To be able to standardize the force exerted by a single subject.
These figures would be affected very significantly by age and sex. There may however be no data.
The answer is nowhere. It is not possible to measure in situ or ex vivo force production for human muscles like you can in muscles of small animals. You can calculate a muscle's force production if you know the torque production about a joint and what the moment arm is for that muscle/joint. However, this assumes that agonists and antagonists are not contributing to the torque production. I know of no situation in which a human can voluntarily activate just one muscle. Probably your best estimate of a muscle's force producing capacity will come from the physiological cross-sectional area estimate for a muscle and knowing that normal force production is ~15-20 N/cm2. The book (Skeletal Muscle Structure, Function, & Plasticity by Richard L. Lieber) has physiological cross-sectional area estimates for 22 upper-limb and 27 lower-limb muscles.
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