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Skin vascular response in the hand during sinusoidal exercise in physically trained subjects
1Department of Clinical Pathophysiology, School of Health Sciences, Univ. of Occupational and Environmental Health (UOEH), 1-1 Iseigaoka, Yahatanishi-ku, 807-8555 Kitakyushu, Japan. yamazaki@health.uoeh-u.ac.jp
European Journal of Applied Physiology
|September 25, 2003
Summary
Physical training affects skin blood flow responses during exercise. Trained individuals exhibit a slower cutaneous vascular conductance response to transient exercise loads compared to untrained individuals.
Area of Science:
- Exercise Physiology
- Cardiovascular Physiology
- Dermatology
Background:
- The impact of physical training on skin blood flow regulation during dynamic exercise is not fully understood.
- Cutaneous vascular conductance (CVC) plays a vital role in thermoregulation during physical activity.
Purpose of the Study:
- To investigate the phase and amplitude responses of CVC in the hand during sinusoidal exercise in trained versus untrained individuals.
- To compare the differences in vascular responses between glabrous (palm) and nonglabrous (dorsal hand) skin.
Main Methods:
- Subjects performed sinusoidal exercise on a cycle ergometer for 32 minutes with varying load intensities and durations.
- Skin blood flow was measured using laser-Doppler flowmetry, and CVC was calculated.
- Analysis focused on the amplitude and phase lag of CVC relative to the exercise load.
Main Results:
- CVC amplitude was lower in the dorsal hand than the palm during shorter exercise periods (1-4 min).
- Phase lag of CVC was smaller in the dorsal hand than the palm during longer exercise periods (8-16 min).
- While amplitude responses did not differ between groups, trained subjects showed a larger phase lag (slower response) in both dorsal hand and palm CVC.
Conclusions:
- Glabrous and nonglabrous skin exhibit distinct vascular responses to transient exercise loads.
- Endurance exercise training appears to attenuate the speed of the cutaneous vascular response to exercise stimuli.