Intensity is not time: reframing dose prescription in post-stroke neurorehabilitation

Abstract

Background Post-stroke neurorehabilitation remains predominantly prescribed according to session duration rather than biological effectiveness. However, converging evidence suggests that therapeutic intensity—defined as the density of neurofunctional stimulation per unit time—is the primary driver of neuroplastic adaptation and functional recovery. Objective To synthesize contemporary evidence demonstrating the superiority of intensity-centered over duration-centered rehabilitation paradigms and to propose a pragmatic framework for clinical implementation across heterogeneous healthcare contexts. Methods A structured synthesis of eleven contemporary studies (2010–2025) spanning randomized controlled trials, cohort studies, and integrative frameworks was conducted. Interventions modulating intensity through repetition density, neurophysiological load, temporal compression, and patient engagement were compared across high-income technological settings and low-resource family-mediated models. Results Across all paradigms, interventions delivering higher repetition density, greater neurophysiological demand, and temporal compression consistently yielded superior functional outcomes compared with duration-matched controls. These effects were independent of technological sophistication or resource availability. An operational formula, I = (R × L × E)/T , is proposed to quantify therapeutic intensity, where R = task-oriented repetitions, L = neurophysiological load (motor, proprioceptive, metabolic, and cognitive demand), E = proportion of repetitions above the adaptive engagement threshold, and T = effective session time. A structured implementation model—the 3P Framework (Personalize, Progress, Prevent)—is proposed to guide dose calibration across patient profiles and recovery phases. Conclusion Rehabilitation efficacy depends less on cumulative time than on the biological potency of stimulation delivered per unit time. The proposed 3P Framework—Personalize, Progress, Prevent—offers a pragmatic and evidence-based pathway to translate intensity science into routine clinical practice across patient phenotypes and care systems.