Navigation Links
Older people who diet without exercising lose valuable muscle mass
Date:9/17/2008

BETHESDA, Md. (Sept. 17, 2008) - A group of sedentary and overweight older people placed on a four-month exercise program not only became more fit, but burned off more fat, compared to older sedentary people who were placed on a diet but did not exercise.

The new study also showed that when older people diet without exercising, they lose more lean muscle compared to those who exercise, said senior researcher Bret H. Goodpaster. When they combined weight loss with exercise, it nearly completely prevented the loss of lean muscle mass. The results are important because older people tend to lose muscle mass as they age and too much muscle loss may interfere with activities of daily living.

The study, "Separate and combined effects of exercise training and weight loss on exercise efficiency and substrate oxidation," appears in the current issue of the Journal of Applied Physiology, published by The American Physiological Society. Francesca Amati, John J. Dube, Chris Shay and Goodpaster, all of the University of Pittsburgh, carried out the study.

Study looks at exercise efficiency

The researchers wanted to know the best way to get better (more efficient) at completing a defined exercise task. In particular, they wanted to know if greater fitness could be achieved through exercise training, weight loss (through dieting), or both. In addition, they wanted to know which fuel source the body would draw upon, carbohydrates or fats, under these different conditions.

The 64 participants were 60-75 years of age and were either overweight or obese. All of the participants were sedentary at the outset of the study. The researchers divided the participants into three groups:

  • exercise only
  • diet only
  • exercise plus diet

Those who exercised could either walk on a treadmill or ride a stationary bicycle, although most chose to walk. The dieters reduced their caloric intake to achieve a 10% weight loss by the end of the four-month study period. The final group combined both the daily exercise and the diet.

Exercise increases efficiency, burns more fat

The researchers measured how many calories the participants expended during a set work load on a stationary bicycle at the beginning and at the end of the experiment. They found that the:

  • Exercise group expended fewer calories (became more efficient) on the exercise task at the end of the study compared to the beginning.
  • Exercise group drew more on fat stores as the source of their body's fuel.
  • Diet-only group did not gain efficiency in performing the exercise task, even though they weighed less at the end of the experiment.
  • Diet-only group's weight loss resulted from a loss of both muscle and fat.
  • Exercise plus diet group was the most efficient at the exercise task at the end of the experiment. This shows an additive effect of both dieting and exercise, but most of that benefit was due to exercise.
  • Exercise plus diet group, like the exercise-only group, drew more on fat stores as an energy source.

"The take-home message is that, even among older people and during a fairly short period of time, exercise produces metabolic changes that require the expenditure of fewer calories during physical activity," Goodpaster said. Exercise also allowed older people to more preferentially burn fat, which may be healthier metabolically."


'/>"/>

Contact: Christine Guilfoy
cguilfoy@the-aps.org
301-634-7253
American Physiological Society
Source:Eurekalert

Related biology news :

1. Older climbers face uphill battle on Mount Everest
2. Tamiflu effective for treatment and prevention of influenza in children 1 year and older
3. High blood pressure in older adults traced to genes effects in blood vessels
4. Worlds largest investor coalition seeks further disclosure on climate change and shareholder value
5. Stakeholders use science to find common ground on wood supply from forests
6. RING finger protein 5 may guide treatment for muscle disease in older adults
7. Testosterone replacement theraphy beneficial in men 60 and older
8. BIO-key(R) Issues Open Letter to Shareholders
9. Plants can be used to study how and why people respond differently to drugs
10. Fungus genome yielding answers to protect grains, people and animals
11. People who skip meals: are they better off?
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/11/2017)... N.Y. , April 11, 2017 ... fingerprints, but researchers at the New York University ... College of Engineering have found that partial similarities ... security systems used in mobile phones and other ... thought. The vulnerability lies in the ...
(Date:4/5/2017)... 2017  The Allen Institute for Cell Science today ... one-of-a-kind portal and dynamic digital window into the human ... first application of deep learning to create predictive models ... and a growing suite of powerful tools. The Allen ... future publicly available resources created and shared by the ...
(Date:4/4/2017)... April 4, 2017   EyeLock LLC , a ... the United States Patent and Trademark Office (USPTO) has ... the linking of an iris image with a face ... represents the company,s 45 th issued patent. ... very timely given the multi-modal biometric capabilities that have ...
Breaking Biology News(10 mins):
(Date:9/14/2017)... ... 14, 2017 , ... AIM Global, the worldwide standards agency for AIDC and ... 2017 Case Study Competition for AIDC. The award is given to those in ... push the adoption of automated data collection systems further. The TRACTUS platform, by ...
(Date:9/12/2017)... , ... September 12, 2017 , ... ... and highly scalable cloud-based platform for ambulatory patient monitoring and clinical trial support, ... Advance Clinical Trials conference in Boston. , Launched in 2005, PhysIQ leverages ...
(Date:9/12/2017)... ... September 12, 2017 , ... Soybean researchers ... to submit a "pre-proposal” by October 15, prior to completing a full grant ... are aligned with our priorities, and to encourage researchers to further develop ones ...
(Date:9/12/2017)... ... September 11, 2017 , ... Global molecular ... today that Holotype HLA and other Omixon products will be featured among eight ... American Society for Histocompatibility and Immunogenetics (ASHI) in San Francisco, CA. Additionally, ...
Breaking Biology Technology: