Frail Frontiers?*

Physical Activity in Non-Frail and Frail Older Adults

INTRODUCTION Physical activity (PA) is important for healthy ageing. Better insight into objectively measured PA levels in older adults is needed, since most previous studies employed self-report measures for PA assessment, which are associated with overestimation of PA. AIM This study aimed to provide insight in objectively measured indoor and outdoor PA of older adults, and in PA difference...

Impossible Frontiers

A key result of the Capital Asset Pricing Model (CAPM) is that the market portfolio— the portfolio of all assets in which each asset’s weight is proportional to its total market capitalization—lies on the mean-variance-efficient frontier, the set of portfolios having mean-variance characteristics that cannot be improved upon. Therefore, the CAPM cannot be consistent with efficient frontiers for...

Pharmacotherapy in frail elderly

Frontiers Conferences

Neural prostheses, or brain-computer interfaces (BCIs), have the potential to substantially increase quality of life for people suffering from motor disorders, including paralysis and amputation. These systems translate recorded neural signals into control signals that guide a paralyzed arm, artificial limb, or computer cursor. Although current laboratory demonstrations provide a compelling pro...

Discrete Frontiers

Many applications require to extract the surface of an object from a discrete set of valued points, applications in which the topological soundness of the obtained surface is, in many case, of the utmost importance. In this paper, we introduce the notion of frontier order which provides a discrete framework for defining frontiers of arbitrary objects. A major result we obtained is a theorem whi...