Muscle function

Muscle function is a broad physiological term describing the integrated capability of skeletal, cardiac, and smooth muscle tissues to generate force and perform mechanical work through contraction and relaxation cycles (6, 9). It is not a discrete molecular target, such as a specific receptor or enzyme; rather, it represents a complex phenotypic outcome resulting from the coordinated activity of structural proteins (e.g., myosin, actin), regulatory proteins (e.g., troponin, tropomyosin), and ion channels (e.g., ryanodine receptors) (1, 6). In drug discovery and clinical research, muscle function often serves as a primary endpoint or therapeutic goal for evaluating the efficacy of interventions for conditions like sarcopenia, Duchenne muscular dystrophy, and cancer-induced cachexia (2, 14). While various drugs are developed to enhance muscle performance by targeting specific molecular components—such as myostatin inhibitors (e.g., PF-354) or ryanodine receptor stabilizers (Rycals)—the term 'muscle function' itself refers to a biological process rather than a single targetable molecule (4, 10, 11). Consequently, it is classified as an incorrect entry for structured molecular target databases because it lacks a unique biochemical structure or direct drug-binding site (13). For precise target annotation, a specific molecular entity involved in this process, such as a signaling receptor or contractile protein, must be identified instead (2, 8).

Other names

Muscle performanceMuscle strengthContractile activityMotor function

Not applicable; muscle function is a physiological process/endpoint rather than a specific molecular target with a mechanism of action.