Reconsidering exercise in critical care: Mechanisms, thresholds, and therapeutic intent

Area of Science:

• Critical care medicine
• Physical rehabilitation
• Exercise physiology

Background:

• Critical illness recovery presents significant physical sequelae.
• Despite decades of research, effective rehabilitation interventions remain poorly defined.
• Key knowledge gaps exist regarding patient selection, timing, and quantification of rehabilitation.

Purpose of the Study:

• To highlight the need for a theoretical framework for critical illness rehabilitation.
• To identify the specific components of exercise beneficial for patients recovering from critical illness.
• To guide the development of targeted rehabilitation strategies.

Main Methods:

• Literature review on critical care rehabilitation and exercise.
• Analysis of existing research gaps in physical function recovery.
• Conceptual framework development for exercise interventions.

Main Results:

• Limited progress in defining physical rehabilitation interventions for critical illness survivors.
• Lack of clarity on which patients benefit from rehabilitation and optimal intervention strategies.
• Absence of a theoretical basis for exercise's role in improving physical function.

Conclusions:

• Further research is essential to establish evidence-based rehabilitation protocols.
• Defining "exercise" in the context of critical illness is crucial for effective interventions.
• A theoretical framework is needed to advance the field of critical illness physical rehabilitation.