TL;DR
A study from the University of Vienna shows jaw muscles decline less rapidly than leg muscles with age, indicating lifestyle factors influence muscle aging. Strength decline, however, appears similar in both muscle groups. This research highlights the complex relationship between aging, activity, and muscle health.
A new study from the University of Vienna reveals that jaw muscles decline in size at a slower rate than leg muscles with age, suggesting that lifestyle factors significantly influence muscle aging. This finding offers insight into how activity levels may mitigate some effects of aging, making it relevant for understanding muscle health across the lifespan.
The study involved 30 healthy women divided into three age groups: 18-30, 40-50, and 65-75. Researchers measured the size and strength of their quadriceps and masseter muscles using ultrasound, leg-extension machines, and bite force sensors. Results showed that muscle size declined approximately twice as fast in leg muscles (1.02% per year) compared to jaw muscles (0.49% per year). However, when assessing muscle strength, both muscle groups showed similar decline rates, indicating a complex relationship between size and functional capacity.
One notable aspect is the difference between muscle size loss and strength decline. While size decreased more rapidly in legs, strength diminished at comparable rates in both muscles. Experts suggest this may be due to differences in muscle fiber types and neural control, with fast-twitch fibers in legs being more vulnerable to disuse and disuse-related atrophy. Additionally, the neural pathways differ between jaw and leg muscles, potentially influencing how they age.
Why It Matters
This research underscores the impact of lifestyle choices on muscle aging, implying that maintaining activity, especially in the jaw through continued chewing and eating, may slow muscle size decline. It also suggests that muscle strength, which depends on neural factors, may decline similarly regardless of muscle size, highlighting the importance of both physical activity and neural health in aging.
Understanding these differences can influence approaches to aging health, emphasizing the importance of staying active and engaged in activities that preserve muscle function, potentially delaying physical decline and improving quality of life for older adults.
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Background
Previous research has shown that aerobic fitness declines with age, but regular training can mitigate this decline. The current study builds on this by exploring muscle-specific aging patterns, comparing muscles that are used continuously (jaw) versus those used less frequently (legs). The findings align with broader evidence that lifestyle and activity levels significantly influence aging processes, although the precise mechanisms remain under investigation.
“Our findings suggest that muscle decline is not solely an inevitable consequence of aging but is heavily influenced by activity levels, especially for muscles like the jaw that are used consistently throughout life.”
— Gustavo Schaun, lead researcher
“The difference between size and strength decline underscores the complexity of muscle aging, involving neural factors and fiber composition.”
— Expert in muscle physiology
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What Remains Unclear
It remains unclear how these findings translate to men or diverse populations, as the study focused solely on women. The long-term implications of maintaining jaw activity versus leg activity are also still being explored, and whether these patterns hold true across different lifestyles and health conditions is uncertain.
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What’s Next
Further longitudinal studies are planned to track individuals over time, assessing how lifestyle modifications impact muscle decline. Researchers aim to explore neural and fiber-type differences more deeply and expand studies to include diverse populations, including men and those with health issues.
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Key Questions
Does chewing gum help slow muscle decline in aging?
While the study suggests jaw muscles decline less in size, it does not directly address whether chewing gum or similar activities can slow overall muscle aging. More targeted research is needed to establish such effects.
Can muscle strength be maintained without increasing muscle size?
Yes, strength can be preserved through neural adaptations and resistance training, even if muscle size does not increase significantly. Neural factors play a key role in muscle function as we age.
Does this mean I should focus on jaw exercises to stay younger?
Not necessarily. While maintaining activity is beneficial, the study emphasizes overall physical activity and neural health. A balanced exercise routine remains the best approach for aging well.
Are there differences in how men and women experience muscle aging?
Research indicates there are gender differences in muscle mass and decline, but specific patterns related to jaw versus leg muscles require further investigation. This study focused on women, so findings may not fully apply to men.
