The extent of increase in the peripheral circulation of the hamster's buccal pouch by the actions of varying magnetic field of 2 kinds of permanent magnets of different gauss was determined by the advance laser flowmeter·ALF 2100, and the following conclusions were obtained:
1) Control (blood flow in the buccal pouch):
Blood flow of 3.8±0.4ml/min/100 g was observed.
2) Blood flow in the buccal pouch as applied with a magnet of 1200 gauss (9 mmdiameter, 7 mm-height, cylindrical):
Blood flow of 10.2±1.3ml/min/100g was observed with a significant diffecence (p<0.01) from the control.
3) Blood flow in the buccal pouch as applied with a magnet of 1200 gauss (15 mmdiameter, 7 mm-height, cylindrical):
Blood flow of 17.1±1.7ml/min/100g was observed with a significant difference (p<0.001) from the control.
The above results confirmed that a magnet of larger diameter caused more blood flow than that of smaller diameter. It was also revealed that this action of the applied magnet was exerted immediately upon the blood flow and kept this constant regardless of the time, and returned to original values immediately after stopping.

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The respective actions of N-pole and S-pole of 2 kinds of permanent magnets of different gauss on the peripheral circulatory kinetics of the hamster's buccal pouch were determined by the laser doppler flowmeter (LDF), and the following conclusions were obtained:
1) Cylindrical N-pole of 15 mm-diameter and 7 mm-height of a magnet of 1200 gauss caused an increase in blood flow of 0.44±0.07 V compared with a decrease of -0.37±0.05 V for S-pole.
2) Cylindrical N-pole of 9 mm-diameter and 7 mm-height of the same magnet caused an increase in blood flow of 0.20±0.03 V, parallel to that of 0.19±0.03 V for S-pole.
The above results confirmed that a permanent magnet of a constant gauss N-pole caused increased blood flow regardless of its magnitude but S-pole caused an alternation of increase and decrease according to its magnitude. It was also proved that the action of the magnet applied was exerted immediately upon the blood flow and kept this constant regardless of time, and returned to original values immediately after stopping.

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The application of a permanent magnet of 1200 gauss (cylindrical 9 mm in diameter, 7 mm in height) onto the hamster's buccal pouch gave the following interesting results by the laser flowmeter of the peripheral circulatory kinetics according to a change in the combination of polarities (N-pole, S-pole):
1) Group (N-group) of hamsters, whose buccal pouch was subjected to the N-pole of the magnet for one minute and then for nine consecutive minutes.
The application of the N-pole caused an instantaneous increase in blood flow (one minute-value: 10.8±0.4ml/min/100g); this increment was constant, lasting up the ninth minute.
2) Group (NS-group) of hamsters, whose buccal pouch was subjected to the N-pole of the magnet for one minute and immediately thereafter to the S-pole for nine minutes.
The application of the S-pole after the N-pole caused only an increase in blood flow of 0.8±0.2ml/min/100g in one minute, but caused gradual increases up to the ninth minute. However, a significant difference from the N-group (p<0.001) was noted.
3) Group (S-group) of hamsters, whose buccal pouch was subjected to the S-pole for one minute and then for nine consecutive minutes.
The application of the S-pole caused an instantaneous increase in blood flow (one minutevalue: 10.6±0.8ml/min/100g): this increment was constant, lasting up to the ninth minute.
4) Group (SN-group) of hamsters, whose buccal pouch was subjected to the S-pole of the magnet for one minute and immediately thereafter to the N-pole for nine minutes. The application of the N-pole after the S-pole only an increase in blood flow of 0.9±0.2 ml/min/100g in one minute, but caused gradual increases up to the ninth minute. However, a significant diffecence from the S-group (p<0.001) was noted.
The above results revealed increases in blood flow of the buccal pouch for the N-group and the S-group, but not for the NS-group and the SN-group in combination of both poles, rather with significant differences from the N-group and the S-group.
This suggests that the application of a permanent magnet for the purpose of improving the blood flow leads to insuffecient improvement in the peripheral blood flow without due consideration of the combination of polarities.

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