Fig. 7. Kinematics of the I2 muscle during swallowing. Data in A-D are plotted as
length (mm) as a function of time (ms). (A) I2 kinematics in the first
swallow. The first sequence from the images in set 7725 starts with image 27
and ends with image 44. The onset of the t4 period is frame 27, the
onset of the t1 period is frame 32 and the onset of the t2
period is frame 41; each of these period onsets is indicated using a vertical
line. For definitions of periods t1, t2 and t4, see
Materials and methods. (B) I2 kinematics in the second swallow. The second
sequence from the images in set 7725 starts with image 45 and ends with image
67. The onset of the t4 period is frame 45, the onset of the
t1 period is frame 53 and the onset of the t2 period is
frame 63. (C) I2 kinematics in the third swallow. The first sequence from the
images in set 7732 starts with image 16 and ends with image 39. The onset of
the t4 period is frame 16, the onset of the t1 period is
frame 26 and the onset of the t2 period is frame 35. (D) I2
kinematics in the fourth swallow, whose individual images are shown in
Fig. 5. The second sequence
from the images in set 7732 starts with image 39 and ends with image 60. The
onset of the t4 period is frame 39, the onset of the t1
period is frame 47 and the onset of the t2 period is frame 56. (E)
Normalized, averaged and smoothed I2 kinematics during swallowing cycle. Data
are shown as the mean ± 1 S.D. (F) Normalized and averaged data from a
transilluminated slug (replotted from
Drushel et al., 1998) (the
cycle starts at t4, and cycle length is renormalized to be the sum of
the t4, t1 and t2 periods, excluding the
t3 period). (G) Schematic diagrams indicating the length of I2
plotted in D for frames 1, 9, 18 and 22. I2 is highlighted with a black line.
Compare original frames in Fig.
5.
