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‘Asanena rajo hanti says an Upanishad‘. There is another important asana which will help in reducing the rajas by improving the tone of the parasympathetic of which the vegas is an important part. ‘Asanena rajo hanti says an Upanishad‘。 这里还有另一个重要体式，它将通过提升副交感神经的品质来减少激性，其中vegas（维加斯）是最重要的一部分。 The vegal nerve emanates from the occipital region of the brain.The back portion of the brain is on the ground in Sarvangasana and the CSF is supposed to empty into the fourth ventricle which is in the occipital region and stimulates the vegas nuclii. vegal神经从大脑枕骨区域发出。在肩倒立体式中大脑后部触地，脑脊液流至枕骨区域的第四心房并给予vegas 核刺激。 So a proper balance between Sirsasana and sarvangasana would bring about the required equilibrium between the sympathetic and the parasympathetic nervous systems or bring about a parity between Rajas and Tamas physiologically. 由而头倒立与肩倒立之间的适当平衡将带来交感神经与副交感神经之间所需的平衡，或者说实现激性与惰性在生理上的对等。 Ultimately Yoga requires one to improve satva as it is the most desirable quality. The procedure that is used by Yogis to suppress Tamas and simultaneously increase satva is pranayama. Satva indicates a proper functioning of the brain and the central nervous system whereas Rajas and Tamas may be related to the functioning of the sympathetic and parasympathetic nervous systems. 最终瑜伽需要个体提升悦性，这也是最受瑜伽士喜爱的品质。瑜伽士使用呼吸控制法来抑制惰性并同时增加悦性。悦性暗指大脑以及中枢神经系统的适当功能，然而激性与惰性可能与交感神经系统与副交感神经的功能运作有关。 It is an ingenious approach of yogis to increase satva or bring the central nervous system under good control. Breathing is usually under involuntary mode. Sympathetic acts during inhalation and the parasympathetic is active during exhalation. 这是瑜伽士所得出的一个巧妙的成果，用以增加悦性并让中枢神经系统处于良好的掌控之下。呼吸往往处于非自主模式下。吸气时交感神经活动增加，而呼气时副交感神经系统活动增加。 So normal breathing is involuntary. The central nervous system consists of the brain and the spinal cord and is responsible for out thinking and all activities we do voluntarily including meditation. 由而通常的呼吸是不自主的。中枢神经系统是由大脑以及脊髓构成的，并负责思考我们所有的自主活动，甚至包括冥想。 In voluntary breathing which is pranayama, the breathing is brought under the central nervous system-- there are two centers of breathing one voluntary and the other involuntary. By doing pranayama, the yogi is able to work with the central nervous system and increase the dominance of satva. Pranayama on one hand helps to reduce tamas and increase satva, as Patanali puts it “ tatah kshiyate prakas aavaranam and dharanasu ca yogtataa manasaH” 自主呼吸即呼吸控制法，呼吸处在中枢神经系统的掌控之下。我们有两个呼吸中枢，一个为自主一个为非自主。通过练习呼吸控制法，瑜伽士得以使中枢神经系统良好运作并增加悦性的主导。呼吸控制法一方面帮助减少惰性，同时也帮助提升悦性。正如派坦加利对此形容到“ tatah kshiyate prakas aavaranam and dharanasu ca yogtataa manasaH”。 So Tamas Rajas and Satva dominate the three nervous systems the parasympathetic, the sympathetic and the central nervous system. And the Hatayogis bring about the required changes of the gunas by manipulating the tone of the three systems by unique yogic procedures of Sarvangasana Sirsasana and Pranayama. 因此由惰性，激性以及悦性占主导的三种神经系统分别是副交感神经系统，交感神经系统以及中枢神经系统。同时哈他瑜伽士提出了如何通过肩倒立，头倒立以及呼吸控制法等特殊的瑜伽程序来控制三种神经系统的品质，由而带出三德所需要的改变。 |
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