Effects of ischemic preconditioning on local hemodynamics and isokinetic muscular function

Huang, BH; Wang, TY; Lu, KH; Chang, CY; Chan, KH

Effects of ischemic preconditioning on local hemodynamics and isokinetic muscular function

Huang, BH Wang, TY Lu, KH Chang, CY Chan, KH

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Publisher:: IOS PRESS
Publication Type:: Journal Article
Citation:: Isokinetics and Exercise Science, 2020, 28, (1), pp. 73-81
Issue Date:: 2020-01-01

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Field	Value	Language
dc.contributor.author	Huang, BH
dc.contributor.author	Wang, TY
dc.contributor.author	Lu, KH
dc.contributor.author	Chang, CY
dc.contributor.author	Chan, KH
dc.date.accessioned	2022-10-30T19:51:48Z
dc.date.available	2022-10-30T19:51:48Z
dc.date.issued	2020-01-01
dc.identifier.citation	Isokinetics and Exercise Science, 2020, 28, (1), pp. 73-81
dc.identifier.issn	0959-3020
dc.identifier.issn	1878-5913
dc.identifier.uri	http://hdl.handle.net/10453/162954
dc.description.abstract	BACKGROUND: The ergogenic effect of ischemic preconditioning (IPC) has been widely approved, but the mechanisms underlying the beneficial effects are still not fully clarified. OBJECTIVE: The aim of this study was to examine the effects of IPC on human isokinetic muscular function and hemodynamics during exercise. METHODS: In a counterbalanced, crossover study, 14 healthy non-athletic males (26.0 ± 3.5 years) performed isokinetic muscle strength and endurance tests of the dominant leg on an isokinetic dynamometer, preceded by either IPC on bilateral thighs (3 × 5-min compression/5-min reperfusion cycles at 50 mmHg greater than the participant's systolic blood pressure) or SHAM (10 mmHg) intervention. Participants underwent strength testing by performing three maximum isokinetic knee extensions and flexions at the angular velocities of 30·°s-1, 150·°s-1, and 270·°s-1. An endurance test was also conducted over 30 repetitions at 180°/s. Hemodynamics of the vastus lateralis muscle were monitored before and after the interventions and during exercise tests by near-infrared spectrometer (NIRS). RESULTS: Resting total hemoglobin significantly increased after IPC (p= 0.048, d= 0.15). During the endurance testing, the oxygen uptake was significantly improved after IPC as shown by the change of oxygenated hemoglobin, deoxygenated hemoglobin, and oxygen saturation, at small to moderate effect size. However, both muscular strength and endurance were found unchanged. CONCLUSION: IPC improves the local oxygenation status without altering maximal muscle strength and endurance in young non-athletic males.
dc.language	English
dc.publisher	IOS PRESS
dc.relation.ispartof	Isokinetics and Exercise Science
dc.relation.isbasedon	10.3233/IES-194184
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0913 Mechanical Engineering, 1106 Human Movement and Sports Sciences
dc.subject.classification	Sport Sciences
dc.title	Effects of ischemic preconditioning on local hemodynamics and isokinetic muscular function
dc.type	Journal Article
utslib.citation.volume	28
utslib.for	0913 Mechanical Engineering
utslib.for	1106 Human Movement and Sports Sciences
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Health
pubs.organisational-group	/University of Technology Sydney/Faculty of Health/Public Health
utslib.copyright.status	closed_access	*
dc.date.updated	2022-10-30T19:51:46Z
pubs.issue	1
pubs.publication-status	Published
pubs.volume	28
utslib.citation.issue	1

Abstract:

BACKGROUND: The ergogenic effect of ischemic preconditioning (IPC) has been widely approved, but the mechanisms underlying the beneficial effects are still not fully clarified. OBJECTIVE: The aim of this study was to examine the effects of IPC on human isokinetic muscular function and hemodynamics during exercise. METHODS: In a counterbalanced, crossover study, 14 healthy non-athletic males (26.0 ± 3.5 years) performed isokinetic muscle strength and endurance tests of the dominant leg on an isokinetic dynamometer, preceded by either IPC on bilateral thighs (3 × 5-min compression/5-min reperfusion cycles at 50 mmHg greater than the participant's systolic blood pressure) or SHAM (10 mmHg) intervention. Participants underwent strength testing by performing three maximum isokinetic knee extensions and flexions at the angular velocities of 30·°s-1, 150·°s-1, and 270·°s-1. An endurance test was also conducted over 30 repetitions at 180°/s. Hemodynamics of the vastus lateralis muscle were monitored before and after the interventions and during exercise tests by near-infrared spectrometer (NIRS). RESULTS: Resting total hemoglobin significantly increased after IPC (p= 0.048, d= 0.15). During the endurance testing, the oxygen uptake was significantly improved after IPC as shown by the change of oxygenated hemoglobin, deoxygenated hemoglobin, and oxygen saturation, at small to moderate effect size. However, both muscular strength and endurance were found unchanged. CONCLUSION: IPC improves the local oxygenation status without altering maximal muscle strength and endurance in young non-athletic males.

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http://hdl.handle.net/10453/162954