45 Therefore, even if the anti-doping rules at issue are to be regarded as a decision of an association of undertakings limiting the appellants’ freedom of action, they do not, for all that, necessarily constitute a restriction of competition incompatible with the common market, within the meaning of Article 81 EC, since they are justified by a legitimate objective. Such a limitation is inherent in the organisation and proper conduct of competitive sport and its very purpose is to ensure healthy rivalry between athletes.
46 While the appellants do not dispute the truth of this objective, they nevertheless contend that the anti-doping rules at issue are also intended to protect the IOC’s own economic interests and that it is in order to safeguard this objective that excessive rules, such as those contested in the present case, are adopted. The latter cannot therefore, in their submission, be regarded as inherent in the proper conduct of competitive sport and fall outside the prohibitions in Article 81 EC.
47 It must be acknowledged that the penal nature of the anti-doping rules at issue and the magnitude of the penalties applicable if they are breached are capable of producing adverse effects on competition because they could, if penalties were ultimately to prove unjustified, result in an athlete’s unwarranted exclusion from sporting events, and thus in impairment of the conditions under which the activity at issue is engaged in. It follows that, in order not to be covered by the prohibition laid down in Article 81(1) EC, the restrictions thus imposed by those rules must be limited to what is necessary to ensure the proper conduct of competitive sport (see, to this effect, DLG, paragraph 35).
48 Rules of that kind could indeed prove excessive by virtue of, first, the conditions laid down for establishing the dividing line between circumstances which amount to doping in respect of which penalties may be imposed and those which do not, and second, the severity of those penalties.
49 Here, that dividing line is determined in the anti-doping rules at issue by the threshold of 2 ng/ml of urine above which the presence of Nandrolone in an athlete’s body constitutes doping. The appellants contest that rule, asserting that the threshold adopted is set at an excessively low level which is not founded on any scientifically safe criterion.
50 However, the appellants fail to establish that the Commission made a manifest error of assessment in finding that rule to be justified.
51 It is common ground that Nandrolone is an anabolic substance the presence of which in athletes’ bodies is liable to improve their performance and compromise the fairness of the sporting events in which they participate. The ban on that substance is accordingly in principle justified in light of the objective of anti-doping rules.
52 It is also common ground that that substance may be produced endogenously and that, in order to take account of this phenomenon, sporting bodies, including the IOC by means of the anti-doping rules at issue, have accepted that doping is considered to have occurred only where the substance is present in an amount exceeding a certain threshold. It is therefore only if, having regard to scientific knowledge as it stood when the anti-doping rules at issue were adopted or even when they were applied to punish the appellants, in 1999, the threshold is set at such a low level that it should be regarded as not taking sufficient account of this phenomenon that those rules should be regarded as not justified in light of the objective which they were intended to achieve.
53 It is apparent from the documents before the Court that at the material time the average endogenous production observed in all studies then published was 20 times lower than 2ng/ml of urine and that the maximum endogenous production value observed was nearly a third lower. While the appellants contend that, from 1993, the IOC could not have been unaware of the risk reported by an expert that merely consuming a limited quantity of boar meat could cause entirely innocent athletes to exceed the threshold in question, it is not in any event established that at the material time this risk had been confirmed by the majority of the scientific community. Moreover, the results of the studies and the experiments carried out on this point subsequent to the decision at issue have no bearing in any event on the legality of that decision.
54 In those circumstances, and as the appellants do not specify at what level the threshold in question should have been set at the material time, it does not appear that the restrictions which that threshold imposes on professional sportsmen go beyond what is necessary in order to ensure that sporting events take place and function properly.
55 Since the appellants have, moreover, not pleaded that the penalties which were applicable and were imposed in the present case are excessive, it has not been established that the anti-doping rules at issue are disproportionate.
56 Accordingly, the second plea must be dismissed.