title: 24-Week study on the use of collagen hydrolysate as a dietary supplement in athletes with activity-related joint pain.
abstract: BACKGROUND
  Collagen hydrolysate is a nutritional supplement that has been shown to exert an anabolic effect on cartilage tissue. Its administration appears beneficial in patients with osteoarthritis.
  
  
  OBJECTIVE
  To investigate the effect of collagen hydrolysate on activity-related joint pain in athletes who are physically active and have no evidence of joint disease.
  
  
  METHODS
  A prospective, randomized, placebo-controlled, double-blind study was conducted at Penn State University in University Park, Pennsylvania. Parameters including joint pain, mobility, and inflammation were evaluated with the use of a visual analogue scale during a 24-week study phase.
  
  
  METHODS
  Between September 2005 and June 2006, 147 subjects who competed on a varsity team or a club sport were recruited. Data from 97 of 147 subjects could be statistically evaluated.
  
  
  METHODS
  One hundred and forty-seven subjects (72 male, 75 female) were randomly assigned to two groups: a group (n = 73) receiving 25 mL of a liquid formulation that contained 10 g of collagen hydrolysate (CH-Alpha) and a group (n = 74) receiving a placebo, which consisted of 25 mL of liquid that contained xanthan.
  
  
  METHODS
  The primary efficacy parameter was the change in the visual analogue scales from baseline during the study phase in relation to the parameters referring to pain, mobility, and inflammation.
  
  
  RESULTS
  When data from all subjects (n = 97) were evaluated, six parameters showed statistically significant changes with the dietary supplement collagen hydrolysate (CH) compared with placebo: joint pain at rest, assessed by the physician (CH vs. placebo (-1.37 +/- 1.78 vs. -0.90 +/- 1.74 (p = 0.025)) and five parameters assessed by study participants: joint pain when walking (-1.11 +/- 1.98 vs. -0.46 +/- 1.63, p = 0.007), joint pain when standing (-0.97 +/- 1.92 vs. -0.43 +/- 1.74, p = 0.011), joint pain at rest (-0.81 +/- 1.77 vs. -0.39 +/- 1.56, p = 0.039), joint pain when carrying objects (-1.45 +/- 2.11 vs. -0.83 +/- 1.71, p = 0.014) and joint pain when lifting (-1.79 +/- 2.11 vs. -1.26 +/- 2.09, p = 0.018). When a subgroup analysis of subjects with knee arthralgia (n = 63) was performed, the difference between the effect of collagen hydrolysate vs. placebo was more pronounced. The parameter joint pain at rest, assessed by the physician, had a statistical significance level of p = 0.001 (-1.67 +/- 1.89 vs. -0.86 +/- 1.77), while the other five parameters based on the participants' assessments were also statistically significant: joint pain when walking (p = 0.003 (-1.38 +/- 2.12 vs. -0.54 +/- 1.65)), joint pain when standing (p = 0.015 (-1.17 +/- 2.06 vs. -0.50 +/- 1.68)), joint pain at rest with (p = 0.021 (-1.01 +/-1.92 vs. -0.47 +/- 1.63)), joint pain when running a straight line (p = 0.027 (-1.50 +/- 1.97 vs. -0.80 +/- 1.66)) and joint pain when changing direction (p = 0.026 (-1.87 +/- 2.18 vs. -1.20 +/- 2.10)).
  
  
  CONCLUSIONS
  This was the first clinical trial of 24-weeks duration to show improvement of joint pain in athletes who were treated with the dietary supplement collagen hydrolysate. The results of this study have implications for the use of collagen hydrolysate to support joint health and possibly reduce the risk of joint deterioration in a high-risk group. Despite the study's size and limitations, the results suggest that athletes consuming collagen hydrolysate can reduce parameters (such as pain) that have a negative impact on athletic performance. Future studies are needed to support these findings.
authors.affiliation: Department of Nutrition and Sports Nutrition for Athletics, Penn State University, University Park, PA 16802, USA. klc5@psu.edu
authors.forename: Kristine L
authors.initials: KL
authors.lastname: Clark
authors.forename: Wayne
authors.initials: W
authors.lastname: Sebastianelli
authors.forename: Klaus R
authors.initials: KR
authors.lastname: Flechsenhar
authors.forename: Douglas F
authors.initials: DF
authors.lastname: Aukermann
authors.forename: Felix
authors.initials: F
authors.lastname: Meza
authors.forename: Roberta L
authors.initials: RL
authors.lastname: Millard
authors.forename: John R
authors.initials: JR
authors.lastname: Deitch
authors.forename: Paul S
authors.initials: PS
authors.lastname: Sherbondy
authors.forename: Ann
authors.initials: A
authors.lastname: Albert
mesh_terms: D000293:Adolescent; D000328:Adult; D018771:Arthralgia / Q000188:drug therapy* / Q000517:prevention & control; D001265:Athletic Injuries / Q000517:prevention & control; D003094:Collagen; D019587:Dietary Supplements; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010147:Pain Measurement / Q000187:drug effects; D011336:Probability; D011446:Prospective Studies; D011492:Protein Hydrolysates / Q000008:administration & dosage*; D016059:Range of Motion, Articular / Q000187:drug effects* / Q000502:physiology; D012016:Reference Values; D013177:Sports / Q000502:physiology*; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D011492:Protein Hydrolysates; D003094:Collagen