Final answer:
Parental or guardian consent is more likely to pose a liability concern when dealing with a minor athlete.
Step-by-step explanation:
When dealing with a minor athlete, parental or guardian consent is more likely to pose a liability concern compared to informed consent from the athlete. Parents can provide consent on behalf of their children, but children are not competent to provide consent for themselves. An institution's IRB requires parents or legal guardians to sign an informed consent form for participants under the age of 18, ensuring they are informed about the experiment and its potential risks.