Abstract

Background: Cardiovascular diseases (CVDs) are the primary cause of illness and death worldwide. Recent studies have indicated that yoga may be an effective non-drug intervention with positive effects on heart health. Objective: This article aims to investigate how yoga influences heart-related physiological functions and its potential as a complementary approach to cardiac rehabilitation. Methods: A comprehensive review of the literature was performed using databases like PubMed, Google Scholar, Embase, and the Cochrane Library. The search included studies and reviews published up to 2024, focusing on the cardiovascular effects of yoga. Results: Yoga improves cardiovascular metrics by lowering systemic inflammation and psychological stress while regulating the autonomic nervous system. It leads to lower blood pressure, decreased resting heart rate, enhanced heart rate variability, and better cardiovascular resilience. Mindfulness and yogic breathing improve circulation and reduce the risk of hypertension, stroke, and cardiac arrest. Deep breathing increases oxygen intake, promoting efficient nutrient delivery. Yoga helps alleviate circulatory problems like hypertension, muscle stiffness, and coronary blockages. Vigorous yoga can raise heart rate and cardiac output, increasing systolic blood pressure. Conclusion: Yoga is increasingly acknowledged as a beneficial lifestyle change for improving heart health and addressing cardiac issues. However, the effects of yoga on risk factors associated with cardiovascular disease (CVD) are not consistently evident in various studies, highlighting the need for further investigation.

Keywords

Autonomic Dysfunction, Cardiac Rehabilitation, Cardiovascular Diseases, Meditation, Yoga, Yogic Diet

Introduction

Cardiovascular diseases (CVD) continue to be the leading cause of death worldwide, including in India.¹^˒² Research highlights that CVD affects the Indian population approximately ten years earlier than it does Europeans.^3,4 Statistics show that approximately 52% of deaths related to cardiovascular issues in India occur in people younger than 70 years, compared with only 23% in Western nations.⁵ According to the World Health Organization

(WHO) global report on non-communicable diseases,

17.3 million deaths in 2008 were due to cardiovascular causes, with 7.3 million from heart attacks and 6.2 million from strokes.² Additionally, countries with lower income levels, such as India, experience a higher rate of cardiovascular death than those with middle or high incomes.⁶^˒⁷ Although the exact reasons for this difference are not fully understood, a combination of biological factors and social determinants, along with their interactions, likely play a role. This increasing mortality trend represents a growing socioeconomic challenge for India’s healthcare system and calls for the development of focused, sustainable intervention strategies.⁸

Risk factors and the need for integrated interventions

Hyperlipidaemia, a major factor in the onset of atherosclerosis and diabetes, has become more common owing to factors such as lack of physical activity, poor eating habits, mental stress, and aging.^9,10 A 2016 report from the Lipid Association of India pointed out a troubling increase in early-onset atherosclerotic cardiovascular disease.^11,12 Traditional risk factors for CVD include high cholesterol levels, poor diet, sedentary behavior, and smoking.¹³ Although pharmaceutical and surgical treatments are typically used to manage these conditions, they often fall short because of side effects, poor long-term compliance, and the inability to tackle root causes, highlighting the need for more holistic and integrative strategies, including lifestyle changes and traditional healing practices.

This article aims to investigate how yoga influences heart-related physiological functions and its potential as a complementary approach to cardiac rehabilitation.

Methods

A comprehensive review of the literature was performed using databases like PubMed, Google Scholar, Embase, and the Cochrane Library. The search included studies and reviews published up to 2024, focusing on the cardiovascular effects of yoga.

Results

The role of yoga in cardiovascular care

The Sanskrit word “Yoga” means “union,” referring to the merging of personal consciousness with universal consciousness.  It  includes  physical  poses  (asanas), breathing techniques (pranayama), and meditation (dhyana) to align the body, mind, and spirit, with the ultimate goal of achieving spiritual freedom (moksha). Yoga has its roots in India’s pre-Vedic traditions and began gaining recognition in the Western world in the late 19th and early 20th centuries. However, it has only been in the last 20 years that its therapeutic benefits have been investigated in the scientific and medical fields.¹⁴ Yoga is a cost-effective and efficient method for the management and prevention of CVD. Numerous studies have demonstrated its ability to affect key biochemical markers, such as blood glucose,¹⁵ uric acid,¹⁶ and serum protein levels,¹⁷ indicating Yoga’s crucial role in comprehensive cardiac rehabilitation.

Yoga as a primary prevention

Modern urban living contributes to cardiovascular issues such as ischemic heart disease.¹⁸ Mindfulness-Based Stress Reduction (MBSR) techniques, particularly yoga, have been linked to decreased healthcare visits among middle-income urban residents in the United States. Decreased heart rate variability (HRV) and reduced baroreflex sensitivity indicate an increased cardiovascular risk. Controlled slow breathing during yoga can restore these parameters by promoting cardiovascular balance. Mantra recitation slows breathing to approximately six breaths per minute,^19,20 thereby enhancing HRV and baroreflex function. These improvements led to reductions in respiratory rate, RR intervals on electrocardiogram (ECG), blood pressure, and cerebral blood flow. While the immediate benefits of yogic techniques on autonomic stabilization and cardiovascular function have been documented, their long-term effects on ischemic heart conditions have not been sufficiently studied. Comprehensive longitudinal studies are required to determine whether these effects persist.

The yogic effect on the human body physiology

Research supports the neurohumoral benefits of yoga, such as decreased serum cortisol, catecholamine, and aldosterone levels. The activation of these neuroendocrine pathways is characteristic of various cardiovascular diseases, including hypertension and heart failure. Yoga and meditation increase the levels of melatonin, γ-aminobutyric acid (GABA), and other neuroregulatory substances and reduce stress biomarkers such as 8-hydroxydeoxyguanosine while boosting endorphin levels, demonstrating their efficacy in mitigating psychological and physiological stress.²⁰ Consistent yoga practice reduces oxidative stress and improves endothelial function by enhancing nitric oxide bioavailability.^21,22 Evidence underscores the role of inflammation in coronary artery disease (CAD) and vascular disorders, with systemic inflammation predicting overall mortality. Yoga shows anti-inflammatory and insulin-sensitizing effects, including increased adiponectin levels and decreased leptin resistance.^23,24 Mindfulness-based meditation suppresses pro-inflammatory gene expression profiles,^25,26 and yogic meditation is linked to the downregulation of nuclear factor-κB-mediated transcription  of  inflammatory  cytokines.²⁷  A  study investigated cardiovascular, endocrine, and inflammatory responses in novice and experienced yoga practitioners before, during, and after Hatha Yoga, comparing them with light walking and passive rest. Experienced practitioners exhibited significantly lower interleukin-6 (IL-6) levels, whereas novices were 4.8 times more likely to show elevated high-sensitivity C-reactive protein (hs-CRP) levels.²⁸ A meta-analysis of 34 studies on mind-body interventions found that such practices reduce inflammatory biomarkers and enhance cell-mediated immune responses, although this analysis was not limited to yoga intervention.²⁹

Yogic effect in modifying coronary risk factors

In contemporary practice, pharmacological treatment remains the primary strategy for hypertension control. Many antihypertensive medications have side effects that can affect patient adherence and treatment success. Moderate-intensity aerobic exercise, such as brisk walking for 30–45 minutes 4–5 times weekly at 40–60% of peak oxygen uptake, reduces blood pressure. It is important to note that although aerobic exercise influences blood pressure management, its impact is less significant than that of medication. A randomized controlled trial (RCT) showed that an 11-week intervention of daily yoga practice, with each session lasting one hour, can be as effective as pharmacological therapy in managing hypertension.^30-31 Yoga, combined with relaxation training, biofeedback, transcendental meditation, and psychotherapy, has demonstrated significant antihypertensive effects. The mechanisms by which yoga lowers blood pressure involve improvements in the autonomic nervous system function. A reduction in the baroreflex sensitivity contributes to the development of essential hypertension,³² the yoga postures, especially inverted or inclined positions, enhance the baroreflex sensitivity. A three-week program incorporating specific yogic postures resulted in autonomic modulation, confirmed through physiological assessments, including cold pressor response (CPR) at 41°C, electroencephalographic alpha index (AI), plasma catecholamine (CA) levels, and plasma renin activity (PRA). These evaluations showed a decrease in sympathoadrenal and renin–angiotensin system activity during yoga practice. Important to note that improvement in baroreceptor sensitivity has been associated with reduced blood pressure in yoga practitioners. In addition to managing primary hypertension, yoga effectively reduces secondary cardiovascular complications associated with chronic high blood pressure. Left ventricular hypertrophy (LVH), a result of prolonged hypertension, indicates various cardiac disorders, including myocardial ischemia, congestive heart failure, and diastolic dysfunction. The head-down-body-up yoga posture, sarvangasana (shoulder stand), has shown clinical benefits in preventing hypertension-induced left ventricular hypertrophy (LVH) and diastolic dysfunction. A two-week sarvangasana intervention led to significant reductions in resting heart rate and left ventricular end-diastolic volume, with a modest decrease in left ventricular mass, as observed through echocardiographic evaluation.³⁴

Yogic effect on serum lipid profile and body weight

Obesity is recognized as a major independent risk factor for ischemic heart disease and the associated risk of hypertension. Despite significant efforts, losing weight and maintaining weight often prove difficult and frequently yield less than ideal outcomes. Yoga has gained attention as an effective method to address obesity. A randomized controlled trial found that one year of regular yoga practice resulted in notable improvements in body weight management and composition.³⁵ In another study, participants in an intensive three-month residential yoga and meditation program showed significant reductions in body mass index (BMI), total serum cholesterol, low-density lipoprotein (LDL) cholesterol, and fibrinogen levels, especially in those with high initial values.³⁶ The positive effects of yoga on obesity and hyperlipidaemia cannot be attributed solely to calorie burning, because the physical practice of asanas typically does not involve intense or rapid muscle exertion, instead, the therapeutic benefits of yoga likely stem from its overall impact on metabolic regulation, endocrine function, and stress reduction, making it a valuable nonpharmacological strategy for managing obesity and lipid disorders.

Yogic effect on intrinsic adverse neurohormonal activity

Increased intrinsic neurohormonal activity has been linked to heightened vulnerability to ischemic heart disease, which may clarify how life stressors elevate the risk of cardiac conditions. The extent of detrimental neurohormonal activity can be measured by evaluating specific markers in the blood and urine. Individuals who consistently engage in yoga asanas have shown a notable decrease in markers of intrinsic neurohormonal activity, such as urinary excretion of adrenaline, noradrenaline, dopamine, and aldosterone, as well as blood levels of testosterone and luteinizing hormone. An experimental study revealed an increase in urinary cortisol excretion.³³ Yoga-based guided relaxation has been found to lower sympathetic activity, as indicated by reductions in heart rate, skin conductance, and oxygen consumption, along with an increase in breath volume, clinical signs of neurohormonal activity, thus offering a protective effect against ischemic heart disease and myocardial infarction.³⁷

Yogic effect on diabetes mellitus

 Yoga has been identified as a cost-effective and beneficial therapeutic method that can complement the treatment for non-insulin-dependent (type II) diabetes mellitus (NIDDM). Among patients with diabetes who consistently practiced yoga, there was a notable decrease in the occurrence of hyperglycemia and a reduction in the overall area under the curve in the oral glucose tolerance test. This experimental research indicated a reduced necessity for oral hypoglycemic medications to achieve proper blood sugar control in those who practiced yoga.³⁸ However, the exact mechanism by which yoga exerts its antiglycemic effects is still not fully understood. It is possible that a neurohormonal regulatory mechanism involving insulin and glucagon may be involved.

Yoga intervention as an alternative to cardiac rehabilitation programme

Cardiac rehabilitation (CR) has been proven to significantly decrease the illness and death rates in individuals with coronary artery disease. However, implementing CR often poses financial difficulties owing to its multidisciplinary approach, which involves services from trained nurses, physiotherapists, cardiologists, and other specialists. In addition, CR programs are not widely available in India, with particularly low participation rates. According to the 2020 global audit by the International Council of Cardiovascular Prevention and Rehabilitation, only one CR spot is available for every

360 patients with ischemic heart disease each year in India, highlighting a shortfall of approximately 3,304,474 places annually.³⁹ The main obstacles to accessing CR include financial limitations and a lack of patient referrals, with the demand for such programs being most significant in the northern regions of the country. Yoga has emerged as a promising alternative to traditional cardiac rehabilitation (CR) in India for several reasons. First, yoga is widely accepted and popular throughout the

country, making it a more accessible and culturally acceptable form of physical activity than conventional rehabilitation exercise. Second, yoga is cost-effective and requires minimal infrastructure or equipment, and only a trained instructor is necessary. Third, the presence of numerous yoga institutions with qualified professionals enables scalable implementation. Moreover, yoga is suitable for home-based practice, and recent advancements in tele-yoga have shown promise in terms of its feasibility, effectiveness, and safety.⁴⁰ Ongoing research continues to explore the potential of tele-yoga to expand the reach of rehabilitation services.⁴¹

In recent years, the resurgence of yoga in India, supported by significant governmental promotion and funding, has established it as a viable component of the national health care framework. Unlike traditional physical training, yoga offers holistic benefits that enhance physical, emotional, and mental well-being. This is particularly relevant given the high prevalence of psychological distress, such as stress, depression, and anxiety, among patients with cardiac diseases. Yoga’s comprehensive approach effectively addresses these concerns; furthermore, yoga practices can be tailored to accommodate various physical capacities. Pranayama provides low-intensity engagement, Vinyasa Yoga offers moderate-intensity exercise, and dynamic Surya Namaskar sequences deliver high-intensity physical activity.⁴² This adaptability facilitates the development of individualized rehabilitation plans based on patient needs and clinical status. Numerous clinical and observational studies have documented positive outcomes associated with yoga and lifestyle modifications in the management and prevention of cardiovascular diseases. These studies demonstrated improvements in key cardiovascular risk parameters, including blood pressure, lipid profile, heart rate variability, and psychological health (Table 1). An Integrated Yoga Protocol for Cardiovascular Diseases (IYPCD) was developed by incorporating evidence-based yogic practices specifically designed for cardiac care (Table 2). This protocol integrates structured physical postures, breathing exercises, meditative techniques, and a Yogic Diet to provide a comprehensive and sustainable model for cardiac rehabilitation and promotion of long-term cardiovascular health.

Discussion

Stress is a constant and unavoidable part of everyday life and plays a significant role in the development of various health issues, particularly coronary heart disease (CHD). Research involving patients with heart disease has shown a significant decrease in clinic visits among those who consistently engage in yoga. Yoga and Pranayama offer considerable health advantages mainly by influencing the hypothalamic–pituitary–adrenal (HPA) axis, which is crucial in stress-related conditions such as type 2 diabetes mellitus (T2DM) and CVD.¹⁸These practices have demonstrated beneficial effects in a range of conditions, such as hypertension, by increasing the parasympathetic activity through vagus nerve stimulation. This process helps to reduce coronary atherosclerosis and enhance lipid metabolism, body weight, and cholesterol management.⁵² Moreover, yoga improves cardiopulmonary function and boosts physical endurance. It is linked to neuroendocrine regulation relevant to cardiovascular health, marked by decreased sympathetic activity and heightened parasympathetic responses, which improve physical performance and lower levels of inflammatory biomarkers, such as interleukin-6 (IL-6). These physiological changes provide both subclinical and clinical benefits, including lower resting heart rate, higher high-density lipoprotein (HDL) levels, reduced low-density lipoprotein (LDL) levels, less plaque build-up, and fewer arrhythmic episodes requiring revascularization procedures. ⁵³ Supporting these results, a 2016 study of 30 medical students aged 18–21 practicing Sudarshan Kriya Yoga for three months showed significant decreases in mean arterial pressure, blood glucose levels, and serum cholesterol levels.⁵⁴

Numerous clinical and observational studies (Table 1) have consistently highlighted the positive effects of yoga and lifestyle changes in preventing and managing CVD. These studies underscore yoga’s potential not only as a complementary therapy but also as a cost-effective and

accessible alternative to traditional cardiac rehabilitation, especially in the Indian healthcare setting. Physiologically, the regular practice of asanas and pranayama has been shown to regulate blood pressure, enhance heart rate variability, reduce systemic inflammation, and improve endothelial function. Psychologically, practices such as meditation, yoga nidra, and guided relaxation significantly alleviate stress, anxiety, and depression, which are major contributors to cardiovascular risk.^55,56,57 Additionally, yoga-inspired lifestyle changes such as adopting a sattvic (balanced) diet, improved behavioral discipline, and mindful living have been linked to better smoking cessation outcomes, weight management, and lipid profile improvement. The IYPCD provides a comprehensive and structured approach that incorporates these multidimensional benefits, making it suitable for the primary, secondary, and tertiary rehabilitation of cardiovascular conditions (Table 2).

In the realm of primary prevention, yoga has gained recognition as a culturally accepted and economical tool for promoting public health education, especially for stress management, balanced nutrition, and physical activity. Introducing yoga into school programs and workplace wellness initiatives can help instill healthy habits at a young age. Community-based efforts, such as weekly yoga sessions, nutritional counselling, and screening for risk factors such as hypertension and obesity, further extend preventive measures. A yogic diet, rich in fibre, antioxidants, and plant-based foods, can greatly reduce the risk of atherosclerosis.⁵⁸ In terms of secondary prevention, implementing the IYPCD immediately after a cardiac event, such as angina or a mild heart attack, helps manage risk factors and aids recovery. Pranayama and yoga nidra are effective for stress management and prevention of recurrence, while regular monitoring of blood pressure, glucose, and lipid levels, along with yogic dietary advice, improves disease management. Additionally, incorporating yoga into non-invasive cardiac care and outpatient settings enhances recovery protocols.⁵⁹ For tertiary prevention, consistent with the IYPCD protocol, patients need to engage in self-care practices, such as pranayama, mindful eating, and adherence to daily routines (Dinacharya).⁶⁰ When combined with suitable dietary and lifestyle changes, yoga provides a holistic, sustainable, and culturally relevant method for improving cardiovascular health. The IYPCD model offers a promising, scalable, and cost-effective strategy for tackling India’s growing burden of CVD, and could be considered for inclusion in future public health policies and hospital-based care systems in India.

Conclusion

Mind-body practices, such as yoga, combine continuous physical activity with a concentrated inward focus, promoting a temporary state of self-awareness and reflection. Such practices have been shown to offer notable psychological and physiological advantages. Specifically, yoga is believed to trigger neurohormonal responses that enhance health outcomes, as indicated by a reduction in sympathetic nervous system activity associated with regular practice. Despite these recognized benefits, there is a significant need for systematic scientific research to clarify the specific effects and biological mechanisms through which yoga affects human health in both healthy and diseased states. Yoga has gained recognition as a promising lifestyle intervention that can be effectively incorporated into strategies to prevent and manage CVD. Its wide-ranging benefits, including physiological improvements in blood pressure control, lipid profiles, and autonomic function, as well as psychological benefits, such as stress reduction and emotional resilience, make it particularly suitable for comprehensive cardiac care. Although yoga’s global popularity and cultural significance, especially in India, are increasing, evidence regarding its impact on specific cardiovascular risk factors remains inconsistent. These inconsistencies may stem from variations in study design, yoga protocols, population characteristics, and intervention duration. Therefore, while current research strongly indicates the potential of yoga to modify key CVD risk factors such as hypertension, dyslipidaemia, obesity, and stress, more rigorous, standardized, and long-term studies are needed to systematically assess its effectiveness across diverse patient groups. A thorough analysis of the effects of yoga on individual cardiovascular risk factors is crucial to fully comprehend its mechanisms and optimize its use in clinical and public health settings. Incorporating yoga into national cardiovascular health programs, supported by evidence-based protocols such as the IYPCD, could provide a sustainable, cost-effective, and culturally appropriate solution to the growing burden of cardiovascular disease.

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