Physical activity in prefrail older adults: confidence and satisfaction related to physical function.
Rejeski WJ, King AC, Katula JA, Kritchevsky S, Miller ME, Walkup MP, Glynn NW, Pahor M. Physical activity in prefrail older adults: confidence and satisfaction related to physical function. J Gerontol B Psychol Sci Soc Sci. 2008 Jan; 63(1):P19-26.