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. 2006 Jan 6;90(7):2427–2435. doi: 10.1529/biophysj.105.075184

FIGURE 4.

FIGURE 4

Power generation by maximally activated IFM fibers at 15°C. Power generated by EMB, EMB-7d, IFI, and IFI-7a muscle fibers when oscillated at 0.25% peak-to-peak strain over a frequency range of 0.5–250 Hz. Note the separate y-axis scale for EMB and EMB-7d. EMB and EMB-7d fibers generate less power than IFI and IFI-7a fibers, since these fibers are from flies <2 h-old (see text). The EMB and EMB-7d y axis has been scaled so that if one reads the power values from the IFI y axis this would be approximately the amount of power generated by EMB and EMB-IR fibers if they were the same age as 2-day-old IFI and IFI-ER fibers. The scaling is based on a previous comparison of <2-h-old fibers from EMB and IFI flies (9). WBF of IFI flies (Table 1) is indicated (vertical dashed line) at the corresponding muscle oscillation frequency. EMB and EMB-7d fibers cannot generate power over the normal range of wing-beat frequencies that support flight.