View Full Version : Re: Exercise: Your mileage may vary

December 2nd 04, 08:53 PM
Kofi > wrote:
> http://news.bbc.co.uk/1/hi/health/4059695.stm
> UK experts say people should still exercise
> There may be an explanation for why those gym workouts seem not to have
> any effect - US experts suggest some people benefit less from exercise.

There was also this: http://tinyurl.com/68nxh They studied MZ and DZ
twins discordant for the past (mostly aerobic) physical activity with
respect the markers of aging and health. They conluded that physical
activity cannot offset genetic factors when it comes to major factors
of aging and health. (Bearing in mind small number of twin pairs)

"The difference in activity levels was strong, one of the twins having
in the past practiced a sport activity regularly and for several years
at a moderate level, while the co-twin had not practiced at all."

"Our data would therefore seem to suggest that physical activity,
beneficial as it can be, may not greatly affect monozygotic co-twin
resemblance throughout life"


> Louisiana University researchers put 742 people through a strenuous
> 20-week endurance training programme.
> Measures such as oxygen consumption improved in some, but not in others,
> New Scientist magazine revealed.
> UK sports experts said people did differ - and that was why they should
> have tailored exercise programmes.
> Everyone should do something to try to stay fit
> Sam Howells, Lilleshall Sports Injury and Human Performance Centre
> The researchers selected the volunteers from 213 families,
> None of the participants had undertaken regular physical activity for
> the previous six months.
> All were asked to use exercise bikes. By the last six weeks of the
> study, they were exercising for 50 minutes, three times a week, at 75%
> of the maximum output they were capable of before the study.
> Differences
> Previous research had suggested that people do vary in heir
> "trainability" - how much improvement is likely to be seen after an
> exercise regime.
> In this study, the researchers found training improved maximum oxygen
> consumption, a measure of a person's ability to perform well, by an
> average of 17%.
> But the most "trainable" participants improved by 40% - and the least
> showed no improvement at all.
> Similar patterns were seen when other fitness measures such as cardiac
> output, blood pressure, heart rate were checked.
> When the researchers looked at insulin resistance, a marker of risk for
> heart disease and diabetes, they found it had improved in 58% of
> participants following the exercise regime but stayed the same, or even
> fell, in 42%.
> The team also compared the eight who showed the highest improvement in
> insulin sensitivity and the eight who had least.
> The study was presented to the Australian Health and Medical Research
> Congress in Sydney.
> Claude Bouchard, who led the research, said: "There is an astounding
> variation in the response to exercise.
> "The vast majority will benefit in some way, but there will be a
> minority who will not benefit at all."
> Kathryn North of the Institute of Neuromuscular Research at the
> Children's Hospital at Westmead, Sydney, said: "It's negative, but it's
> true. Some people slog away and don't get any improvement."
> Mark Hargreaves, of Deakin University, Melbourne, added: "We need to
> recognise that, although on average exercise may have clear benefits, it
> may not work for everyone.
> "Some people may do better to change their diet."
> But Sam Howells, senior sports physiologist at Lilleshall Sports Injury
> and Human Performance Centre, said: "It would be worrying if these
> findings deterred people from exercising.
> "What this study shows is that everyone is unique.
> "That's why fitness programmes should be tailored to an individual's
> needs.
> "But everyone should do something to try to stay fit."