Fig 1.
Examples of T2-MRI at the proximal, middle, and distal sites scanned before (PRE) and at 1 day (D1) after a full marathon race. BFlh, biceps femoris long head; BFsh, biceps femoris short head; MRI, magnetic resonance imaging; SM, semimembranosus; ST, semitendinosus.
Fig 2.
Mean difference in T2 value from the baseline value (PRE) of the biceps femoris long head (A), biceps femoris short head (B), semitendinosus (C), and semimembranosus (D) muscles. Error bars indicate 95% confidence intervals. *Significantly different from PRE at p < 0.05. **Significantly different from PRE at p < 0.01. D1, 1 day after marathon; D3, 3 days after marathon; D8, 8 days after marathon. BFlh, biceps femoris long head; BFsh, biceps femoris short head; ST, semitendinosus; SM, semimembranosus.
Fig 3.
Peak T2 changes from PRE (ΔT2) within 8 days after a full marathon.
Values are mean±standard deviation. BFlh, biceps femoris long head; BFsh, biceps femoris short head; ST, semitendinosus; SM, semimembranosus.
Table 1.
Results of statistical analyses for the T2 values.
Table 2.
Time-dependent change in the absolute value of T2 values (Mean ± SD) measured before (PRE) and 1 day (D1), 3 days (D3) and 8 days (D8) after the marathon race.
Effect sizes are shown in parentheses.
Fig 4.
Mean difference in maximal isometric knee flexion torque from the baseline (PRE).
Error bars indicate 95% confidence intervals. D1, 1 day after marathon; D3, 3 days after marathon; D8, 8 days after marathon.