{"id":8020,"date":"2026-05-15T18:40:01","date_gmt":"2026-05-15T12:40:01","guid":{"rendered":"https:\/\/rmu.edu.kg\/site\/?p=8020"},"modified":"2026-05-16T18:54:01","modified_gmt":"2026-05-16T12:54:01","slug":"altitude-resistance-and-ischemic-heart-disease-physiological-adaptation-and-cardiovascular-risk","status":"publish","type":"post","link":"https:\/\/rmu.edu.kg\/site\/en\/altitude-resistance-and-ischemic-heart-disease-physiological-adaptation-and-cardiovascular-risk\/","title":{"rendered":"Altitude resistance and ischemic heart disease: Physiological Adaptation and Cardiovascular Risk"},"content":{"rendered":"

Abstract<\/strong><\/p>\n

The interplay between hypoxia-induced vascular remodeling and cardiovascular risk in populations residing in the Kyrgyz Highlands is a noteworthy phenomenon.<\/p>\n

The physiological adaptations and associated cardiovascular risks observed in Kyrgyzstan’s high-altitude environments present a distinctive case study.<\/p>\n

This study uses survey data from 200 medical students, along with regional health data, to examine the effects of low oxygen levels on heart health.<\/p>\n

A prevalence study was conducted with 200 medical students, representing the entire group. Most participants were between 21 and 23 years old (50%), and the group was made up of 55% females and 45% males. Most of the students were in their clinical years, with 46% in their fourth year and 30% in their third year. Regarding altitude, 55% lived at high altitudes (over 2500 m), and 40% lived at moderate altitudes (1000-2500 m); 46% had lived at altitude for five years or more.<\/p>\n

Notably, a significant 55% of the participants were from areas at lower altitudes, indicating a change in their environment.<\/p>\n

In addition, most participants, comprising 80% of the sample, showed an understanding of the cardiovascular risks associated with high-altitude environments. This supports the idea that reduced oxygen levels at high altitudes increase the likelihood of ischemic heart disease.<\/p>\n

Moreover, half of the participants identified several factors as causes of cardiovascular stress.These included lower oxygen levels, increased activity of the sympathetic nervous system, and higher resistance in the blood vessels of the lungs.40%\u00a0 of the participants linked atherosclerosis to problems with the endothelium, while thirty-three percent cited oxidative stress.Pulmonary hypertension emerged as the foremost risk factor, with fifty-six percent of participants acknowledging its significance.<\/p>\n

Lifestyle choices exacerbated risk, as evidenced by a high smoking rate (sixty percent current smokers) and the prevalence of non-balanced diets (fifty-five percent). Moreover, a significant sixty percent of the participants reported a family history of cardiovascular disease.<\/p>\n

Epidemiological data support these concerns.At an altitude of 3,250 meters, the average pulmonary artery pressure in individuals with high-altitude pulmonary hypertension is 34\u00b13 mmHg. This is higher than the 22\u00b15 mmHg seen in healthy high-altitude residents and the 16\u00b14 mmHg found in people living at lower altitudes.<\/p>\n

Moreover, chronic obstructive pulmonary disease (COPD) is significantly more common in high-altitude populations, with a prevalence of 36.7%, compared to 10.4% in other groups.This is linked to a higher exposure to PM2.5, with concentrations of 290 \u00b5g\/m\u00b3 compared to 72 \u00b5g\/m\u00b3.<\/p>\n

Chronic hypoxia, a condition resulting from reduced oxygen levels, causes pulmonary vasoconstriction, endothelial dysfunction, inflammation, and oxidative stress. These processes then lead to vascular remodeling and systemic complications.Although adaptive mechanisms like polycythemia and improved oxygen utilization were acknowledged (67%), these adaptations could, paradoxically, elevate blood viscosity and cardiovascular strain. While 70% of respondents believed that altitude adaptation provides cardioprotection, the findings indicate a dual effect: partial adaptation coupled with considerable cardiopulmonary risk.<\/p>\n

In conclusion, the increased cardiovascular vulnerability seen in Kyrgyz populations living at high altitudes is linked to long-term exposure.This vulnerability is caused by a combination of low oxygen levels, environmental factors, and lifestyle choices.<\/p>\n

Therefore, targeted prevention strategies and specialized medical training are essential.Keywords:- Hypoxia,pulmonary vasoconstriction, polycythemia , ischemic ,Altitude, resistance , thrombosis , cardiovascular disease .<\/p>\n

Introduction <\/strong><\/p>\n

Altitude exposure is an important environmental factor effecting human physiology.At high altitude of 2500 meters the barometric pressure reduce the partial pressure of oxygen by this as a result systemic hypoxia will occurs which will in term force the cardiovascular system to compensate to maintain adequate oxygen to delivery to body. This mechanism include increased ventilation , changes in blood composition and increase heart rate . Altitude resistance is the ability of an individual to resist the harmful effect of high altitude on body .Health individual can survive without any harmful effect on body but still high altitude poses risk of ischemic heart disease through myocardial overload , change in blood composition and change in endothelial function . So for that we should be able to understand Adaptations and risk management for individuals who come to high altitude place and work or study here eg Medical students from foreign countries coming to Kyrgyzstan which sit at high altitude for Studies .<\/p>\n

Aims and objectives <\/strong><\/p>\n

Aims<\/strong> :-<\/p>\n

To assess the level of knowledge of awareness about altitude resistance it\u2019s adaptations and risk of ischemic heart disease related to high altitude exposure among two universities students .<\/p>\n

Objectives <\/strong><\/p>\n

To assess awareness regarding the physiological adaptation mechanisms at High altitude.<\/p>\n

To determine knowledge of student regarding relation between high altitude and ischemic heart disease<\/p>\n

To assess the knowledge and awareness of students<\/p>\n

To assess the common misconception and gaps in knowledge regarding altitude related cardiovascular risks<\/p>\n

Material and Methodology <\/strong><\/p>\n

Study Design <\/strong><\/p>\n

This study was conducted as a cross sectional questionnaire based survey to determine the awareness , knowledge , adaptation regarding altitude resistance and cardiovascular risk of ischemic heart disease (IHD) among local and foreign students.<\/p>\n

Study setting <\/strong><\/p>\n

This data was collected from two Universities first one was Kyrgyz national university and second one Royal metropolitan university . Survey was conducted during weekdays to ensure easy access to participants and In Kyrgyz national university Survey was given in Russian language to ensure better understanding.<\/p>\n

Study population <\/strong><\/p>\n

Study population included\u00a0 students from Kyrgyz national university and\u00a0 students from royal metropolitan university. Participants were selected from seniors semester because they have be here long enough to have a toll on their health due to high altitude and to ensure diversity we also included a small sample population from junior semester as well.<\/p>\n

Sample size and sampling techniques <\/strong><\/p>\n

A total of 200 students participated in this study .<\/p>\n

The sampling technique used here was Convenience sampling , as the participants were approached directly on campus and were included in study based on their willingness.<\/p>\n

Inclusion criteria <\/strong><\/p>\n

Participants were included only if :-<\/p>\n

They were from these two universities<\/p>\n

They were aged between (18 to 30yrs )<\/p>\n

Voluntarily agreed to participate<\/p>\n

Consent provided<\/p>\n

Exclusion criteria <\/strong><\/p>\n

Participants were excluded only if :-<\/p>\n

They are not from These two universities<\/p>\n

Refused to participate<\/p>\n

Submitting incomplete questionnaires<\/p>\n

Study tools <\/strong><\/p>\n

Data was collected using self structured questionnaires developed by researchers.After reviewing relevant literature on physiology adaptation and risk of cardiovascular system on high altitude the questionnaires were developed.<\/p>\n

Questionnaire include 6 sections <\/strong><\/p>\n

Demographics information<\/p>\n

Knowledge of cardiovascular diseases risk at high altitude<\/p>\n

Personal risk factors<\/p>\n

Physiological adaptation to high altitude<\/p>\n

Symptoms and health monitoring<\/p>\n

Preventive measures<\/p>\n

This questionnaire include close ended questions and Multiple choice questions to make it easy for participants to respond .<\/p>\n

Data collection procedures <\/strong><\/p>\n

Researchers visited these two universities in weekdays and students were approached in common areas like library classes and ground . After telling them the purpose of study students were asked to fill out the questionnaires.<\/p>\n

The questionnaire was distributed in printed form and it was in both English and Russian language for students preference . They were given adequate time to answer to the questions and questionnaire were collected on the same day .<\/p>\n

Confidentiality was maintain and participation of students was voluntary.<\/p>\n

Variables of study <\/strong><\/p>\n

Independent <\/strong><\/p>\n

Age<\/p>\n

Gender<\/p>\n

Year of study<\/p>\n

University<\/p>\n

Lifestyle<\/p>\n

Dependents <\/strong><\/p>\n

Perception of risk at high altitude<\/p>\n

Awareness of cardiovascular adaptation<\/p>\n

Knowledge regarding this altitude resistance<\/p>\n

Ethical considerations <\/strong><\/p>\n

Ethical approval Was obtained from both universities . Participants were informed that:-<\/p>\n

Their participation was voluntary<\/p>\n

Can withdraw anytime<\/p>\n

Response will remain anonymous<\/p>\n

Data will be used for academic purposes<\/p>\n

No personal identification information was collected .<\/p>\n

Data Analysis <\/strong><\/p>\n

The data collected was entered to Google sheet for analysis .Descriptive statistics were used, including<\/p>\n

Frequencies<\/p>\n

Percentages<\/p>\n

Mean and standard deviation<\/p>\n

Results were presented in form of table charts and graphs .<\/p>\n

Results:- <\/strong><\/p>\n

Demographic Characteristics of Participants<\/p>\n

A total of 200 medical students from two universities in Kyrgyzstan participated in the study. Regarding age distribution, 50% of respondents were aged 21\u201323 years, followed by 35% aged 18\u201320 years, 10% aged 24\u201326 years, and 5% aged above 26 years. Gender distribution showed that 55% were female and 45% were male.In terms of academic year, the majority of participants were in their 4th year (46%), followed by 3rd year (30%), 5th year (15%), 1st year (5%), and 2nd year (4%).Altitude of Current Residence and Duration of Exposure.<\/p>\n

Participants reported different temporary residential altitudes in Kyrgyzstan. Most respondents (55%) lived in high-altitude areas above 2500 meters, while 40% lived in moderate altitude areas (1000\u20132500 m), and only 5% lived at low altitude (<1000 m).The duration of residence at high altitude was also assessed. Most participants had lived at high altitude for five years (46%), while 34% had lived for two to three years, 15% for more than five years, and 5% for less than one year.Before arriving in Kyrgyzstan, 55% of participants lived in low-altitude areas, 35% in moderate altitude regions, and only 10% previously lived in high-altitude regions.Perception of High Altitude and Ischemic Heart Disease Risk.<\/p>\n

When asked whether high-altitude hypoxia increases the risk of ischemic heart disease, 60% strongly agreed and 20% agreed, indicating that 80% of respondents believed that altitude hypoxia contributes to ischemic heart disease. Only 8% disagreed and 9% strongly disagreed, while 3% remained neutral.Mechanisms of Cardiovascular Stress at High Altitude.<\/p>\n

Participants identified possible mechanisms contributing to cardiovascular stress at high altitude. The most common response was \u201cAll of the above\u201d (50%), while 36% selected reduced oxygen saturation, 17% selected increased nervous system activity, and 7% chose increased pulmonary vascular resistance.Regarding mechanisms of atherosclerosis development due to chronic hypoxia, 40% selected endothelial dysfunction, 33% selected oxidative stress, 7% selected systemic inflammation, and 20% selected all of the above.High Altitude Exposure and Associated Cardiovascular Conditions.<\/p>\n

When asked which cardiovascular conditions may increase due to high-altitude exposure, the majority (56%) selected pulmonary hypertension, while 25% selected coronary artery disease, 14% selected systemic hypertension, and 5% selected all of the above.Family History and Lifestyle Risk Factors.<\/p>\n

A family history of cardiovascular disease was reported by 60% of participants, while 10% reported no family history and 30% were unsure.Regarding physical activity, 50% exercised 3\u20134 times per week, 30% exercised 5 times or more, 15% exercised 1\u20132 times, and 5% reported no exercise.Smoking or nicotine product use was common, with 45% reporting daily use, 15% reporting occasional use, and 40% reporting never using nicotine products.Dietary habits showed that 45% reported a balanced diet, while 35% consumed a high-carbohydrate diet, 15% reported a high-fat diet, and 5% reported an irregular diet.Sleep duration results showed that 56% slept 7\u20138 hours per night, 17% slept more than 8 hours, 14% slept less than 5 hours, and 13% slept 5\u20136 hours.Physiological Adaptation to High Altitude.<\/p>\n

Participants were asked about common physiological adaptations in long-term altitude residents. The most selected adaptation was increased hemoglobin concentration (45%), followed by enhanced oxygen utilization (20%), increased capillary density (15%), and 20% selecting all of the above.In terms of adaptation mechanisms helping oxygen delivery, 47% selected all of the above, 33% selected polycythemia, 13% selected increased ventilation rate, and 7% selected increased cardiac output.Protective Effect of High Altitude Adaptation Against Ischemic Heart Disease.<\/p>\n

Most participants (70%) believed that chronic exposure to high altitude may protect against ischemic heart disease due to adaptation mechanisms.However, 17% did not believe this, and 13% were unsure.When asked how adaptation may reduce cardiovascular risk, 56% selected all of the above, while 15% selected improved mitochondrial efficiency, 15% selected enhanced vascular function, and 14% selected increased nitric oxide production.Symptoms Experienced at High Altitude.<\/p>\n

Participants reported symptoms experienced at high altitude.The most commonly reported symptom was shortness of breath (40%), followed by chest discomfort (25%), palpitations (20%), while 15% reported no symptoms.Cardiovascular Screening and Preventive Strategies.<\/p>\n

Regarding cardiovascular screening (ECG, lipid profile, blood pressure measurement), 41% reported undergoing screening sometimes, 35% had never undergone screening, and 24% reported regular screening.Preventive strategies for reducing cardiovascular risk at high altitude were also assessed. 40% selected regular physical activity, 33% selected healthy diet, 6% selected blood pressure monitoring, and 21% selected all of the above.Educational Awareness and Training Needs.<\/p>\n

All participants (100%) agreed that medical students should receive specific training about high-altitude cardiovascular physiology.However, when asked if specific teaching on this topic is available in Kyrgyzstan, only 37% responded yes, while 63% responded no.<\/p>\n

Discussion <\/strong><\/p>\n

This study assess the knowledge of risk and adaptation between students of two universities regarding altitude resistance physiological adaptations and ischemic heart disease at high altitude . The results show us the different level of understanding between students from two universities..<\/p>\n

Conclusion<\/strong><\/p>\n

In Kyrgyz highland populations, chronic hypoxia orchestrates pulmonary vascular remodeling, amplified by COPD and household air pollution, culminating in elevated cardiovascular risk. The surveyed medical students demonstrate strong foundational knowledge, yet real-world translation demands integrated prevention. Longitudinal studies tracking student cohorts into practice, alongside community interventions, will be critical. With climate and migration dynamics intensifying high-altitude exposure, proactive, evidence-based strategies are urgently needed to safeguard cardiopulmonary health in these resilient yet vulnerable populations.<\/p>\n

10.References<\/strong><\/p>\n

1.D. Gilbert et al., \u201cMarkers of cardiovascular risk and their reversibility with acute hyperoxia in high\u2011altitude pulmonary hypertension,\u201d J Hypertens, 2021.<\/p>\n

2.V. M. Sydykov et al., \u201cTotal cardiovascular risk in indigenous people of Kyrgyzstan with impaired carbohydrate metabolism,\u201d High Altitude Medicine & Biology, 2018.<\/p>\n

3.N. V. Naryzhnaya et al., \u201cThe effect of an adaptation to hypoxia on cardiac tolerance to ischemia\/reperfusion,\u201d J Biomed Res, 2023.<\/p>\n

4.C. M. Percy et al., \u201cCardiovascular physiology and pathophysiology at high altitude,\u201d Front Physiol, 2024.<\/p>\n

5.R. E. Hultgreen et al., \u201cCharacterization of high\u2011altitude pulmonary hypertension in the Kyrgyz,\u201d Am J Respir Crit Care Med, 2003.<\/p>\n

6.A. A. Sydykov et al., \u201cHealthy aging and cardiovascular health in Kyrgyzstan,\u201d High Altitude Medicine & Biology, 2024.<\/p>\n

7.N. V. Naryzhnaya et al., \u201cChronic hypoxia enhances cardiac tolerance to ischemia\u2013reperfusion,\u201d J Biomed Res (PMC), 2022.<\/p>\n

8.M. J. Wilkins et al., \u201cImpact of high altitude on cardiovascular health: current perspectives,\u201d Vasc Health Risk Manag, 2021.<\/p>\n

9.J. M. Khalil et al., \u201cHypoxia\u2011induced pulmonary vascular remodeling: a model disease,\u201d Circ Res, 2000.<\/p>\n

10.A. A. Sydykov et al., \u201cHigh COPD prevalence at high altitude: does household air pollution play a role?\u201d, Eur Respir J, 2019.<\/p>\n","protected":false},"excerpt":{"rendered":"

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