Special issue on Eccentric muscle action_Editorial

1. The mysteries of eccentric muscle action

Special issue on Eccentric muscle action_Review

1. Why are muscles strong，and why do they require little energy in eccentric action？
2. Basic science and clinical use of eccentric contractions：History and uncertainties
3. Stretching the limits of maximal voluntary eccentric force production in vivo
4. Spinal and supraspinal control of motor function during maximal eccentric muscle contraction：Effects of resistance training
5. Biomechanical response of skeletal muscle to eccentric contractions

Special issue on Eccentric muscle action_Original article

1. Activation reduction following an eccentric contraction impairs torque steadiness in the isometric steady-state
2. Predictors of residual force enhancement in voluntary contractions of elbow flexors
3. Titin-mediated thick filament activation stabilizes myofibrils on the descending limb of their force-length relationship

Regular papers_Opinion

1. Encouraging kids to hop，skip，and jump：Emphasizing the need for higher-intensity physical activity in childcare
2. Establishing an anti-doping internal whistleblower policy in China

Regular papers_Original article

1. Reliability and validity of the French version of the Global Physical Activity Questionnaire
2. Parental social support，perceived competence and enjoyment in school physical activity
3. Evaluation of a concept-based physical education unit for energy balance education
4. The effect of fitness level on cardiac autonomic regulation，IL-6，total antioxidant capacity，and muscle damage responses to a single bout of high-intensity interval training
5. Does the McNeill Alexander model accurately predict maximum walking speed in novice and experienced race walkers?

1. Author biographies