GV-80 PHOTOGRAMMETRIC ENGINEERING
to measure this relationship angles PAT and APT (‘“g” and “h” under Side
View Image) were used. It appears from the studies made to date that the land-
marks used to determine the pelvic tilt need further study, as the change which
occurs in the size of the above two angles does not seem to differ greatly in
relation to the forward or backward tilt of the pelvis.
À pilot study was conducted on 100 individuals in the Freshman posture
class. In each case all postural measurements were made with use of the slide
which was projected on the screen. The results of the measurements which
seem to indicate real significance in analyzing body mechanics are given in
Table I.
TABLE I. RESULTS OF THE MEASUREMENTS
Means Range
Postural —_— — — —————
Measurement 1st 2nd Ist 2nd
Photograph Photograph Photograph Photograph
hdt 3.6 inches 3.2 inches 2:3 to 5.3" 2:3. to 5.3"
/ 17H 56.8? 60 .0? 44° to 69° 45° to 69°
ZHES7 86.9? 85.9? 83.5? to. 91? $1.5? to 90?
ZTKI 158.3? 165.0? 131? to 172° 135° to 180°
ZILS 158.0° 167.9? 131? to 171? 135° to 180?
PAT 57.5 54.3° 40.5? to- 77? 36.5? to 80.5?
ZAPT 47.0? 42.4? 35° to 62° 339 ^to 71?
129? to
Z Ac Ac 144 .4° 154.1°
130°. to 177? 178?
CONCLUSIONS
There is no question at all that the Photometric method of photography can
be a very definite asset to postural measurement because of the fact that an
overhead, as well as a side and back view, is available on the same exposure.
In the studies conducted at Yale University attempts were made to secure
every possible measurement which would appear to have a bearing on the
determination of postural alignment. As the studies progressed, however, a
number of the measurements taken proved to be of limited value for the analysis
of body mechanics. Those reported in Table I seem to indicate the most signifi-
cance at the present time.
NOTE: The writer acknowledges the help of Oscar W. Kiphuth and Norbert V. Pratt, mem-
bers of the Physical Education Department of Yale University, in compiling measurements used
in this study.
