to improve cardiovascular hemodynamics or SpO2 during submaximal exercise or at Wpeak. In conclusion, IPC performed 45 min prior to exercise does not improve Wpeak or systemic oxygen delivery during submaximal or peak exercise at SL or HA. Future studies must examine the influence of IPC on local factors, such as working limb blood flow, oxygen delivery, and arteriovenous oxygen difference as well as whether the effectiveness of IPC is altered by the volume of muscle made ischemic, the timing prior to exercise, and high altitude acclimatization.

KW - Cardiac output

KW - Exertion

KW - Hypoxia

KW - Occlusion

KW - Peripheral capillary oxygen saturation

KW - Reperfusion

UR - http://www.scopus.com/inward/record.url?scp=84920683675&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84920683675&partnerID=8YFLogxK

U2 - 10.1139/apnm-2014-0080

DO - 10.1139/apnm-2014-0080

M3 - Article

C2 - 25474566

AN - SCOPUS:84920683675

VL - 40

SP - 65

EP - 71

JO - Applied Physiology, Nutrition and Metabolism

JF - Applied Physiology, Nutrition and Metabolism

SN - 1715-5312

IS - 1

ER -