http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0154075 http://journals.plos.org/plosone/article?id=10.1371/journal.... In the paper the artic

http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0154075 http://journals.plos.org/plosone/article?id=10.1371/journal.... In the paper the article references, it seems that the sample size is small . n<=9 in all the three groups (Sprint interval training, Moderate intensity , Control) in the test. This should make it really hard to generalize this result across the population , no?