This study is done by the same researcher as the first. I applaud Walker for studying this, but both his studies have a sample size of one cyclist - himself, r

This study is done by the same researcher as the first. I applaud Walker for studying this, but both his studies have a sample size of one cyclist - himself, riding in one area of one country. [He did put a wig on sometimes, so maybe you could say the sample size is 2? ]