Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Muscle-building hand-grips aid systolic blood pressure, carotid AD, endothelial function

07.10.2004


High-tech isometrics helps persons on hypertension medication

Don’t try this at home, but a high-tech version of the muscle crowd’s hand-grip has demonstrated the ability to lower blood pressure, improve the flexibility of the carotid artery and heighten vasoactive sensitivity in people taking medication for hypertension.

Two studies at the McMaster University Department of Kinesiology Exercise and Metabolism Research Group sought to confirm earlier findings related to risk factors for cardiovascular disease (CVD), as well as to uncover some of the underlying mechanisms. Both studies used similar methodology and isometric handgrip (IHG) exercise three times a week for eight weeks at 30% of maximal voluntary contraction.



IHG’s effect on carotid distensibility

Adrienne Visocchi led a group studying whether arterial distensibility (AD, or the ability of arteries to stretch) contributed to the reduction in resting blood pressure (RBP). They compared the impact of isometric arm and leg exercise on RBP as well as central (carotid) and peripheral (arm and leg arteries) AD in persons who were already taking medication for hypertension, or high blood pressure. Her group consisted of Cheri L.M. McGowan, Martha Faulkner, Robin Verduyn, Neil McCartney and Maureen J. MacDonald.

Results indicated that following IHG exercise systolic blood pressure decreased significantly, while carotid AD improved significantly. IHG didn’t affect either diastolic BP or peripheral AD. The study also tested isometric leg press exercise, but it had no effect on any of the parameters being studied.

IHG’s effect on endothelial function

Hypertension is associated with endothelial dysfunction and development of cardiovascular disease, noted Cheri L.M. McGowan, who led the other McMaster study. Her group studied endothelial function after IGH to see if it played a role in the reduction of blood pressure in people taking anti-hypertensive medication. Other group members included Adrienne Viscocchi, Martha Faulkner, Mark Rakobowchuk, Neil McCartney and Maureen J. MacDonald. Both McMaster studies were undertaken in Dr. MacDonald’s laboratory.

Prior to beginning the exercise regimen, vascular reactivity, which is a measure of an artery’s ability to dilate in response to an increase in blood flow, was measured in both arms using a technique called flow-mediated dilation (FMD). This technique involves stopping blood flow to the forearm for 5 minutes then measuring the artery’s internal diameter with ultrasound after blood flow is reintroduced. After training, systolic blood pressure decreased significantly, while FMD increased (both relative and normalized to average shear rate). Average resting diameter and resting flow remained unchanged.

The researchers also noted that following training there was a reduced reactive hyperemic flow (blood flow after cuff deflation). Although the amount of blood flowing through the artery was less than before training, the artery still dilated more. This suggests a heightened vasoactive sensitivity to the reactive hyperemic stimulus. These findings suggest that the reduction of blood pressure with IHG may be due to improvements of endothelial function.

Mayer Resnick | EurekAlert!
Further information:
http://www.the-aps.org

More articles from Health and Medicine:

nachricht Rabies viruses reveal wiring in transparent brains
19.01.2017 | Rheinische Friedrich-Wilhelms-Universität Bonn

nachricht On track to heal leukaemia
18.01.2017 | Universitätsspital Bern

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

New Study Will Help Find the Best Locations for Thermal Power Stations in Iceland

19.01.2017 | Earth Sciences

Not of Divided Mind

19.01.2017 | Life Sciences

Molecule flash mob

19.01.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>