[Thermodynamic muscle cycles]

Area of Science:

• Thermodynamics
• Muscle Physiology
• Biophysics

Context:

• Muscle contraction is analyzed as a thermodynamic cycle.
• The concept of non-equilibrium energy accumulation is applied.
• Temperature-entropy relationships in biological systems are explored.

Purpose:

• To investigate the energetic advantages of muscle contraction cycles under different temperature-entropy conditions.
• To explore the implications of non-equilibrium thermodynamics on muscle function.
• To understand the role of ATPase activity nonlinearity in muscle efficiency.

Summary:

• Muscle thermodynamic cycles can be more energetically advantageous at negative absolute temperatures if entropy increases during redistribution.
• Conversely, cycles are more favorable at positive absolute temperatures if entropy decreases.
• Non-linear ATPase activity creates a "Maxwell quasidemon" effect, enhancing overall muscle efficiency.

Impact:

• Provides insights into the fundamental thermodynamic principles governing muscle contraction.
• Suggests potential for optimizing biological energy conversion processes.
• Highlights the complex interplay between temperature, entropy, and enzymatic activity in biological systems.