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. Author manuscript; available in PMC: 2009 Jan 1.
Published in final edited form as: Exp Gerontol. 2007 Dec 3;43(1):5–10. doi: 10.1016/j.exger.2007.10.008

Figure 2. M-mode traces prepared from high speed movies of dissected flies.

Figure 2

A 1 pixel-wide region with both edges of the heart tube is defined in a single movie frame. Same regions are electronically cut from all of the frames in the movie and aligned horizontally to produce the trace. A regular heart beat is seen in young flies (at 1 week of age; top trace). Arrhythmic heart beats are evident in old flies (at 5 weeks of age; bottom trace). For quantitative analysis, see Ocorr et al 2007a.