Navigation Links
Cold air chills heart's oxygen supply

People with heart disease may not be able to compensate for their bodies' higher demand for oxygen when inhaling cold air, according to Penn State researchers, making snow shoveling and other activities dangerous for some.

"This study can help us understand why cold air is such a trigger for coronary events," said Lawrence I. Sinoway, Distinguished Professor of Medicine and director of the Heart and Vascular Institute, Penn State College of Medicine.

Breathing cold air during exercise can cause uneven oxygen distribution throughout the heart. But a healthy body generally corrects for this problem and redistributes blood flow, making sure the heart continues to function properly. In people with heart problems -- such as coronary artery disease -- this may not be the case, said Sinoway.

"If you are doing some type of isometric work and you're breathing cold air, your heart is doing more work -- it's consuming more oxygen," said Sinoway, also director of the Clinical and Translational Science Institute at Penn State.

Isometric work includes such activities as shoveling snow and carrying a briefcase or laptop bag. The heart works harder when exerted in cold temperatures and the number of deaths due to cardiac arrest peaks during the winter.

"There are two different things going on here -- demand and supply," said Matthew D. Muller, postdoctoral fellow at the Heart and Vascular Institute, Penn State College of Medicine. "We thought that oxygen demand in the heart would be higher with cold-air breathing and we also thought that oxygen supply would be a little bit impaired. And that's generally what we found."

Sinoway, Muller and colleagues reported their results in a recent issue of the Journal of Applied Physiology and in the current issue of the American Journal of Physiology, Heart and Circulatory Physiology.

The researchers first studied healthy young adults in their 20s and then studied a group of healthy older adults in their 60s so that they could learn how the heart functions in people without disease. Each subject was monitored for lung function and heart functions during the trials.

In order to measure heart function during exercise, the participants performed an isometric, or static, handgrip, which is a maneuver known to increase blood pressure. Subjects squeezed the handgrip device and held it still for two minutes, providing a consistent workload on the heart for the researchers to measure. Muller and Sinoway found that there was a supply-demand mismatch in the left ventricle -- where the heart receives oxygenated blood -- yet the heart was able to continue functioning appropriately.

These findings "suggest that healthy humans can adequately redistribute blood to the subendocardium (the blood vessels entering the heart) during the combined stimulus of cold-air inhalation and handgrip exercise," the researchers stated.


Contact: Victoria M. Indivero
Penn State

Related medicine news :

1. “Hearts and Minds” Education Program Launched: On Average, People with Mental illness Live 25 Years Less than Other Americans
2. Hearts of Hospice Patients Being Needlessly Shocked
3. Healing Wounds and Hearts: Warrior Weekend Helps Soldiers and Marines Relax and Recover
4. Researchers discover chemical that may protect hearts of muscular dystrophy patients
5. Hearts and Minds Promotes Wellness; African Americans Living with Mental Illness Have Higher Risk for Other Illnesses.
6. Tiny Fish Might Help Humans Fix Damaged Hearts
7. Mans Best Friend Helps Mend Broken Hearts
8. Stem cells from surgery leftovers could repair damaged hearts
9. High-Stress Jobs Tax Womens Hearts, Too
10. 2 BigHearts Board Announces Addition to Board of Directors: Michael Unetich
11. Hostile, Competitive Types May Be Harming Their Hearts
Post Your Comments:
(Date:6/26/2016)... Carolina (PRWEB) , ... June 26, 2016 , ... ... of a new product that was developed to enhance the health of felines. The ... centuries. , The two main herbs in the PawPaws Cat Kidney Support ...
(Date:6/25/2016)... ... June 25, 2016 , ... Austin residents seeking Mohs surgery services, can ... Surgery and to Dr. Russell Peckham for medical and surgical dermatology. , Dr. Dorsey ... cancer. The selective fellowship in Mohs Micrographic Surgery completed by Dr. Dorsey was under ...
(Date:6/25/2016)... , ... June 25, 2016 , ... As a lifelong ... Cum Laude and his M.D from the David Geffen School of Medicine at UCLA. ... to Los Angeles to complete his fellowship in hematology/oncology at the UCLA-Olive View-Cedars Sinai ...
(Date:6/24/2016)... ... 24, 2016 , ... A recent article published June 14 on ... article goes on to state that individuals are now more comfortable seeking to undergo ... such as calf and cheek reduction. The Los Angeles area medical group, Beverly Hills ...
(Date:6/24/2016)... , ... June 24, 2016 , ... ... and Scientific Sessions in Dallas that it will receive two significant new grants ... grants came as PHA marked its 25th anniversary by recognizing patients, medical professionals ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... 2016 Capricor Therapeutics, Inc. ... biotechnology company focused on the discovery, development and ... enrollment in its ongoing randomized HOPE-Duchenne clinical trial ... of its 24-patient target. Capricor expects the trial ... of 2016, and to report top line data ...
(Date:6/23/2016)... BOGOTA, Colombia , June 23, 2016  Astellas today announced the establishment of Astellas Farma Colombia (AFC), a ... second affiliate in Latin America . ... ... ... ...
(Date:6/23/2016)... 23, 2016  Experian Health, the healthcare ... the patient payment and care experience, today ... products and services that will enhance the ... offerings. These award-winning solutions will enable healthcare ... compliant in an ever-changing environment and redefine ...
Breaking Medicine Technology: