Hi Katelynn,
I did a quick literature search and wasn’t able to find the case study you’re referring to. Please send it along if you can find it. My suspicion is that the 30-year-old runner with MS experienced more weakness and poorer scores at the end of exercise sessions where she was engaging in moderate-high intensity exercise.
The patient in this case participated in only balance and functional testing, which I doubt would be enough to cause such a dramatic drop in a person with MS’s MMT scores unless they were in an active relapse.
The extreme fluctuations in fatigue and weakness within a short period of time are the hallmark of myasthenia gravis.