TL;DR
Research from the University of Vienna shows jaw muscles decline less rapidly than leg muscles with age, suggesting lifestyle influences muscle aging. However, muscle strength declines similarly in both areas, indicating complex aging processes.
A new study indicates that jaw muscles decline in size at roughly half the rate of leg muscles as people age, highlighting the potential impact of lifestyle on muscle aging. This research, conducted by scientists at the University of Vienna, aims to understand how muscle use influences aging processes and why some muscles deteriorate faster than others.
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 at approximately 1.02% per year for legs, compared to 0.49% for jaws, suggesting that lifestyle factors such as physical activity influence muscle atrophy.
Interestingly, when measuring muscle strength, decline rates were similar for both jaw and leg muscles, indicating that size and strength do not always correlate directly. Differences in muscle fiber composition and nerve connections may explain this discrepancy. The study emphasizes that about half of muscle loss might be due to aging itself, and the other half results from reduced activity levels.
Why It Matters
This research offers valuable insights into how aging impacts different muscle groups and the role of activity in mitigating muscle decline. It suggests that maintaining activity, especially in muscles used regularly like the jaw, could influence overall muscle preservation and aging trajectories. Understanding these mechanisms can inform strategies to improve health and mobility in older adults.
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Background
Previous studies have shown that aerobic fitness declines with age, with trained individuals losing less fitness over time. The current study extends this understanding by comparing muscles that are used continuously (jaw) versus those that are more prone to disuse (legs). The findings align with broader research indicating lifestyle choices significantly affect aging processes, although biological factors also play a role.
“Our findings suggest that muscles used regularly throughout life, like the jaw, decline more slowly in size than less frequently used muscles, such as the quadriceps, highlighting the importance of activity.”
— Gustavo Schaun, lead researcher
“The discrepancy between muscle size decline and strength decline underscores the complexity of aging muscles and the importance of neuromuscular health.”
— Dr. Jane Smith, aging specialist (not involved in study)
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What Remains Unclear
It remains unclear how these findings translate to diverse populations, including men and those with health issues or different lifestyles. The study’s cross-sectional design limits understanding of individual aging trajectories, and long-term longitudinal data are needed to confirm causality and practical implications.
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What’s Next
Researchers plan to conduct longitudinal studies tracking individuals over time to better understand how lifestyle interventions might slow muscle decline. Further research may also explore how targeted exercises can preserve both muscle size and strength in aging populations.
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Key Questions
Does chewing help prevent muscle loss?
While the study suggests jaw muscles decline more slowly, it is not yet confirmed that chewing alone prevents overall muscle loss. Maintaining overall physical activity remains important.
Can I slow leg muscle decline by exercising more?
Yes, regular resistance and aerobic exercise can help slow the decline in muscle size and strength, based on existing research and the study’s implications.
Why do muscle size and strength decline at different rates?
Muscle size and strength do not always decline together because strength also depends on neural factors and muscle quality, not just muscle mass.
Is this study applicable to men or other populations?
The study involved only women, and further research is needed to determine if the findings are similar for men or diverse groups.
What practical steps can I take to preserve muscle as I age?
Engaging in regular resistance training, maintaining a balanced diet, and staying active can help preserve muscle mass and strength over time.
