The secret to staying young: New research highlights power of life long exercise to keep muscles healthy

Date:
March 21, 2022
Source:
The Physiological Society
Summary:
Lifelong physical activity could protect against age-related loss
of muscle mass and function, according to new research. Individuals
aged 68 and above who were physically active throughout their life
have healthier aging muscle that has superior function and is more
resistant to fatigue compared to inactive individuals, both young
and old. This is the first study to investigate muscle, stem cell
and nerve activity in humans. The researchers from University
of Copenhagen, Denmark, found that elderly individuals who keep
physically active throughout their adult life, whether by taking
part in resistance exercise, ball games, racket sports, swimming,
cycling, running and/or rowing had a greater number of muscle stem
cells, otherwise known as satellite cells in their muscle. These
cells are important for muscle regeneration and long-term growth
and protect against nerve decay.



FULL STORY ========================================================================== Lifelong physical activity could protect against age-related loss
of muscle mass and function, according to research published in The
Journal of Physiology.Individuals aged 68 and above who were physically
active throughout their life have healthier ageing muscle that has
superior function and is more resistant to fatigue compared to inactive individuals, both young and old.


==========================================================================
This is the first study to investigate muscle, stem cell and nerve
activity in humans. The researchers from University of Copenhagen,
Denmark, found that elderly individuals who keep physically active
throughout their adult life, whether by taking part in resistance
exercise, ball games, racket sports, swimming, cycling, running and/or
rowing had a greater number of muscle stem cells, otherwise known as
satellite cells in their muscle. These cells are important for muscle regeneration and long-term growth and protect against nerve decay.

46 male participants took part in the study. They were divided into three groups: young sedentary (15), elderly lifelong exercise (16) and elderly sedentary (15). They performed a heavy resistance exercise, sitting in a mechanical chair performing a knee extension movement to evaluate muscle function. The amount of force produced was measured. Blood samples were
taken, and muscle biopsies were analysed from both legs. The researchers
found elderly lifelong exercisers outperformed both the elderly and
young sedentary adults.

Lead author, Casper Soendenbroe, University of Copenhagen, Denmark said:
"This is the first study in humans to find that lifelong exercise at a recreational level could delay some detrimental effects of ageing. Using
muscle tissue biopsies, we've found positive effects of exercise on the
general ageing population. This has been missing from the literature
as previous studies have mostly focused on master athletes, which is a
minority group. Our study is more representative of the general population
aged 60 and above, as the average person is more likely to take part
in a mixture of activities at a moderate level. That's why we wanted to
explore the relation between satellite cell content and muscle health in recreationally active individuals. We can now use this as a biomarker to further investigate the link between exercise, ageing and muscle health."
"The single most important message from this study, is that even a little exercise seems to go a long way, when it comes to protecting against the
age- related decline in muscle function. This is an encouraging finding
which can hopefully spur more people to engage in an activity that they
enjoy. We still have much to learn about the mechanisms and interactions between nerves and muscles and how these change as we age. Our research
takes us one step closer." It is worth noting that the study was only
carried out in males and the average age was 73. As the effects of ageing
on muscle health become more pronounced at 80+ years, follow up studies
are needed to see if the benefits of lifelong exercise are maintained
later in life. Further, investigation on recreational activity and muscle health need to be carried out in females.


========================================================================== Story Source: Materials provided by The_Physiological_Society. Note:
Content may be edited for style and length.


========================================================================== Journal Reference:
1. Casper Soendenbroe, Christopher L. Dahl, Christopher Meulengracht,
Michal
Tama's, Rene B. Svensson, Peter Schjerling, Michael Kjaer, Jesper L.

Andersen, Abigail L. Mackey. Preserved stem cell content and
innervation profile of elderly human skeletal muscle with lifelong
recreational exercise. The Journal of Physiology, 2022; DOI:
10.1113/JP282677 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2022/03/220321103818.htm

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