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Warm-up reduces delayed onset muscle soreness but cool-down does not: a randomised controlled trial
Law RY, Herbert RD
Australian Journal of Physiotherapy 2007;53(2):91-95
clinical trial
6/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: No; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: Yes; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

QUESTION: Does warm-up or cool-down (also called warm-down) reduce delayed-onset muscle soreness? DESIGN: Randomised controlled trial of factorial design with concealed allocation and intention-to-treat analysis. PARTICIPANTS: Fifty-two healthy adults (23 men and 29 women aged 17 to 40 years). INTERVENTION: Four equally-sized groups received either warm-up and cool-down, warm-up only, cool-down only, or neither warm-up nor cool-down. All participants performed exercise to induce delayed-onset muscle soreness, which involved walking backwards downhill on an inclined treadmill for 30 minutes. The warm-up and cool-down exercise involved walking forwards uphill on an inclined treadmill for 10 minutes. OUTCOME MEASURE: Muscle soreness, measured on a 100-mm visual analogue scale. RESULTS: Warm-up reduced perceived muscle soreness 48 hours after exercise on the visual analogue scale (mean effect of 13 mm, 95% CI 2 to 24 mm). However cool-down had no apparent effect (mean effect of 0 mm, 95% CI -11 to 11 mm). CONCLUSION: Warm-up performed immediately prior to unaccustomed eccentric exercise produces small reductions in delayed-onset muscle soreness but cool-down performed after exercise does not.

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