Effective regularity in modulation on gastric motility induced by different acupoint stimulation

AIM： To investigate whether manual acupuncture at representative acupoints in different parts of the body can modulate responses of gastric motility in rats and regular effects in different acupoint stimulation. METHODS： The gastric motor activity of rats was recorded by the intrapyloric balloon. The changes of gastric motility induced by the stimulation were compared with the background activity in intragastric pressure and/or waves of gastric contraction recorded before any stimulation. Morphological study was also conducted by observing the Evans dye extravasation in the skin after mustard oil injection into the intragastric mucous membrane to certify cutaneous innervations of blue dots related to gastric segmental innervations. RESULTS： In all six rats that received mustard oil injections into intragastric mucosa, small blue dots appeared in the skin over the whole abdomen, but mainly in peri-midline upper- and middle- abdomen and middle-back, a few in thigh and groin. It may speculate that cutaneous innervations of blue dots have the same distribution as gastric segmental innervations. Acustimulation in acupoints of head-neck, four limbs, upper chest-dorsum and Iower-dorsum induced markedly augmentation of gastric motility （acupoints on headneck such as St-2： n = 16, 105.19 ± 1.36 vs 112.25 ± 2.02 and St-3： n = 14, 101.5 ± 1.75 vs 109.36 ± 1.8; acupoints on limbs such as Sp-6： n = 19, 100.74 ± 1.54 vs 110.26 ± 3.88; St-32： n = 17, 103.59 ± 1.64 vs 108.24 ± 2.41; St-36： n = 16, 104.81 ± 1.72 vs 110.81 ± 2.74 and U-11： n = 17, 106.47 ± 2.61 vs 114.77 ± 3.77, P 〈 0.05-0.001）. Vigorous inhibitory regulations of gastric motility induced by acu-stimulation applied in acupoints on whole abdomen and middle-dorsum were significantly different as compared with the controls before acu-stimulation （abdomen acupoints such as Cv-12： n = 11, 109.36 ± 2.09 vs 101 ± 2.21; Cv-6： n = 18, 104.39 ± 1.42 vs 91.83 ± 3.22 and St-21： n = 12, 107 ± 2.97 vs 98.58 ± 2.81; acupoints on middledorsum such as BI-17： n = 19, 100.63 ± 1.4 vs 92.21 ± 2.07 and BI-21： n = 19, 103.84 ± 1.48 vs 97.58 ± 2.16, P 〈 0.05-0.001）. CONCLUSION： Regular regulatory effects of facilitation and inhibition on gastric motility appear to be somatotopically organized in the acupoints of whole body, and the effective regularity of site-special acupoints on gastric motility is involved in segmental innervations between stomach and acupoints.

WIND SPEED DISTRIBUTION REGULARITY AND WIND REDUCTION EFFECT OF SHELTER NET

Wind speed distribution regularities in a shelter mesh (S. M.) have been deduced from the wind speed distribution in the sheltered area of a single shelter beh (S. B.).The components of a wind vector in a mesh follow the error function distribution model or the logarithmic model of 2-variable power function.The wind vector itself follows the vector composition model of these models.We can calculate the wind speed distribution and wind reduction effect of a mesh under the conditions of any shelter-belt characteristics, any size and shape of a mesh and any wind inclination angle with this model. The results of our field model experiment are in better agreement with the theoretically calculated results.