Effect of continuous negative-pressure breathing on skin blood flow during exercise in a hot environment

Kei Nagashima, Hiroshi Nose, Akira Takamata, Taketoshi Morimoto

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

To assess the impact of continuous negative-pressure breathing (CNPB) on the regulation of skin blood flow, we measured forearm blood flow (FBF) by venous-occlusion plethysmography and laser-Doppler flow (LDF) at the anterior chest during exercise in a hot environment (ambient temperature = 30°C, relative humidity = ~30%). Seven male subjects exercised in the upright position at an intensity of 60% peak oxygen consumption rate for 40 min with and without CNPB after 20 min of exercise. The esophageal temperature (T(es)) in both conditions increased to 38.1°C by the end of exercise, without any significant differences between the two trials. Mean arterial pressure (MAP) increased by ~15 mmHg by 8 min of exercise, without any significant difference between the two trials before CNPB. However, CNPB reduced MAP by ~10 mmHg after 24 min of exercise (P < 0.05). The increase in FBF and LDF in the control condition leveled off after 18 min of exercise above a T(es) of 37.7°C, whereas in the CNPB trial the increase continued, with a rise in T(es) despite the decrease in MAP. These results suggest that CNPB enhances vasodilation of skin above a Te, of ~38°C by stretching intrathoracic baroreceptors such as cardiopulmonary baroreceptors.

Original languageEnglish
Pages (from-to)1845-1851
Number of pages7
JournalJournal of Applied Physiology
Volume84
Issue number6
Publication statusPublished - 1998
Externally publishedYes

Fingerprint

Respiration
Pressure
Skin
Arterial Pressure
Pressoreceptors
Forearm
Lasers
Temperature
Plethysmography
Humidity
Vasodilation
Oxygen Consumption
Thorax

Keywords

  • Active vasodilation
  • Baroreceptors
  • Forearm blood flow
  • Laser-Doppler flow

ASJC Scopus subject areas

  • Physiology
  • Endocrinology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Effect of continuous negative-pressure breathing on skin blood flow during exercise in a hot environment. / Nagashima, Kei; Nose, Hiroshi; Takamata, Akira; Morimoto, Taketoshi.

In: Journal of Applied Physiology, Vol. 84, No. 6, 1998, p. 1845-1851.

Research output: Contribution to journalArticle

Nagashima, Kei ; Nose, Hiroshi ; Takamata, Akira ; Morimoto, Taketoshi. / Effect of continuous negative-pressure breathing on skin blood flow during exercise in a hot environment. In: Journal of Applied Physiology. 1998 ; Vol. 84, No. 6. pp. 1845-1851.
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