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Exercise training differentially alters axial and appendicular marrow cellularity in old mice
Jeff Baker1,1, Joshua P Nederveen1,1, George Ibrahim1,1
1Department of Kinesiology, McMaster University, Hamilton, ON L8S 4L8, Canada.
Summary
Endurance exercise training in aged mice improved bone marrow cellularity and hematopoietic stem cell function. This suggests mechanical forces from exercise can combat age-related bone marrow decline.
Area of Science:
- Gerontology
- Hematology
- Exercise Physiology
Background:
- Aging leads to decreased bone marrow hematopoietic activity.
- Endurance exercise is known to rejuvenate bone marrow in younger animals.
Purpose of the Study:
- To investigate the effects of endurance exercise on aged mice bone marrow.
- To determine if exercise can reverse age-related hematopoietic decline in older mice.
Main Methods:
- Aged mice (22 months old) underwent a progressive treadmill exercise protocol.
- Bone marrow cellularity and stem cell populations (CFU, CFU-GM, CAFC) were analyzed in appendicular and vertebral bones.
Main Results:
- Appendicular bone marrow cellularity increased by 51% in exercised mice.
- Key hematopoietic stem cell populations, including CFU-GM and CAFC, showed significant increases (71% and 86%, respectively).
- Vertebral bone marrow cellularity did not change significantly.
Conclusions:
- Endurance exercise effectively reverses age-related hematopoietic inactivity in the bone marrow of aged mice.
- Mechanical forces from exercise training are likely responsible for the observed improvements in bone marrow function.
- These findings suggest exercise as a potential intervention to mitigate age-related bone marrow decline.
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