Chronotropic Response and Heart Rate Variability before and after a 160 m Walking Test in Young, Middle-Aged, Frail, and Non-Frail Older Adults.By Lesli Álvarez-Millán, Claudia Lerma, Daniel Castillo-Castillo, Rosa M. Quispe-Siccha, Argelia Pérez-Pacheco, Jesús Arellano-Martínez and Ruben Fossion
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