Sparing of muscle mass and function by passive loading in an experimental intensive care unit model

Guillaume Renaud, Monica Llano-Diez, Barbara Ravara, Luisa Gorza, Han Zhong Feng, Jian Ping Jin, Nicola Cacciani, Ann Marie Gustafson, Julien Ochala, Rebeca Corpeno, Meishan Li, Yvette Hedström, G. Charles Ford, K. Sreekumaran Nair, Lars Larsson

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


The response to mechanical stimuli, i.e. tensegrity, plays an important role in regulating cell physiological and pathophysiological function, and the mechanical silencing observed in intensive care unit (ICU) patients leads to a severe and specific muscle wasting condition. This study aims to unravel the underlying mechanisms and the effects of passive mechanical loading on skeletal muscle mass and function at the gene, protein and cellular levels. A unique experimental rat ICU model has been used allowing long-term (weeks) time-resolved analyses of the effects of standardized unilateral passive mechanical loading on skeletal muscle size and function and underlying mechanisms. Results show that passive mechanical loading alleviated the muscle wasting and the loss of force-generation associated with the ICU intervention, resulting in a doubling of the functional capacity of the loaded versus the unloaded muscles after a 2-week ICU intervention. We demonstrate that the improved maintenance of muscle mass and function is probably a consequence of a reduced oxidative stress revealed by lower levels of carbonylated proteins, and a reduced loss of the molecular motor protein myosin. A complex temporal gene expression pattern, delineated by microarray analysis, was observed with loading-induced changes in transcript levels of sarcomeric proteins, muscle developmental processes, stress response, extracellular matrix/cell adhesion proteins and metabolism. Thus, the results from this study show that passive mechanical loading alleviates the severe negative consequences on muscle size and function associated with the mechanical silencing in ICU patients, strongly supporting early and intense physical therapy in immobilized ICU patients.

Original languageEnglish (US)
Pages (from-to)1385-1402
Number of pages18
JournalJournal of Physiology
Issue number5
StatePublished - Mar 2013

ASJC Scopus subject areas

  • Physiology


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