Weight Pulling: A Novel Mouse Model of Human Progressive Resistance Exercise

Area of Science:

• Exercise Physiology
• Muscle Biology
• Animal Models

Background:

• Progressive resistance exercise (PRE) is crucial for muscle health and performance in humans.
• Translating human PRE protocols to animal models is essential for mechanistic studies.
• Existing mouse models may not fully replicate the multi-joint and progressive nature of human PRE.

Purpose of the Study:

• To establish and validate a mouse model of PRE using weight pulling.
• To assess the translatability of human training paradigms to mice.
• To investigate the molecular and morphological adaptations to PRE in mice.

Main Methods:

• Mice underwent a weight-pulling protocol mimicking human PRE (3 sessions/week, 8-12 reps, progressive overload).
• Muscle mass, fiber hypertrophy, and myonuclear accretion were analyzed.
• Signaling pathways (mTORC1) and protein synthesis were measured post-exercise.

Main Results:

• Weight pulling significantly increased muscle mass across multiple muscle groups.
• Adaptations observed (fiber hypertrophy, myonuclear accretion) mirrored those in human studies.
• Acute responses, including mTORC1 activation and protein synthesis, were consistent with known drivers of muscle adaptation.

Conclusions:

• Weight pulling provides a highly translatable mouse model for studying PRE.
• This model allows for the investigation of molecular mechanisms underlying human resistance training adaptations.
• The findings support the use of this model for future research on muscle plasticity and exercise interventions.