Does Delayed-Onset Muscle Soreness Indicate Muscle Damage? Non-Invasive Methods for Measuring Muscle Damage : Developments and Applications
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.45 Vol.45】
ABSTRACT
Muscle soreness is subjective muscle pain that occurs after high-intensity exercise, and the disappearance of muscle soreness is often used as an indicator of recovery from muscle damage. However, due to methodological limitations, it has not been clear whether muscle soreness reflects structural damage of muscles. The purpose of the present study was to clarify changes in muscle damage/inflammation and muscle soreness after endurance running using the magnetic resonance imaging（diffusion tensor imaging），and to examine whether muscle soreness is an indicator of recovery from muscle damage. We measured subjective delayed onset muscle soreness （DOMS）， T2 relaxation time and diffusion parameters for each of 12 muscles of the lower limb using MR before and after a 20 km race including up-hill and down-hill in 16 male and female recreational runners. The results showed that the peaks of the DOMS and T2 relaxation time were on 1-2 days after the race, and recovered 3-4 days after the race. On the other hand, the mean diffusivity （MD） of some of the thigh muscles increased until 3-4 days after the race. In conclusion, even after the recovery of muscle soreness after the 20 km race, it is likely that muscle structural changes due to muscle damage or inflammatory reactions are still occurring, and it is not appropriate to use muscle soreness as an index for resume of exercise.
DECENTE SPORTS SCIENCE Vol.45/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
Muscle soreness is subjective muscle pain that occurs after high-intensity exercise, and the disappearance of muscle soreness is often used as an indicator of recovery from muscle damage. However, due to methodological limitations, it has not been clear whether muscle soreness reflects structural damage of muscles. The purpose of the present study was to clarify changes in muscle damage/inflammation and muscle soreness after endurance running using the magnetic resonance imaging（diffusion tensor imaging），and to examine whether muscle soreness is an indicator of recovery from muscle damage. We measured subjective delayed onset muscle soreness （DOMS）， T2 relaxation time and diffusion parameters for each of 12 muscles of the lower limb using MR before and after a 20 km race including up-hill and down-hill in 16 male and female recreational runners. The results showed that the peaks of the DOMS and T2 relaxation time were on 1-2 days after the race, and recovered 3-4 days after the race. On the other hand, the mean diffusivity （MD） of some of the thigh muscles increased until 3-4 days after the race. In conclusion, even after the recovery of muscle soreness after the 20 km race, it is likely that muscle structural changes due to muscle damage or inflammatory reactions are still occurring, and it is not appropriate to use muscle soreness as an index for resume of exercise.
DECENTE SPORTS SCIENCE Vol.45/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Yoko Kunimasai*1, Robin Macchi*2, David Bendahan*2, Caroline Nicol*2, Francesca Rossi*3 |
|---|---|
| University or institution | *1 Niigata University, *2 Aix-Marseille University, *3 Bologna University |
Keywords