In the early winter of 1986, Fred Hatfiled’s (aka, Dr. Squat) quad strength was tested,
the full-range strength of his quadriceps muscles (leg-extension strength), not once,
but twice. He insisted on being tested; then, when the first test indicated a very low
level of strength in his quadriceps muscles, he was literally stunned by the results.
Then he insisted upon a second test that was conducted about 24 hours after the first
test. And, guess what? . . . his second test results were almost identical to the results
of the first test. And this was conducted in front of at least a dozen witnesses, mostly
medical doctors.
His intention, it is suspected, was a desire to show off, to show that he was far stronger
than any of the other subjects that had been tested. But, rather than being unusually
strong, he proved to be less than average in quadriceps strength with several women
who were stronger than he was, in spite of the fact that they weighed less than half
as much as he did. In addition to a very low level of strength in his quadriceps muscles,
Fred’s tests also indicated two other factors: One, he had enormous endurance in these
muscles; two, he showed very little fatigue from an exercise carried to a point of failure.
Both of which test results clearly indicate that he has a very high percentage of so-called
“slow-twitch” fibers in these muscles. A fiber type which also explains his low level of
quadriceps strength.
So . . . how could he squat with more than 1,000 pounds? Well, for one thing, what
they call a squat is in fact more like a half squat; certainly nothing close to a full squat.
Secondly, the quads are not the “prime mover” in such a so-called squat; yes, the
quads do contribute to squatting strength, but in fact the most important muscles in
that movement are those of the hips, the lower back and the rear of the thighs
(hamstrings). Fiber type in muscles is determined by genetics, and is not subject to
significant change, so it is not Fred’s fault that his quads are relatively weak; but such
fiber type is not consistent from one muscle to another, you may have primarily fast-
twitch fibers in one muscle and slow-twitch fibers in another muscle.
Given his ability in the squat, it is obvious that he has different fiber types in the other
muscles involved in a squat. If he had slow-twitch fibers in all of these muscles then he
would not be doing anything with 1,000 pounds . .. probably could not get up out of a
chair without help.