This study demonstrated that, in
a standing posture, increasing the
degree of anterior pelvic tilt increased
the angle of lumbar lordosis
and increasing the degree of posterior
pelvic tilt decreased the angle of
lumbar lordosis. This is in agreement
with the observations of Day et al (4),
where the depth of lumbar lordosis
was shown to deepen during a voluntary
maximal standing anterior pelvic
tilt and to become more shallow during
a posterior pelvic tilt. The results
of Day et a1 are not directly comparable
with the present study, since they
defined the magnitude of the lumbar
lordosis as the depth of the curve at
its apex, rather than as an angular
change in the skin surface. The
present study has quantified the relationship
between pelvic tilt and lumtant in teaching subjects to maintain
a particular pelvic posture, such as
performing an anterior pelvic tilt
during lifting, thus increasing lumbar
lordosis, which decreases intradiscal
pressure (1 ) . The main limitation of the
present study is that it was performed
on a sample of college students who
were devoid of low back troubles.
The generalizability of the results is
therefore limited. This population
was chosen because it was felt that
the relationships first needed to be
investigated in normal individuals
before analyzing the more complex
relationships that may exist in individuals
with low back dysfunction.
This study demonstrated that, ina standing posture, increasing thedegree of anterior pelvic tilt increasedthe angle of lumbar lordosisand increasing the degree of posteriorpelvic tilt decreased the angle oflumbar lordosis. This is in agreementwith the observations of Day et al (4),where the depth of lumbar lordosiswas shown to deepen during a voluntarymaximal standing anterior pelvictilt and to become more shallow duringa posterior pelvic tilt. The resultsof Day et a1 are not directly comparablewith the present study, since theydefined the magnitude of the lumbarlordosis as the depth of the curve atits apex, rather than as an angularchange in the skin surface. Thepresent study has quantified the relationshipbetween pelvic tilt and lumtant in teaching subjects to maintaina particular pelvic posture, such asperforming an anterior pelvic tiltduring lifting, thus increasing lumbarlordosis, which decreases intradiscalpressure (1 ) . The main limitation of thepresent study is that it was performedon a sample of college students whowere devoid of low back troubles.The generalizability of the results istherefore limited. This populationwas chosen because it was felt thatthe relationships first needed to beinvestigated in normal individualsbefore analyzing the more complexrelationships that may exist in individualswith low back dysfunction.
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