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Blood flow regulation and oxygen uptake during high intensity forearm exercise.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Nyberg, Stian Kwak Berg, Ole Kristian Helgerud, Jan Wang, Eivind
Description	Author Affiliation: Nyberg SK ( Norwegian University of Science and Technology.); Berg OK ( Molde University College.); Helgerud J ( Norwegian University of Science and Technology.); Wang E ( Norvegian University of Science and Technology eivind.wang@ntnu.no.)
Abstract	The vascular strain is very high during heavy handgrip exercise, but the intensity and kinetics to reach peak blood flow, and peak oxygen uptake, are uncertain. We included 9 young (25±2yr) healthy males to evaluate blood flow and oxygen uptake responses during continuous dynamic handgrip exercise with increasing intensity. Blood flow was measured using Doppler-ultrasound and venous blood was drawn from a deep forearm vein to determine arteriovenous oxygen difference (a-vO ) during 6-minutes bouts of 60, 80 and 100% of maximal work rate (WR ), respectively. Blood flow and oxygen uptake increased (p<0.05) from 60%WR (557±177(SD) mLâmin ; 56.0±21.6 mLâmin ) to 80%WR (679±190 mLâmin ; 70.6±24.8 mLâmin ), but no change was seen from 80%WR to 100%WR Blood velocity (49.5±11.5 cmâsec to 58.1±11.6 cmâsec ) and brachial diameter (0.49±0.05cm to 0.50±0.06 cm) showed concomitant increases (p<0.05) with blood flow from 60% to 80%WRmax, while no differences were observed in a-vO Shear rate also increased (p<0.05) from 60% (822±196 s ) to 80% (951±234 s ) of WR The mean response time (MRT) was slower (p<0.05) for blood flow (60%WR :50±22s; 80%WR :51±20s; 100%WRmax:51±23s) than a-vO (60%WR :29±9s; 80%WR :29±5s; 100%WR :20±5s), but not different from oxygen uptake (60%WR :44±25s; 80%WR :43±14s; 100%WR :41±32s). No differences were observed in MRT for blood flow or oxygen uptake with increased exercise intensity. In conclusion, when approaching maximal intensity, oxygen uptake appeared to reach a critical level at ~80% of WR and be regulated by blood flow. This implies that high, but not maximal, exercise intensity may be an optimal stimulus for shear stress-induced small muscle mass training adaptations.
File Format	HTM / HTML
ISSN	87507587
e-ISSN	15221601
Journal	Journal of Applied Physiology
Language	English
Publisher	American Physiological Society
Publisher Date	2017-01-05
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Applied Physiology Molecular Biology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Sports Science

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