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Fig. 5.21 Older people tend to walk with a greater side-to-side
movement of the head due to the decreasing ability of the hips
and waist to accommodate shifting weight. Teenagers tend to
walk with the head steady in the right-left dimension, but not
infrequently their heads will shift up and down as they walk, due to
chronic tension in the flexors of the hips.
Fig. 5.20 The intercostals can be seen as operating like a watch
spring, winding and unwinding the rib cage reciprocally with each
step. As you take a step forward with the right foot and the rib
cage rotates to the left, the external intercostals on the right are
being contracted, while the internal intercostals on the left are
contracting to create the movement. Their complements are being
stretched, preparing to take the rib cage back the other way.
(DVD ref: body Heading 101)
'marched', to shift their weight from one foot entirely
onto the other, causing their heads to move from side to
side. The teenagers carrying the instruments were doing
just fine on the side-to-side accommodation, but (we
surmise) the collision between increased hormone levels
and Britain's general reticence about sex had possibly
caused a little tension in the hip flexors at the front of
the pelvis, so that all the up and down motion in the
feet was being transferred right through the hip up to
the spine and head.
Whatever the cause, the veterans were exhibiting LL
problems as a group, and the teenagers were showing
SBL and SFL restrictions.
smooth out the complexities of walking. In this way, we can
see the slanted direction of the intercostals as acting almost
like a watch spring, storing up potential energy when the rib
cage is twisted one way, releasing it into kinetic energy as the
rib cage rotates in the other direction (Fig. 5.20). I have found
interesting results considering the intercostals primarily as
muscles of walking rather than as muscles of breathing
(an idea first given to me by Jon Zahourek of Zoologik
Lateral vs sagittal movement
In the early 1980s, in a suburb near London, I was just
beginning a Saturday seminar to a group of aerobic
instructors when the cheerful cacophony of a school
band drowned me out. I went over to the window to
see, and called my students over to witness a simple but
telling phenomenon. We were looking down from the
6th floor at a Remembrance Day parade. From above,
we could see the parade starting out, with the heads of
the World War II veterans clearly moving from side to
side, while the heads of the teenage band members were
clearly bobbing up and down (Fig. 5.21).
The message was clear: the older veterans had dimin-
ished accommodation in the lateral lines around the
waist (and perhaps some degenerative arthritis in their
hips as well). They were thus compelled, as they
Discussion 3
The Lateral Line and seduction
If presenting the SFL, in all its sensitivity and erogenous zones
(see Ch. 4, Discussion 2, p. 112) is essentially a statement of
trust, or a 'Yes', and presenting the SBL, the carapace ('turning
your back') is essentially an expression of protection, or 'No',
what is the meaning of the presentation of the side, or Lateral
Line? The answer is 'Maybe'. Therefore, presentation of the
Lateral Line can be associated with the complex reeling in
known as seduction. This ties into issues that link safety to
sensuality and sexuality. Any perusal of the ads or fashion
shoots in Vogue or the Sunday Fashion Supplements will
reveal how often presentation of the body's side is used to sell
clothes, perfume, jewelry, make-up, or the other accoutre-
ments of the play of seduction (Fig. 5.22). (This psychobiologi-
cal idea comes courtesy of Anatomy Trains instructor James
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