HOME >> BIOLOGY >> NEWS
Your heart is being closely watched while you're asleep

IF YOU thought sleep is when you really relax, think again. Scientists have discovered that the heart comes under especially close control during sleep. Their findings suggest that sleep may play a role that until now has remained hidden.

Scientists now know that the heartbeat is far more complex and irregular than once supposed (New Scientist, 3 January 1998, p 20). The signals that control a healthy heartbeat contain many different frequency components, and this leads to a highly complex pattern of intervals between beats.

The gaps between heartbeats are "anti-correlated": if the heart speeds up over a short sequence of beats, it will slow down again over the next few beats. More importantly, the pattern of these speed-up/slow-down events can be seen on both short and long timescales: it looks the same over a few beats as it does for a thousand beats. In other words, the heartbeat has a fractal pattern.

An international team led by Plamen Ivanov of the physics department at Boston University decided to compare how the fluctuations in the interval between beats varied between day and night. The results surprised them: during the supposedly relaxed state of sleep, the intervals between heartbeats fluctuated much more strongly, but were brought under control more quickly, showing that the heart is under much closer control during sleep. "It was totally counterintuitive," says Ivanov.

The team initially thought the difference might come about because the body is resting during sleep. Physical activity tends to cause changes in the heartbeat, which would lead to more fluctuations and give the appearance that the heart had less control. But a marked difference remained even when these external influences were taken into account.

The researchers then compared their results with heart data from the cos-monauts on Mir. "It was interesting to compare them with the cosmonauts who were doing something different under different conditions," says L
'"/>

Contact: Claire Bowles
claire.bowles@rbi.co.uk
44-0-20-7331-2751
New Scientist
30-Nov-1999


Page: 1 2

Related biology news :

1. Preclinical safety study shows adipose-derived stem cells improve heart function after heart attack
2. Screen siblings, parents of infants with severe heart abnormalities
3. Recent evolution at a single gene may have brought down heart disease risk in some human groups
4. How do you mend a broken heart?
5. Protemix corporation announces discovery of way to repair hearts damaged by diabetes
6. Embryonic stem cell therapy shows steady benefits in rebuilding infarcted heart
7. Putting energy into heart protection
8. Rare mutations can significantly increase risk factor for heart disease
9. Smart gene therapy protects against damage from heart attack
10. University of Pittsburgh medical center among first to implant heart assist device
11. Reading hexametric rhyme supports cardiac synchronization, especially after a heart attack

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Your heart being closely watched while you asleep

(Date:6/30/2015)... June 30, 2015 Genisphere announced ... CEO to help further develop Genisphere,s therapeutics capabilities and ... experience, having spent much of the last 25 years ... Baxter Bioscience, and Johnson & Johnson. Tom started his ... and Biotech Corporate Finance. He graduated from Dartmouth College ...
(Date:6/25/2015)... -- According to a new market ... Technology, Material (Optical Prism, Piezoelectric, Capacitive & Adhesives), ... & Geography - Global Forecast to 2014 - ... expected to reach $14,500.07 Million by 2020, at ... 76 market Tables and 109 Figures spread through ...
(Date:6/24/2015)... YORK , June 24, 2015 The ... rate. The major drivers for the market include growth ... number of new drug launches. Over the years, the ... increased. Between 2001 and 2010, the FDA approved 225 ... according to WIPO, Europe accounted ...
Breaking Biology News(10 mins):Genisphere Appoints New CEO, Thomas Bliss 2Genisphere Appoints New CEO, Thomas Bliss 3Fingerprint Sensors Market Worth $14,500.07 Million by 2020 2Fingerprint Sensors Market Worth $14,500.07 Million by 2020 3Fingerprint Sensors Market Worth $14,500.07 Million by 2020 4Biological Safety Testing Market by Application, Product, & Test - Global Forecast to 2019 2Biological Safety Testing Market by Application, Product, & Test - Global Forecast to 2019 3Biological Safety Testing Market by Application, Product, & Test - Global Forecast to 2019 4
(Date:7/1/2015)... 2015   Decision Resources Group finds ... Otezla are its oral administration, alternative mechanism of ... surveyed rheumatologists. Otezla was the first oral therapy ... active psoriatic arthritis in the United ... includes conventional oral treatments including disease-modifying antirheumatic drugs ...
(Date:7/1/2015)... and BANGALORE, India , July 1, ... company that uses next generation sequencing technology to empower ... A. Storrer as chief executive officer. In his ... be responsible for all strategy, business expansion and worldwide ... has served as Strand,s chairman and CEO since its ...
(Date:7/1/2015)... 1, 2015  Axovant Sciences Ltd. (NYSE:  AXON), ... treatment of dementia, today announced that the company ... at 5:45 p.m. EDT following its presentation of ... Conference 2015 (AAIC). The event ... Dr. Lawrence Friedhoff , Chief Development Officer, ...
(Date:7/1/2015)... ... July 01, 2015 , ... A newly launched business plan contest will ask ... to innovation in life sciences R&D. The Pistoia Alliance President’s Startup Challenge 2015 will ... and a period of expert mentorship from a senior industry figure drawn from the ...
Breaking Biology Technology:Surveyed Rheumatologists Report That Otezla's Oral Administration is its Single Greatest Advantage Over Currently Available Treatment Options 2Surveyed Rheumatologists Report That Otezla's Oral Administration is its Single Greatest Advantage Over Currently Available Treatment Options 3Strand Life Sciences Names Scott A. Storrer CEO as Company Continues Global Expansion with Focus on Precision Medicine Product 2Strand Life Sciences Names Scott A. Storrer CEO as Company Continues Global Expansion with Focus on Precision Medicine Product 3Axovant Sciences To Host Investor Briefing And Live Webcast During AAIC 2015 Meeting 2Axovant Sciences To Host Investor Briefing And Live Webcast During AAIC 2015 Meeting 3Pistoia Alliance Launches Startup Challenge 2Pistoia Alliance Launches Startup Challenge 3
Cached News: