Peschek 2014.

Methods	Randomised controlled trial (cross‐over design) Separated by a 21‐day washout
Participants	Setting: laboratory, USA n = 8 well‐trained male runners and triathletes age range 18 to 44 years Inclusion/exclusion criteria Inclusion criteria ‐ currently training for at least 6 or more hours per week Exclusion criteria ‐ lower body extremity injury in the past 6 months and/or were currently taking chronic or daily doses of anti‐inflammatory medication or nutritional supplements. Participants who had a history of a recent illness were also excluded from the study.
Interventions	Intervention 240 mL serving of carbohydrate protein beverage plus natural cocoa (350 mg flavanols) Placebo Placebo cocoa‐based (processed with alkali) carbohydrate protein beverage (0 mg of flavanols) Duration Beverage consumed 1 and 2 hours into recovery after downhill running and primary and secondary outcomes measured for up to 2 days after exercise
Outcomes	PRIMARY Delayed onset muscle soreness at the legs (10‐point visual analogue scale: 0 is "no pain at all" and 10 is "unbearable pain") SECONDARY Muscle tenderness using a force algometer (Wagner Pain Test Model FPK Algometer) Muscle function ‐ Quadricep Extension Performance ‐ 5 km running time trial
Exercise type	Downhill running protocol at a ‐10% grade for 30 minutes at a speed equal to 70% of VO2 max
Sources of funding	Chocolate milk was provided by Darigold Co.
Notes	Drinks were 240 mL per serving and consumed 1 hour post‐exercise and 2 hours post‐exercise. Authors were contacted on 18 February 2016 to request data for delayed onset muscle soreness, maximal voluntary isometric contraction and 5 km time trial but did not respond
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Randomised using a computer program
Allocation concealment (selection bias)	Low risk	Unmarked bottles
Blinding of participants and personnel (performance bias) All outcomes	High risk	Single‐blind design thus personnel were not blinded
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Participants were blinded
Incomplete outcome data (attrition bias) All outcomes	Low risk	All participants completed the study without any adverse effects
Selective reporting (reporting bias)	High risk	All outcomes reported at all time points Adverse effects of antioxidant supplementation were not reported
Other bias	Low risk	Participants were instructed to consume a similar diet during the period of testing and replicate diet during both trials. Participants were instructed to refrain from taking anti‐inflammatory medication.