Health Benefits Of Yoga

Chronic Backpain

When doctors at the HMO Group Health Cooperative in Seattle pitted 12 weekly sessions of yoga against therapeutic exercises and a handbook on self-care, they discovered the yoga group not only showed greater improvement but experienced benefits lasting 14 weeks longer. A note of caution: "While many poses are helpful, seated postures or extreme movement in one direction can make back pain worse," says Gary Kraftsow, author of Yoga for Wellness, who designed the program for the study.

Depression

Low brain levels of the neurotransmitter GABA are often found in people with depression; SSRIs, electroconvulsive therapy, and now yoga, it seems, can boost GABA. Preliminary research out of the Boston University School of Medicine and Harvard's McLean Hospital found that healthy subjects who practiced yoga for one hour had a 27 percent increase in levels of GABA compared with a control group that simply sat and read for an hour. This supports a growing body of research that's proving yoga can significantly improve mood and reduce the symptoms of depression and anxiety.

Yoga and Diabetes

Speeds Nerve Impulses

One of the major problems from long term diabetes is nerve damage due to constant high sugar levels in the body. This nerve damage leads to the slowing of nerve impulses, decreased sensation, numbness of the feet, and poor bowel function. Can yoga help? Scientists at Guru Tegh Bahadur Hospital, in Delhi, India, studied a group of 20 type 2 diabetic subjects between the ages of 30-60 years. Their aim was to see whether Yoga asanas had any effect on nerve conduction. TheYoga asanas included Suryanamskar Tadasan, Konasan, Padmasan Pranayam, Shavasan, Pavanmukthasan, Sarpasan and Shavasan. The Yoga exercises were performed for 40 minutes every day for 40 days in the above sequence. The subjects continued their normally prescribed medicines and diet. Blood sugar and nerve conduction velocity of the median nerve (in the hand) were measured and repeated after 40 days of the Yogic regime. Another group of 20 type 2 diabetes subjects of comparable age and severity, called the control group, were kept on prescribed medication and light physical exercises like walking. Their initial & post 40 days parameters were recorded for comparison.
At the end of the 40 days, those who did the yoga had improved the nerve impulse in their hands. The hand nerve conduction velocity increased from 52.8 meters per second to 53.8 m/sec. The control group nerve function deteriorated over the period of study, indicating that diabetes is a slowly progressive disease involving the nerves. The authors conclude that Yoga asanas have a beneficial effect on blood sugar control and improve nerve function in type 2 diabetics who have mild nerve damage. Dr. Sahelian says: In addition to Yoga, I recommend my patients with diabetes take a nutrient called lipoic acid which has also been found to improve nerve function in diabetics.

Yoga Lowers Blood Sugar in Diabetics

Certain yoga asanas, if practiced regularly, are known to have beneficial effects on human body. Researchers at the University College of Medical Sciences, in Shahdara, New Delhi evaluated 24 patients aged 30 to 60 year old who had non-insulin dependent diabetes mellitus, also called Type II diabetes. Diabetics who require insulin are called Type I, while Type II diabetics are treated with diet, exercise, and oral medicines that lower blood sugar. The researchers evaluated the baseline fasting blood sugar levels of the patients, and they also performed pulmonary function studies. These pulmonary function studies measure lung capacity and the amount of air that can be exhaled within the first second of a rapid exhale.
After performing these basic tests, yoga experts gave these patients training in yoga asanas. The yoga practice was done 40 minutes a day for 40 days. These asanas consisted of 13 well known and common postures, done in a sequence. After 40 days of yoga asanas regimen, the testing was repeated. The results indicate that there was significant decrease in fasting blood sugar levels from about 190 initially to 140 after the 40 day period of yoga activity. Fasting blood sugar in people without diabetes is usually below 120. The lung studies showed an average improvement of about 10 percent in lung capacity. These findings suggest that better blood sugar control and pulmonary functions can be obtained in type I diabetics when they stick to a daily schedule of yoga asanas and pranayama.
The exact mechanism as to how these postures and controlled breathing interact with physio-neuro-endocrine mechanisms affecting blood sugar and pulmonary functions remains to be worked out.

Menopause

A preliminary study at the University of California, San Francisco, found that menopausal women who took two months of a weekly restorative yoga class, which uses props to support the postures, reported a 30 percent decrease in hot flashes. A four-month study at the University of Illinois found that many women who took a 90-minute Iyengar class twice a week boosted both their energy and mood; plus they reported less physical and sexual discomfort, and reduced stress and anxiety.

Stress Management and Relaxation

Using Yoga to Relieve Stress

To combat stress, many people turn to meditation or other mental stress reduction tools. But stress also creates physical response in the body and, as such, can be managed with exercise -- in particular, with yoga.
"Stress sends the entire physical system into overdrive," says Garrett Sarley, president and CEO of the Kripalu Center for Yoga & Health in Lenox, Mass. "The muscles tense, the heart beats faster, breathing patterns change, and if the cause of stress isn't discontinued, the body secretes more hormones that increase blood sugar levels, raising blood pressure. Yoga is one of the few stress-relief tools that has a positive effect on all the body systems involved."
Recognizing the detrimental effects of stress, especially in the area of heart disease, the preventive and rehabilitative cardiac center at Cedars-Sinai Medical Center in Los Angeles began offering yoga to their patients more than 10 years ago.
"Over the years, yoga has become one of our primary therapies for stress management," says C. Noel Bairey Merz, M.D., director of the preventive and rehabilitative cardiac center at Cedars-Sinai Medical Center.

Yoga-based guided relaxation reduces sympathetic activity judged from baseline levels.

35 male volunteers whose ages ranged from 20 to 46 years were studied in two sessions of yoga-based guided relaxation and supine rest. Assessments of autonomic variables were made for 15 subjects, before, during, and after the practices, whereas oxygen consumption and breath volume were recorded for 25 subjects before and after both types of relaxation. A significant decrease in oxygen consumption and increase in breath volume were recorded after guided relaxation (paired t test). There were comparable reductions in heart rate and skin conductance during both types of relaxation. During guided relaxation the power of the low frequency component of the heart-rate variability spectrum reduced, whereas the power of the high frequency component increased, suggesting reduced sympathetic activity. Also, subjects with a baseline ratio of LF/HF > 0.5 showed a significant decrease in the ratio after guided relaxation, while subjects with a ratio < or = 0.5 at baseline showed no such change. The results suggest that sympathetic activity decreased after guided relaxation based on yoga, depending on the baseline levels.
Psychol Rep 2002 Apr;90(2):487-94 Related Articles, Links. Swami Vivekananda Yoga Research Foundation, Chamarajpet, Bangalore, India.

Asthma and Breathing

Asthma is a lung condition involving chronic inflammation of the airways (bronchi) which can narrow and go into spasms. During asthma attacks, the smooth muscle cells in the bronchi constrict, the airways become inflamed and swollen, and breathing becomes difficult.

Symptomatic control of episodes of wheezing and shortness of breath is generally achieved with fast-acting bronchodilators.

A study of the effect of yoga training on pulmonary functions in patients with bronchial asthma.
Indian J Physiol Pharmacol. 2009 Apr-Jun; Sodhi C, Singh S, Dandona PK. Department of Physiology, Christian Medical College, Ludhiana - 141 007.
The role of yoga breathing exercises, as an adjunct treatment for bronchial asthma is well recognized. One hundred twenty patients of asthma were randomized into two groups i.e Group A (yoga training group) and Group B (control group). Each group included sixty patients. Pulmonary function tests were performed on all the patients at baseline, after 4 weeks and then after 8 weeks. Majority of the subjects in the two groups had mild disease (34 patients in Group A and 32 in Group B). Group A subjects showed a statistically significant increasing trend in % predicted peak expiratory flow rate (PEFR), forced expiratory volume in the first second (FEV1), forced vital capacity (FVC), forced mid expiratory flow in 0.25-0.75 seconds (FEF25-75) and FEV1/FVC% ratio at 4 weeks and 8 weeks as compared to Group B. Thus, yoga breathing exercises used adjunctively with standard pharmacological treatment significantly improves pulmonary functions in patients with bronchial asthma.

Obesity

Obesity rates in the United States have reached epidemic proportions: 58 Million Overweight; 40 Million Obese; Eight out of 10 adults over age 25 Overweight; 78% of American's not meeting basic activity level recommendations; 25% completely Sedentary; 76% increase in Type II diabetes in adults 30-40 yrs old since 1990; In 2001 25% of all white children and 33% of African American and Hispanic children were overweight.
Solution: Vigorous Power, Vinyasa, or Ashtanga yoga classes done for 90 minutes at least 3-5 times a week will produce weight loss. Yoga keeps people more in tune with their bodies making them aware of aware of bad habits, such as eating because of stress, boredom or depression. The first study investigating the effects of yoga on weight was recently conducted by the Fred Hutchinson Cancer Research Center in Seattle, WA.
General Stats: According to the Centers for Disease Control and Prevention, 16 percent of children (over 9 million) 6-19 years old are overweight or obese -- a number that has tripled since 1980. In addition to the 16 percent of children and teens ages 6 to 19 who were overweight in 1999-2002, another 15 percent were considered at risk of becoming overweight. ("Prevalence of Overweight and Obesity Among Children and Adolescents: United States, 1999-2002"; Oct. 6, 2004)
According to the Centers for Disease Control and Prevention, over the past three decades the childhood obesity rate has more than doubled for preschool children aged 2-5 years and adolescents aged 12-19 years, and it has more than tripled for children aged 6-11 years. ("Prevalence of Overweight and Obesity Among Children and Adolescents: United States, 1999-2002"; Oct. 6, 2004)

Heart Disease

Lower blood pressure, cholesterol, heart rate and other heart disease symptoms

Several trials have found that yoga can lower blood pressure, cholesterol, and resting heart rates, and help slow the progression of atherosclerosis—all risk factors for heart disease, says Erin Olivo, PhD, director of Columbia University's Integrative Medicine Program.
While almost any exercise is good for the heart, experts speculate yoga's meditative component may give it an extra boost by helping to stabilize the endothelium, the lining of the blood vessels that, when irritated, contributes to cardiovascular disease. Since the lining is reactive to stress, and meditation can lower stress hormones, yoga may be causing a cascade of events that could reduce your risk of a heart attack or stroke.

Retardation of coronary atherosclerosis with yoga lifestyle intervention.

Yoga has potential for benefit for patients with coronary artery disease though objective, angiographic studies are lacking. We evaluated possible role of lifestyle modification incorporating yoga, on retardation of coronary atherosclerotic disease. In this prospective, randomized, controlled trial, 42 men with angiographically proven coronary artery disease (CAD) were randomized to control and yoga intervention group and were followed for one year. The active group was treated with a user-friendly program consisting of yoga, control of risk factors, diet control and moderate aerobic exercise. The control group was managed by conventional methods i.e. risk factor control and American Heart Association step I diet. At one year, the yoga groups showed significant reduction in number of anginal episodes per week, improved exercise capacity and decrease in body weight. Serum total cholesterol, LDL cholesterol and triglyceride levels also showed greater reductions as compared with control group. Revascularisation procedures (coronary angioplasty or bypass surgery) were less frequently required in the yoga group. Coronary angiography repeated at one year showed that significantly more lesions regressed (20% versus 2%) and less lesions progressed (5% versus 37%) in the yoga group. The compliance to the total program was excellent and no side effects were observed. : Yoga lifestyle intervention retards progression and increases regression of coronary atherosclerosis in patients with severe coronary artery disease. It also improves symptomatic status, functional class and risk factor profile.
The overall benefits of yoga on risk factors for heart disease were evaluated by researchers at Bhabha Atomic Research Centre, Medical Division, in Mumbai, India. (Mumbai is the new name for the city formely known as Bombay. The name was changed in the mid 1990s. The effect of yoga on the body, psychological well being, and cardiovascular risk factors was studied in a group of middle aged patients. Twenty patients (16 males, 4 females) in the age group of 35 to 55 years with mild to moderate high blood pressure underwent yogic practices daily for one hour for three months. High blood pressure is a risk factor for heart disease, stroke, and kidney damage. Biochemical and psychological parameters were studied prior and following period of three months of yoga. These biochemical parameters included blood sugar, lipid profile including cholesterol, and blood levels of catecholmines (stress chemicals like epinephrine or adrenaline). The overall results were quite positive. There was a decrease in blood pressure along with a decrease in blood sugar, cholesterol and triglycerides. The patients also reported an improvement in overall well being and quality of life. There was also a decrease in the levels of catecholamines, suggesting a decrease in sympathetic activity. A decrease in sympathetic activity indicates that the patients were calmer and experienced less tension and stress, and that their blood pressure would be lower. The authors of the study conclude that yoga can play an important role in decreasing the risk factors for cardiovascular disease in those with mild to moderate hypertension.
Heart rate variability, a sign of a healthy heart, has been shown to be higher in yoga practitioners than in non-practitioners, according to research in the International Journal of Medical Engineering and Informatics. The autonomic nervous system regulates the heart rate through two routes — the sympathetic and parasympathetic nervous systems. The former causes the heart rate to rise, while, the parasympathetic slows it. When working well together, the two ensure that the heart rate is steady but ready to respond to changes caused by eating, the fight or flight response, or arousal.
J Assoc Physicians India 2000 Jul;  Manchanda SC, Narang R, Reddy KS, Sachdeva U, Prabhakaran D, Dharmanand S, Rajani M, Bijlani R. All India Institute of Medical Sciences, New Delhi, India.