Key result
Local heating of the hand to 39-41°C in a warm state decreased finger blood flow, whereas in a cool state, blood flow increased at water temperatures of 41-43°C.
Why the study?
Does local heating of the hand affect finger blood flow under different systemic thermal states?
Does local heating of the hand affect finger blood flow under different systemic thermal states?
The vasomotor response of the hand to local heating is modulated by the body's systemic thermal state.
Answers are grounded in this paper and cite their sources.
Systemic thermal state modulates hand vasomotor responses to local heating; hypothesis-generating for thermoregulation and should not change practice.
Finger blood flow (BF) was measured by venous occlusion plethysmography using mercury-in-Silastic strain gauges during immersion of one hand in hot water (raised by steps of 2 degrees C every 10 min from 35 to 43 degrees C), the other being a control (kept immersed in water at 35 degrees C). The measurements were made in three different thermal states on separate days: 1) cool-25 degrees C, 40% rh, esophageal temperature (Tes) = 36.64 +/- 0.10 degrees C; 2) warm-35 degrees C, 40% rh, Tes = 36.71 +/- 0.11 degrees C; and 3) hot-35 degrees C, 80% rh with the legs immersed in water at 42 degrees C, Tes = 37.26 +/- 0.11 degrees C. When water temperature was raised at 42 degrees C, Tes = 37.26 +/- 0.11 When water temperature was raised to 39-41 degrees C in the warm state, finger BF in the hand heated locally (BFw) decreased. When water temperature was raised to 43 degrees C, however, BFw returned to the control value. In the hot state, Tes rose steadily, reaching 37.90 +/- 0.12 degrees C at the end of the 50-min sessions. BF in the control finger also increased gradually during the session. BFw showed a tendency to decrease when water temperature was raised to 39 degrees C, but the change was not greater than that observed in the warm state. In the cool state, no such reduction in BFw was observed when water temperature was raised to 39-41 degrees C. On the contrary, BFw increased at water temperatures of 41-43 degrees C.(ABSTRACT TRUNCATED AT 250 WORDS)
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Nagasaka et al. (1987) studied this question. Immersion of one hand in hot water vs. Immersion in water at 35 degrees C was evaluated on Finger blood flow. Local heating of the hand to 39-41°C in a warm state decreased finger blood flow, whereas in a cool state, blood flow increased at water temperatures of 41-43°C.
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