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Maximal isometric twitch force (Pt) and maximal tetanic force (Po), normalized to physiological cross-sectional area, of midcostal diaphragm muscles of mice across the lifespan (aged 6, 18 and 24 months)
Data were analysed by one-way ANOVA (P < 0.001 for both Pt and Po). *Significantly different from 6-and 18-month-old mice.
