Micronutrients & recovery
In older adults (65-83 years), higher habitual physical activity is significantly associated with lower intramuscular noncontractile (fat) content, whereas this relationship is absent in young adults (26-44 years).
If you are over 65, staying physically active is crucial for keeping fat out of your muscles, which helps maintain strength and function. This link between activity and muscle quality is not as obvious in younger people, but becomes a dominant factor as you age. Focus on consistent daily movement rather than just intense workouts to manage intramuscular fat.
There was a significant linear relationship between physical activity and percent noncontractile area in older (r = -0.68, P = 0.002) but not young subjects.
Why this rating
Cross-sectional observational study with objective MRI measurements and accelerometer data, but lacks causal inference due to design.
Source
Skeletal muscle contractile and noncontractile components in young and older women and men
Jane A. Kent‐Braun et al. · Journal of Applied Physiology · 2000
DOI 10.1152/jappl.2000.88.2.662
More from this paper
- Aging is associated with a significant increase in intramuscular noncontractile (fat) content and a decrease in contractile cross-sectional area, resulting in a >2-fold increase in fat relative to muscle mass in older adults compared to young adults.Strong
- Long-term Estrogen Replacement Therapy (ERT) in postmenopausal women is associated with larger contractile cross-sectional area compared to non-ERT women, though it does not significantly affect intramuscular fat content.Moderate
Related findings · Micronutrients & recovery
- Trans fats (industrial trans-fatty acids) are unequivocally harmful and should be completely avoided as they raise LDL-C, TGs, and Apo B while lowering HDL-C.Strong
- For menopausal women with osteoporosis, first-line pharmacologic therapies include alendronate, risedronate, zoledronic acid, and denosumab for the prevention of hip, nonvertebral, and vertebral fractures.Strong
- Folic acid fortification of flour prevents neural tube birth defects, and mandatory fortification is more effective than voluntary supplementation alone.Strong
This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →