I am adding my comment to this question (for reference only) based on all similar questions which I have answered similarly to them:
During any breathing exercise of pranayama like anulom - vilom pranayama, bhastrika or kapalabhati, sometimes there may be hyperventilation that sets in, disturbing the balance of breathing in oxygen and breathing out carbon dioxide leading to a rapid reduction in carbon dioxide in the body. Low carbon dioxide levels lead to narrowing of the blood vessels that supply blood to the brain. This reduction in blood supply to the brain leads to symptoms like light headedness and vibrational sensation of tingling in the limbs. So, if such symptoms appear, immediately stop the breathing exercises, else severe hyperventilation can lead to loss of consciousness. Make sure to let your physician know if you have recurring symptoms.
Light headedness, dizziness and tingling on the face after any yogic exercise may also be because of the presence of dehydration, low blood sugar, a pinched nerve, etc. Some of these conditions can cause severe, even fatal, complications if they are not remedied immediately.
Low Blood Sugar - In case of low blood sugar, eating a meal about three hours before your workout or eating a small snack an hour before exercise can help.
Pinched Nerve - Pinched Nerve due to any continuously prolonged position may also cause light headedness and / or tingling on the face. In that case, stop the yogic exercise immediately. In that case, first, rest, hydrate and fuel your body with healthy food options to help it repair.
Feeling vibrations in the body in the limbs may be the sensation of tingling or numbness which is usually a sign that blood flow to the nerves is being blocked. It generally happens that when you perform sustained movements for several minutes like maintaining yoga position wherein blood flow can slow down in some of your body parts (depending on the exercise like leg, arms, etc.) due to which numbness and tingling sensations in those parts occur. During an intense workout, up to 85 percent of your blood is directed to your working muscles, and your blood vessels expand to accommodate the increased flow. In addition, tight shoes or clothing also restricts your blood flow and lead to a tingling sensation.
This also happens due to pressure on nerves like when your arm is crooked under your head as you fall sleep, or when you cross your legs too long. In such cases, this numbness / tingling sensations are soon relieved from removing the pressure that caused them. This is also called Paresthesia.
Similarly, another reason can also be a herniated disk in your spine which may lead to numbness in the leg, which may also hinder mobility and balance.
Most of the time, tingling in the legs after exercise is benign and will resolve after a few minutes of rest. The most common cause of tingling in the legs are muscles that are depleted of nutrients due to dehydration and/or electrolyte imbalances.
As soon as you feel some numbness and a tingling sensation in your arms/legs, stop the yogic exercise immediately. Change the position to improve blood flow to the area of tingling sensation. Loosen or remove any tight clothing or pants you may be wearing.
If the tingling is minor and doesn't bother you, it's just fine to go about your day. In that case, first, rest, hydrate and fuel your body with healthy food options to help it repair. Massages, alternating hot and cold showers or icing muscles can also reduce the muscle swelling that can make your legs feel tingly.
But if your tingling doesn't go away after a reasonable amount of time — say, an hour or so after you stop exercising — it's important to consult with your physician if such symptoms are chronic or episodic or severe or without any above-mentioned cause of exercise, as it then may be a sign of pinched nerve, carpel tunnel syndrome or sometimes diabetes.
Dehydration - During intense yogic exercise or pranayama, there is loss of considerable amount of fluids through perspiration which can lead to a drop in blood pressure causing light headedness and tingling in your face. During such dehydration, there is dryness in throat and sweating is reduced. In that case, intake of fluids will help.
Overexertion: Also check if you are over exerting. Pushing too hard during your workout can cause your blood pressure to drop or result in dehydration. This can leave you feeling lightheaded, dizzy, or faint. If you’re feeling dizzy, take a minute to cool down, catch your breath, and slow your heart rate. Drink slowly as much water as possible to rehydrate your depleted muscles. Trying to do too much too fast can do more harm than good, so listen to your body and do so slowly over time.
Just remember not to go beyond your capacity during any exercise, asana or pranayama. Do it slowly and not continuously for a long time, within your capacity. You can also go through our presentation on basics of asanas and pranayama to have better understanding about the same.
