

THE SINCLAIR COEFFICIENTS FOR THE OLYMPIAD
ALBERTA WEIGHTLIFTING ASSOCIATION AFFILIATED WITH THE C.W.F.H.C. AND I.W.F.
The Sinclair Coefficients for the Olympiad
January 1, 2001 to December 31, 2004 For Men’s and Women’s
Olympic Weightlifting
The Sinclair coefficients are calculated in the Spring
of each Olympic year. They are derived statistically and are based on
the World Record Totals in the various bodyweight classes as of December
31 of the previous several years. The Answer to the question "What would
be the total of an athlete weighing x kg if he/she were an athlete in
the heaviest class of the same level of ability?" is given by the formula:
ACTUAL TOTAL x SINCLAIR COEFFICIENT = SINCLAIR
TOTAL 

Men 
Women 
A 
0.938573813 
1.005487664 
b 
157.141 kg 
112.811 kg 

2001.female.pdf
2001.Male.pdf
Comments
"An Olympic medal makes me walking on all four!"  Ruth
Ogbeifo (NGR)

I. The forms given above are suitable for a calculator.
As an example, suppose a male athlete weighing 83.5 kg has a total of
390 kg. For him: X = log10(83.5/157.141) = 0.274603037059 AX 2 = 0.070774874047
S.C. = 1.17699569414 Sinclair Total = 459.028 kg
II. In addition to the above, two tables are given, one for men and
one for women. In each table, the athlete’s bodyweight, x kg, appears
in the first column and the Sinclair coefficient in the Second. As noted
above, the Sinclair coefficients are derived statistically and are based
on the World Record Totals of mature athletes. This implies that the
athlete’s bodyweight, x kg, should not be too far below the upper limit
for the lightest bodyweight class. Nevertheless, as a guideline for
very young athletes who often are very light, the analytic curve 10
AX2 is extended to x = 32.0 for males and x = 28.0 for females.
III. Two graphs are appended, one for Men and one for Women. The curves
are generated by averaging the data over several years while the plotted
points show how the World Record Totals (or World Standards) compare
to this average at a particular point in time. To illustrate how this
can change over the course of an Olympiad, consider the 48 kg class
for the Senior Women. On December 31, 1999 the World Record Total is
195 kg and is held by Li Zhuo of China. From the graph this seems rather
low. But World Weightlifting, 1999/4, reports that Donka Mincheva of
Bulgaria has already done 92.5 + 120 = 212.5 kg in training. If performed
in a recognized competition, this result would yield a point much above
the curve for the 48 kg class. Note, however, that the curve itself
would be affected, but only to a slight degree due to the averaging
process in the statistical approach.
IV. The Sinclair coefficient for an athlete with a bodyweight of x kg
is the ratio of the World Record Totals of the heaviest athletes, averaged
over time, to the World Record Totals of the athletes with bodyweights
of x kg, averaged over time. The statistical approach tends to damp
out the influence of exceptionally high, or low, results.


