Abstract
The effect of cold pressor (CP) stimulation and sustained isometric contraction on the blood volume of the right masseter muscle was examined in seven healthy males, who performed 1 min of isometric jaw clenching at 50% of their maximum voluntary contraction without, with and again without a 4°C CP stimulation. Total haemoglobin was measured in the masseter before, during and after the contraction task using near-infrared spectroscopy. CP stimulation during the isometric contraction diminished the magnitude of the contraction-induced decrease of blood volume when compared to the trials without CP stimulation. However, in the immediate post-contraction period (while the CP stimulation was still in place), no increase in blood volume above the usual post-contraction hyperaemia was evident. Once the CP stimulation had been removed, there was a clear decrease (faster return to baseline) in the vasodilation occurring in the post-contraction period. This diminished period of vasodilation occurred in spite of the fact that the vascular resistance (blood pressure) and heart rate were still substantially elevated by the CP effect during this same period. These data suggest that the strong CP stimulation produced a biphasic response. First, there was an early-onset strong vasodilation (during CP), which was followed by a period of diminished vasodilation, suggesting that an active, but delayed, vasoconstrictive drive may be induced by the CP stimulus.
| Original language | English |
|---|---|
| Pages (from-to) | 969-973 |
| Number of pages | 5 |
| Journal | Archives of Oral Biology |
| Volume | 44 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 1999 |
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Keywords
- Cold pressor
- Isometric contraction
- Masseter muscle
- Near infra-red spectroscopy
- Sympathetic activation
ASJC Scopus subject areas
- Dentistry(all)
Cite this
Effect of cold pressor stimulation (4°C) on human masseter muscle haemodynamics during and after sustained isometric contraction. / Maekawa, Kenji; Kuboki, Takuo; Yamashita, Atsushi; Clark, Glenn T.
In: Archives of Oral Biology, Vol. 44, No. 11, 11.1999, p. 969-973.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of cold pressor stimulation (4°C) on human masseter muscle haemodynamics during and after sustained isometric contraction
AU - Maekawa, Kenji
AU - Kuboki, Takuo
AU - Yamashita, Atsushi
AU - Clark, Glenn T.
PY - 1999/11
Y1 - 1999/11
N2 - The effect of cold pressor (CP) stimulation and sustained isometric contraction on the blood volume of the right masseter muscle was examined in seven healthy males, who performed 1 min of isometric jaw clenching at 50% of their maximum voluntary contraction without, with and again without a 4°C CP stimulation. Total haemoglobin was measured in the masseter before, during and after the contraction task using near-infrared spectroscopy. CP stimulation during the isometric contraction diminished the magnitude of the contraction-induced decrease of blood volume when compared to the trials without CP stimulation. However, in the immediate post-contraction period (while the CP stimulation was still in place), no increase in blood volume above the usual post-contraction hyperaemia was evident. Once the CP stimulation had been removed, there was a clear decrease (faster return to baseline) in the vasodilation occurring in the post-contraction period. This diminished period of vasodilation occurred in spite of the fact that the vascular resistance (blood pressure) and heart rate were still substantially elevated by the CP effect during this same period. These data suggest that the strong CP stimulation produced a biphasic response. First, there was an early-onset strong vasodilation (during CP), which was followed by a period of diminished vasodilation, suggesting that an active, but delayed, vasoconstrictive drive may be induced by the CP stimulus.
AB - The effect of cold pressor (CP) stimulation and sustained isometric contraction on the blood volume of the right masseter muscle was examined in seven healthy males, who performed 1 min of isometric jaw clenching at 50% of their maximum voluntary contraction without, with and again without a 4°C CP stimulation. Total haemoglobin was measured in the masseter before, during and after the contraction task using near-infrared spectroscopy. CP stimulation during the isometric contraction diminished the magnitude of the contraction-induced decrease of blood volume when compared to the trials without CP stimulation. However, in the immediate post-contraction period (while the CP stimulation was still in place), no increase in blood volume above the usual post-contraction hyperaemia was evident. Once the CP stimulation had been removed, there was a clear decrease (faster return to baseline) in the vasodilation occurring in the post-contraction period. This diminished period of vasodilation occurred in spite of the fact that the vascular resistance (blood pressure) and heart rate were still substantially elevated by the CP effect during this same period. These data suggest that the strong CP stimulation produced a biphasic response. First, there was an early-onset strong vasodilation (during CP), which was followed by a period of diminished vasodilation, suggesting that an active, but delayed, vasoconstrictive drive may be induced by the CP stimulus.
KW - Cold pressor
KW - Isometric contraction
KW - Masseter muscle
KW - Near infra-red spectroscopy
KW - Sympathetic activation
UR - http://www.scopus.com/inward/record.url?scp=0033229796&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033229796&partnerID=8YFLogxK
U2 - 10.1016/S0003-9969(99)00093-X
DO - 10.1016/S0003-9969(99)00093-X
M3 - Article
C2 - 10580545
AN - SCOPUS:0033229796
VL - 44
SP - 969
EP - 973
JO - Archives of Oral Biology
JF - Archives of Oral Biology
SN - 0003-9969
IS - 11
ER -