Effects of cooling or warming of the distal upper limb on skin vascular conductance and brachial artery shear profiles during cycling exercise. Issue 3 (4th May 2022)

• Record Type: Journal Article
• Authors: Miura, Kohei; Kashima, Hideaki; Namura, Saki; Morimoto, Marina; Endo, Masako Y.; Oue, Anna; Fukuba, Yoshiyuki
• Is Part Of: Research in sports medicine. Volume 30:Issue 3(2022)
• Page Start: 308
• Page End: 324
• Publication Date: 2022-05-04
• Subjects: Shear stress -- exercise -- vascular conductance -- thermal manipulation; Sports medicine -- Periodicals; Athletic Injuries -- Periodicals; Exercise -- Periodicals; Sports Medicine -- Periodicals; Médecine du sport -- Périodiques; 617.102705
• DOI: 10.1080/15438627.2021.1872573
• Languages: English
• ISSNs: 1543-8627

Abstract

ABSTRACT: The relative influence of skin vascular conductance in glabrous (G; palm) and non-glabrous (NG; dorsal and forearm) regions to upstream brachial artery-shear stress (BA-SS) profile are unknown. This study aimed to elucidate the effects of G and/or NG skin vascular conductance (VC), which were modulated by warming or cooling manipulation, on BA-shear rate (SR, an estimate of SS) during cycling exercise. Seven healthy subjects performed 60-min exercise. Between 20 and 50 min of the exercise, the NG+G or G skin region were warmed to 42°C or cooled to 15°C using a water bath. Throughout the protocol, diameter and blood velocity in BA and skin VCs in forearm and palm were measured. All measurements showed that a steady-state response was reached after 20 min of exercise. Subsequently, during cooling manipulation, forearm VC was significantly decreased, and the concomitant BA-SR profile was revealed (primarily characterized by decreased antegrade SR and increased retrograde SR) in the NG+G. Such changes were not observed in G alone. During warming manipulation, forearm VC and mean BA-SR significantly increased only in the NG+G. In conclusion, vascular response in NG skin possibly plays a major role in the modulation of BA-SS profile during cycling exercise.