Fascia Is Able to Contract in a Smooth
Muscle-like Manner and Thereby Influence
Musculoskeletal Mechanics
R. Schleip1, W. Klingler1,2 and F. Lehmann-Horn1
1
Department of Applied Physiology, Ulm University, Germany
2
Department of Anesthesiology, Ulm University, Germany
Summary
With immunohistological analysis we demonstrate the presence of
myofibroblasts in normal human fasciae, particularly the fascia lata, plantar
fascia, and the lumbar fascia. Density was found to be highest in the lumbar
fascia and seems to be positively related to physical activity. For in vitro
contraction tests we suspended strips of lumbar fascia from rats in an organ
bath and measured for responsiveness to potential contractile agonists. With
the H1 antagonist mepyramine there were clear contractile responses; whereas
the nitric oxide donator glyceryltrinitrate induced relaxation. The measured
contraction forces are strong enough to impact upon musculoskeletal mechan-
ics when assuming a similar contractility in vivo.
Introduction
Fascia is usually considered to be a passive force transmitter in muscu-
loskeletal dynamics. Nevertheless the literature mentions indications for an
active contractility of fascia due to the presence of contractile intrafascial
cells (1, 2, 3). This study for the first time shows clear evidence, that human
fascia is able to actively contract and thereby may influence biomechanical
behavior.
Materials and Methods
Rodent, porcine and human tissue samples from different fasciae were
collected and used for the experiments according to the guidelines of the
©2006 by MEDIMOND S.r.l. G729C2414 51
52 5th World Congress of Biomechanics
ethics committee of Ulm University, Germany. Fascia samples from 32 hu-
man bodies (ages 17-91, 25 male, 7 female) were analyzed for the presence
of myofibroblast, by immunostaining for a-smooth muscle actin, which was
digitally quantified. Samples of lumbar fascia from rats and mice were used
for comparison. Additionally fresh samples of fascia were exposed to
mechanographic force registration under isometric strain in vitro. These were
conducted in an immersion bath and in a specifically modified superfusion
bath. Tissues were challenged mechanically, electrically and pharmacologically,
and changes in tissue tension were registered electronically. Unviable fascia
tissues were investigated to elucidate the cellular contribution.
Results
The histological examination revealed that myofibroblasts are present in
normal fasciae. The human lumbar fascia with its lattice-like fiber orientation
exhibits a higher myofibroblast density (Fig. 1), compared with other exam-
ined fasciae of both humans and rats. There is generally a large variance in
myofibroblast density between different persons. The data indicate a positive
correlation between myofibroblast density and physical activity.
It was shown that the increase in initial stiffness in response to repeated in
vitro stretching (as reported in the literature) was due to changes in matrix
hydration. No responses could be detected with electrical stimulation. How-
ever, smooth muscle-like contractions could be induced pharmacologically.
High dosages of the antihistaminic substance mepyramine had most reliable
and sustaining effects (n=29, p<0.05); while histamine and oxytocin induced
Fig. 1: Typical immunohistochemical section from human lumbar fascia. Arrows indicate
examples of stress fiber bundles containing a-smooth muscle actin (a differential marker for
myofibroblasts), which are stained in dark red. Length of image 225 µm.
Munich, Germany, July 29 - August 4, 2006 53
Fig. 2: Typical response curve of fascia to mepyramine. A bundle of rat lumbar fascia is
exposed to 250 x 10-3M mepyramine in a superfusion organ bath. To allow optimal tissue
saturation with the substance, the constant Krebs-Ringer (KR) irrigation is interrupted 2 min
before substance addition (Mep) and restarted again 2 min afterwards. The brief initial force
increase is due to temporary weight gain of the tissue due to the mepyramine solution, which
is then quickly washed off. Note the slow and sustained duration of the reaction, a typical
feature of fascial tissue response to mepyramine.
shorter contractile responses in selected fasciae only; and addition of an NO
donator triggered brief relaxation responses in several samples. No response
could be elicited with epinephrine, acetylcholine, and adenosine. The mepyramine
induced tissue contractions demonstrated very slow and enduring response
curves, lasting up to 2 h (Fig. 2). Since the histological examination had
revealed an increased myofibroblast density in endo- and perimysial intra-
muscular fasciae (4), mepyramine was additionally applied to whole muscular
tissue pieces including their fasciae, which showed similar contractile re-
sponse curves as pure fascia, apparently not due to myogenic contraction.
The maximal in vivo contraction forces were hypothetically calculated and
applied to the human lumbar area. The resulting forces are strong enough to
alter normal musculoskeletal behavior, such as mechanical joint stabilization
or Å‚-motor regulation.
Conclusions
These results suggest, that fascia is a contractile organ, due to the presence
of myofibroblasts. This ability is expressed on the one hand in chronic tissue
contractures which include tissue remodeling; and on the other hand in smooth
muscle-like cellular contractions over a time frame of minutes to hours, which
54 5th World Congress of Biomechanics
can be strong enough to influence low back stability and other aspects of
human biomechanics. This offers future implications for the understanding
and clinical management of pathologies which go along with increased or
decreased myofascial stiffness (such as low back pain, tension headache, spinal
instability, or fibromyalgia). It also offers new insights for treatments directed
at fascia, such as osteopathy, the Rolfing method of myofascial release, or
acupuncture. Further research on fascial contractility is indicated and prom-
ising.
References
(1) Yahia LH, Pigeon P, DesRosiers EA: Viscoelastic properties of the human lumbodorsal
fascia. J Biomed Eng 15: 425-429 (1993)
(2) Staubesand J, Li Y: Zum Feinbau der Fascia cruris mit besonderer Berücksichtigung
epi- und intrafaszialer Nerven. Manuelle Medizin 34: 196-200 (1996)
(3) Schleip R, Klingler W, Lehmann-Horn F: Active fascial contractility: fascia may
be able to contract in a smooth muscle-like manner and thereby influence mus-
culoskeletal dynamics. Med Hypotheses 65: 273-277 (2005)
(4) Schleip R, Naylor IL, Ursu D, Melzer W, Zorn A, Wilke HJ, Lehmann-Horn F,
Klingler W: Passive muscle stiffness may be influenced by active contractility of
intramuscular connective tissue. Med Hypotheses 66: 66-71 (2006)
This study has been supported by grants from the International Society of
Biomechanics (USA), the Rolf Institute of Structural Integration (USA), and
the European Rolfing Association e.V. (Germany).
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