Manual Therapy, Posturology & Rehabilitation Journal. ISSN 2236-5435. Copyright © 2017. This is an Open Access article
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Introduction to the Russo-Japanese revolution in stabilometry.
We knew that the postural system was concerned with the venous return circulation and the stabilization of the body, but we did
not know that the stabilometric signal was modified by the interference of these two functions. A new signal analysis is being made.
Keywords: Posturology; Stabilometry; Stability; Circulation; Signal analysis;
Corresponding author: Pierre-Marie Gagey; Institute of Posturology, 20 rue du Rendez-vous, 75012 Paris, France. e-mail: firstname.lastname@example.org
1 Institute of Posturology, 20 rue du Rendez-vous, 75012 Paris, France.
Financial support: The author declare no nancial support.
Submission date 02 March 2018; Acceptance date 03 May 2018; Publication date 02 July 2018
Since the studies by Inamura et al. were published(1–3), we
know that the postural system is also concerned with control
of the venous return circulaon (Figure 1).
The discovery of Inamura et al. did not change our approach
to stabilometry, which we pursued it from a purely mechanical
perspecve, in relaonship to the subject’s stability, without
being able to determine how to integrate this discovery into
our reecons. At that me, venous return was not a focus of
our interests; we were trying to gure out how to calculate the
posion of the center of gravity from the posion of the center
of pressure, which mobilized a large number of teams for
decades unl in 2016(4–15). Recently, V. Usachev and V. Belyaev
took on long-term stabilometric recordings (7 minutes).
They showed migraons, about every minute, of the average
point around which the center of pressure stabilizes during
this minute (Figure 2).
These displacements of the pressure zones on the plantar
sole, and, consequently, on Lejars’ venous sole(17,18) evoke
phenomena implicated in venous return, which remain to
be conrmed. But, on the other hand, the migraons, every
minute, of the mean point around which the center of pressure
stabilizes during that minute, have immediate consequences
on our concepon of stabilometric signal analysis. We can no
longer speak of X-means and Y-means, except in the mode
of approximate values because there are indeed a series of
dierent X-means and Y-means, and the X-mean and Y-mean
Figure 1 - Stabilogram/Plethysmogram Comparison; Inamura’s “one-minute wave”.
Note: A: Nine 1-minute recordings. Only the forward/backward stabilogram is shown, in phase opposion to the contours of the leg. B: Enlargement of a
part of A to show the connuity of the volume wave between the leg and thorax. This subject’s wave frequency is between 0.012 and 0.022 Hz. (Figure
reworked aer Inamura et al., 1990).
Russo-Japanese revolution in stabilometry MTP&RehabJournal 2018, 16: 584
that are computed on short recordings represent only singular
elements of this series. According to the video images, the
dierence would be more important between the Y-means
than between the X-means, which is in accordance with the
stascally known extents of the deviaons of the Y-means,
48 cm, and of the X-means, 2 cm, described in Normes 85(19).
We can no longer speak of measuring stability, since there
is no longer ONE mean equilibrium posion; remember that
stability is the property of a body that automacally returns
to the vicinity of ITS equilibrium posion, when it is displaced
CAN WE STILL TALK ABOUT “STABILOMETRY”?
The Russians and the Japanese already proposed
“stabilometric” parameters that take into account the
complexity of the signal coming from the force plaorms,
because that signal accounts for stability phenomena, along
with hemodynamic phenomena(20).
CONFLICT OF INTERESTING
The author declare no conict of interest.
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Figure 2 - One-minute movement summaries of a 7-minute stabilometric recording
Note: (From the video made by V. Belyaev(16)). A: Contour of the surface that will be occupied during the recording session by the pressure center displacements
by the end of the 7-minute recording. (To give a general overview of the framework of these movements). B: Tracing of the summarized movement of the
stabilizaon zone of the center of pressure during minute 1 (Freeze frame at the end of the rst minute). C: Tracing of the summarized movement of the
stabilizaon zone of the center of pressure during minute 2 (Freeze frame at the end of the second minute). D: Tracing of the summarized movement of the
stabilizaon zone of the center of pressure during minute 4: note the clear shi from the preceding zones (Freeze frame at the end of the fourth minute).
E: Global summary of the 7-minute recording of the nal frozen frame of the video.