Sarcopenia =/= dynapenia.

By Brian C. Clark, Todd M. Manini. The journals of gerontology. Series A, Biological sciences and medical sciences, 2008

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Sarcopenia: European consensus on definition and diagnosis (2010, background): “Some have argued that the term dynapenia is better suited to describe age-associated loss of muscle strength and function [20].”
Sarcopenia, Dynapenia, and the Impact of Advancing Age on Human Skeletal Muscle Size and Strength; a Quantitative Review (2012, background): “The term dynapenia has been proposed to refer to the functional compromise of the entire neuromuscular apparatus (Clark and Manini, 2008) and although there is good evidence that this concept is of clinical significance (Clark and Manini, 2010) the term is yet to achieve widespread usage.”
The FNIH Sarcopenia Project: Rationale, Study Description, Conference Recommendations, and Final Estimates (2014, background): “entirely consistent, the weight of evidence in communitydwelling older adults suggests that (i) low muscle mass is associated with weakness (3), (ii) weakness (now often referred to as “dynapenia”) (4) is strongly associated with function and disability (5,6), but (iii) low muscle mass alone is weak”