There are several tools (e.g. WAIS, TIB, etc..) to measure cognitive reserve in patients with neurological conditions. Is there any tool (questionnaire) to measure the pre-morbid motor reserve?
Not sure, but I would think that any tests of endurance or coordination/agility could be used for this purpose. Same principle: If you have more than you need, then you can afford to lose a bit and still function.
This is a really interesting question. Typically to calculate cognitive reserve you utilise a composite of several proxy's (education, job complexity, NART, WAIS, ANART, Social Network Index, Cognitive Leisure Scale etc). Perhaps you could create a motor reserve consisting of several proxy's (cardiorespiratory fitness [V02, 6MWT], compendium of physical activities or IPAQ, 1, 6 15 repetition maximum, exercise level history). This is something we are looking into for Huntington's disease. But we are similarly having trouble, particularly with proxy's.
Interesting question! Although I have no ready answer, one could try to create a questionnaire of motor-related previous activities (e.g., hobbies, sports, athletic achievements, means of transportation used such use biking, footing, etc.)