Document Detail


Anticipatory responses of catecholamines on muscle force production.
MedLine Citation:
PMID:  16959907     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Few data exist on the temporal relationship between catecholamines and muscle force production in vivo. The purpose of this study was to examine the influence of preexercise arousal on sympathoadrenal neurohormones on muscular force expression during resistance exercise. Ten resistance-trained men completed two experimental conditions separated by 7 days: 1) acute heavy resistance exercise protocol (AHREP; 6 x 10 repetitions parallel squats, 80% 1 repetition maximum) and 2) control (Cont; rest). Peak force (F(peak)) was recorded during a maximal isometric squat preceding each set and mean force (F(mean)) was measured during each set. Serial venous blood samples were collected before the AHREP and immediately preceding each set. Blood collection times were matched during Cont. Preexercise epinephrine (Epi), norepinephrine (NE), and dopamine (DA) increased (P <or= 0.05) above Cont by 270, 255, and 164%, respectively. During exercise, Epi, NE, and DA continued to increase by 512, 271, and 38%, respectively, above preexercise values. F(peak) and F(mean) decreased by approximately 20-25% over the course of the AHREP. Post hoc data analysis revealed that five subjects (F(maintainers)) showed no decline (P >or= 0.05) in muscular performance (F(peak), F(mean)) during AHREP and that five subjects (F(reducers)) had significant reductions in F(peak) and F(mean). Integrated area under the curve for Epi, NE, and F(peak) were greater (P < 0.02) for F(maintainers) than F(reducers). In conclusion, an anticipatory rise in catecholamines existed, which may be essential for optimal force production at the onset of exercise.
Authors:
Duncan N French; William J Kraemer; Jeff S Volek; Barry A Spiering; Daniel A Judelson; Jay R Hoffman; Carl M Maresh
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial     Date:  2006-09-07
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  102     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2007-01-08     Completed Date:  2007-03-13     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  94-102     Citation Subset:  IM    
Affiliation:
Human Performance Laboratory, Department of Kinesiology, Unit 1110, University of Connecticut, Storrs, CT 06269-1110, USA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Arousal / physiology*
Catecholamines / blood*
Cross-Over Studies
Dopamine / blood
Epinephrine / blood
Exercise / physiology*
Homeostasis / physiology
Humans
Male
Muscle Contraction / physiology*
Muscle, Skeletal / physiology*
Norepinephrine / blood
Physical Exertion / physiology
Testosterone / blood
Weight Lifting / physiology
Chemical
Reg. No./Substance:
0/Catecholamines; 51-41-2/Norepinephrine; 51-43-4/Epinephrine; 58-22-0/Testosterone

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