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Regional differences in hamstring muscle damage after a marathon.

Ayako Higashihara1, Kento Nakagawa2, Takayuki Inami1

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Marathon running causes hamstring muscle damage primarily at the distal and middle sites, not the proximal ones. Targeted conditioning for these areas may aid recovery after long-distance running.

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Area of Science:

  • Sports Medicine
  • Musculoskeletal Imaging
  • Exercise Physiology

Background:

  • Marathon running is known to cause muscle damage in the lower extremities.
  • Understanding specific muscle group susceptibility is crucial for athlete recovery.

Purpose of the Study:

  • To investigate inter- and intramuscular differences in hamstring muscle damage after marathon running.
  • To utilize transverse relaxation time (T2)-weighted magnetic resonance imaging (MRI) for damage assessment.

Main Methods:

  • 20 collegiate marathon runners underwent T2-MRI scans before and at 1, 3, and 8 days post-marathon.
  • T2 values were calculated for distal, middle, and proximal sites of hamstring muscles.
  • Statistical analysis compared T2 changes across different muscle sites and time points.

Main Results:

  • No significant intermuscular differences in T2 changes were found.
  • Distal and middle hamstring sites showed significant T2 increases at 1 and 3 days post-marathon, recovering by 8 days.
  • Proximal hamstring sites exhibited no significant changes in T2 values.

Conclusions:

  • The distal and middle regions of hamstring muscles are more vulnerable to marathon-induced damage.
  • Recovery strategies and conditioning should prioritize the distal and middle hamstring sites for runners.