Skurvydas 2006.

Methods	Randomised cross‐over (9 to 10 months between interventions)
Participants	N = 20 healthy untrained men, aged 20.4 (SD 1.7)
Interventions	CWI (n = 20): Immersion of legs in water at 15°C (SD 1°C) for 15 minutes x 2. 10 minutes between each immersion Passive (n = 20): Seated rest
Outcomes	Pain Muscle soreness (0 to 10 points) (follow‐up: 24, 48, 72 hours post exercise) Strength Isometric knee extension (90 degree knee angle, force measuring device, % of baseline) (follow‐up: immediate (4 hours), 24, 48, 72 hours post exercise) Power Counter movement jump (Kistler force plate, height of jump in cm) (follow‐up: immediate (4 hours), 24, 48, 72 hours post exercise) Biomarker Muscle damage (CK, IU/L) (Follow‐up: 24 hours and 48 hours post exercise)
Exercise type / intensity	100 counter movement jumps from a 0.75 m height
Time between completing exercise and initiating intervention	Immediately and at 4, 8, and 24 hours
Participants' fitness level	Physically active but did not take part in any formal exercise or sports programme
Notes	Data on pain, strength, power and CK were obtained after personal correspondence
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	"The choice of their participation in the first and second experiments was made at random" (pg. 142)
Allocation concealment (selection bias)	High risk	No details in manuscript "No" (personal correspondence)
Blinding (performance bias and detection bias) Participants	High risk	No blinding.
Blinding (performance bias and detection bias) Personnel	High risk	No blinding.
Blinding (performance bias and detection bias) Outcome assessors	High risk	No details in manuscript "No" (personal correspondence)
Incomplete outcome data (attrition bias) All outcomes	Low risk	No details in manuscript All 20 participants completed each treatment arm and data were available for all 20 participants (personal correspondence)
Selective reporting (reporting bias)	Low risk	No published protocol available Outcomes and follow‐ups stated in methods Means and SD presented by intervention group for all outcomes, at all follow‐ups
Other bias	Unclear risk	Exercise protocol well described No details on co‐interventions