Research studying high-intensity interval training has demonstracted changes in all of the following except: Insulin sensitivity. Body composition. Blood lipid profile. Blood pressure.

The question is asking which of the following options is not affected by high-intensity interval training according to research. The options are:

1. Insulin sensitivity.
2. Body composition.
3. Blood lipid profile.
4. Blood pressure.

To answer this question, we would need to look at research studies on high-intensity interval training.

1. Insulin sensitivity: High-intensity interval training has been shown to improve insulin sensitivity in some studies. This means that it is not the correct answer.

2. Body composition: High-intensity interval training can also affect body composition by reducing body fat and increasing muscle mass. So, this is not the correct answer.

3. Blood lipid profile: Some studies have shown that high-intensity interval training can improve the blood lipid profile, which includes factors like cholesterol levels. So, this is not the correct answer.

4. Blood pressure: High-intensity interval training has been shown to reduce blood pressure in some studies. So, this is not the correct answer.

Without more specific information or context, it's not possible to definitively answer this question. All of the options provided have been shown in various studies to be affected by high-intensity interval training.