Is hand immobility a symptom of carpal tunnel syndrome?

Through my research, I have noticed that the common symptoms ociated with this condition are numbness, tingling in the hand, sharp pains, etc. I don't display any of these symptoms. However, whenever I try to type or play guitar my hand doesn't function right. It is almost like I get a pressure (somewhere around the base of my thumb) that won't go away during these activities. Ultimately, the fingers of my hand will form into awkward positions and won't work in the way that they once did. It doesn't really hurt, but after long periods of typing my fingers become less responsive and tend to wear out. I have had an EMG Test performed on my hand to see if I tested positive for carpal tunnel. The test came up negative, however, the doctor said that 10% of carpal tunnel cases won't be detected by the EMG Test. Likewise, he also said that the test doesn't always pick up carpal tunnel in its early stages. Does this sound like an effect of carpal tunnel or is it the symptoms of something else?