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Objective <p>To explore the application value of quantitative magnetic resonance multi-parameter imaging technology, Diffusion Tensor Imaging (DTI) combined with T2 mapping, in evaluating the effects of rest and different intensities of running on the recovery of thigh muscle microdamage after a Half Marathon (HM).</p> Methods <p>Twenty-four amateur marathon runners were enrolled and randomly divided into three groups to compare different post-marathon recovery strategies: the High-Intensity Running (HIR) group, the Moderate-Intensity Running (MIR) group, and the Rest (REST) group. MR scans were performed on the participants before the race (pre-run) and at 3&#xa0;h (post-3&#xa0;h), 24&#xa0;h (post-24&#xa0;h), 48&#xa0;h (post-48&#xa0;h), and 72&#xa0;h (post-72&#xa0;h) after the race. The Fractional Anisotropy (FA), Apparent Diffusion Coefficient (ADC), and T2 relaxation time (T2 value) of the thigh muscle groups were measured.</p> Results <p>Compared with pre-run, all groups showed significantly decreased FA (<i>p</i> &lt; 0.001) and increased T2 (<i>p</i> &lt; 0.001) at post-3&#xa0;h, indicating HM-induced microdamage (characterized by myofiber disruption and interstitial edema). REST group FA recovered to baseline at post-72&#xa0;h, while MIR group recovered partially and HIR group showed no recovery. T2 trends aligned with FA. No significant ADC differences were observed.</p> Conclusion <p>Our findings suggest that quantitative MR multi-parameter imaging can sensitively detect muscle microdamage and the recovery process after HM. The REST group shows the fastest recovery, while moderate- and high-intensity running delay recovery. Therefore, it is not recommended to use moderate- or high-intensity running as an intervention within 3 days after the race.</p>

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Quantitative MRI evaluation of the effects of rest and different intensities of running on the recovery of thigh muscle microdamage after a half marathon

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月7日

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  • Jing Zhou,
  • Chengyuan Xu,
  • Yawen Wu,
  • Xinmiao Mao,
  • Zhenqi Hu,
  • Zhouhao Wei,
  • Yuqing Li,
  • Jie Huang

摘要

Objective

To explore the application value of quantitative magnetic resonance multi-parameter imaging technology, Diffusion Tensor Imaging (DTI) combined with T2 mapping, in evaluating the effects of rest and different intensities of running on the recovery of thigh muscle microdamage after a Half Marathon (HM).

Methods

Twenty-four amateur marathon runners were enrolled and randomly divided into three groups to compare different post-marathon recovery strategies: the High-Intensity Running (HIR) group, the Moderate-Intensity Running (MIR) group, and the Rest (REST) group. MR scans were performed on the participants before the race (pre-run) and at 3 h (post-3 h), 24 h (post-24 h), 48 h (post-48 h), and 72 h (post-72 h) after the race. The Fractional Anisotropy (FA), Apparent Diffusion Coefficient (ADC), and T2 relaxation time (T2 value) of the thigh muscle groups were measured.

Results

Compared with pre-run, all groups showed significantly decreased FA (p < 0.001) and increased T2 (p < 0.001) at post-3 h, indicating HM-induced microdamage (characterized by myofiber disruption and interstitial edema). REST group FA recovered to baseline at post-72 h, while MIR group recovered partially and HIR group showed no recovery. T2 trends aligned with FA. No significant ADC differences were observed.

Conclusion

Our findings suggest that quantitative MR multi-parameter imaging can sensitively detect muscle microdamage and the recovery process after HM. The REST group shows the fastest recovery, while moderate- and high-intensity running delay recovery. Therefore, it is not recommended to use moderate- or high-intensity running as an intervention within 3 days after the race.