Garatachea-Vallejo, N. Santiago, C. Yvert, T. Verde-Rello, Z. Fiuza-Luces, C. Santos-Lozano, A. Gómez-Gallego, F. Lucía, A. Genetic variants in the PPARD-PPARGC1A-NRF-TFAM mitochondriogenesis pathway are neither associated with muscle characteristics nor physical performance in elderly Rev. int. cienc. deporte 10.5232/ricyde2015.04101 2015 2015