What does the scientific evidence suggest about the impact of stretching on delayed onset muscle soreness (DOMS) as discussed in the lecture video?

Question

BlackTom AI · Accepted Answer

Randomized trials and systematic reviews consistently show that stretching—whether performed before or after eccentric exercise—does not prevent or meaningfully reduce delayed onset muscle soreness (DOMS).

Relevant knowledge points: DOMS is a pain response peaking 24–72 hours after unaccustomed eccentric exercise, caused by microtrauma, inflammation, and increased sensitivity of nociceptors. Interventions are judged by validated pain scales (e.g., visual analog scale) measured at those time points. High-quality evidence comes from randomized controlled trials and meta-analyses comparing stretching protocols to no-stretch controls.

Step-by-step reasoning:
1. Define the comparison: subjects who performed stretching (static or dynamic, pre- or post-exercise) versus subjects who did not stretch.
2. Identify outcomes and timing: soreness scores at 24, 48, and 72 hours after exercise.
3. Summarize results across studies: most trials show no statistically significant difference in pain scores between stretching and no-stretch groups at these time points. When pooled in meta-analyses, any mean differences are extremely small and fall below thresholds for clinical relevance.
4. Mechanistic explanation: stretching does not prevent the primary cause of DOMS—structural muscle microtears and subsequent inflammatory responses—so it is biologically plausible that stretching has little to no protective effect.
5. Consider heterogeneity and limitations: study protocols vary (type/duration of stretching, exercise type), but consistent null findings across diverse designs strengthen the conclusion.

Why the correct answer is correct: both randomized trials and systematic reviews converge on “no effect,” meaning stretching does not reduce the incidence or intensity of DOMS in a meaningful way.

Why other options are incorrect: “Significantly reduces DOMS” is unsupported by pooled evidence; “slightly reduces DOMS” overstates effects that are statistically or clinically negligible; “Stretching can actually increase DOMS” lacks consistent evidence and is not the consensus.

Final confirmation: The correct answer is “Stretching has no effect on DOMS,” consistent with the evidence presented in the lecture.

What does the scientific evidence suggest about the impact of stretching on delayed onset muscle soreness (DOMS) as discussed in the lecture video?单项选择题

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