NDLI: Limb-specific training affects exercise hyperemia but not sympathetic vasoconstriction

Content Provider	Springer Nature Link
Author	Wimer, Gregory S. Baldi, James C.
Copyright Year	2012
Abstract	This study used cross-sectional and longitudinal training research designs to determine if (a) exercise hyperemia is enhanced in exercise-trained forearms and (b) sympathetic vasoconstriction of the trained forearm is attenuated (sympatholysis) during handgrip exercise. In the cross-sectional comparison, 10 rock climbers, 10 runners, 10 controls participated while the longitudinal training study examined vascular responsiveness in six untrained men before and after 6 weeks of handgrip training. Mean blood velocity, brachial artery diameter, heart rate, and systemic blood pressure were measured at rest, during a cold pressor test (CPT), dynamic handgrip exercise at 30% MVC with and without CPT, and during reactive hyperemia. During the resting CPT, forearm blood flow (FBF) decreased less (P < 0.05) in runners than in climbers, the decline being −6.30 + 30.05 and −34.3 + 20.54 during the last minute, respectively. During handgrip exercise, FBF and vascular conductance (VC) increased more (P < 0.05) in climbers than in runners and controls, the latter reaching 3.98 + 1.11, 2.22 + 0.88, and 2.75 + 1.06 ml min−1 mmHg−1, respectively. When a CPT was added during handgrip exercise, the reduction in FBF and VC was not different between the groups. Handgrip training increased (P < 0.05) forearm volume (5 + 3%) and MVC (25 + 29%), but did not affect FBF or VC during a CPT, with or without exercise. These data suggest that arm-trained athletes have greater exercise hyperemia. However, this training effect is not explained by sympatholysis and is not evident after 6 weeks of handgrip training in previously untrained subjects.
Starting Page	3819
Ending Page	3828
Page Count	10
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	112
Issue Number	11
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-03-01
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sympatholysis Exercise training Limb specificity Sympathetic vasoconstriction Human Physiology Occupational Medicine/Industrial Medicine Sports Medicine
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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