Figure 5. PLFFD is associated with decreased tetanic [Ca²⁺]_i in WT but not in SOD2 overexpressing fibres.

Typical original records of force (top) and [Ca²⁺]_i (bottom) obtained in 30 Hz contractions produced in a WT (A) and a SOD2 overexpressing (B) fibre. Contractions were produced before (Control) and 30 min after (Recovery) fatiguing stimulation. Tetanic force and [Ca²⁺]_i in control are set to 100%.