Table 2.
Exercise characteristics
| TYPE I |
TYPE II |
|||
|---|---|---|---|---|
| DMI | CONI | DMII | CONII | |
| Isometric exercise | n = 15 | n = 15 | n = 16 | n = 16 |
| MVC, N | 247 ± 13 | 240 ± 17 | 213 ± 19 | 225 ± 17 |
| Peak BOLD force, N | 227 ± 12 | 220 ± 15 | 202 ± 19 | 212 ± 17 |
| Tension time integral, N·s, per contraction | 254 ± 21 | 251 ± 23 | 213 ± 27 | 235 ± 86 |
| Dynamic exercise | n = 11 | n = 11 | n = 13 | n = 13 |
| Initial force, %MVC | 37.6 ± 2.2 | 40.7 ± 2.8 | 42.1 ± 3.0 | 38.4 ± 2.3 |
| Fatigue, %initial force | 7.4 ± 3.1 | 13.0 ± 3.9 | 15.4 ± 2.9 | 17.2 ± 4.1 |
| Tension time integral, N·s, sum of all contractions | 4818 ± 395 | 4897 ± 438 | 3622 ± 416 | 3898 ± 316 |
| T2, % change | 9.0 ± 0.9 | 9.5 ± 0.9 | 8.4 ± 1.1 | 7.8 ± 1.0 |
| Heart rate (rest)* | 67 ± 3 | 59 ± 3 | 79 ± 2 | 68 ± 4 |
| Heart rate postexercise,* beats/min | 68 ± 2 | 61 ± 3 | 80 ± 3 | 69 ± 3 |
Values are means ± SE. Exercise characteristics during dorsiflexion isometric exercise (single contractions) performed during acquisition of blood oxygen level-dependent (BOLD) MRI sequence and for a 2-min bout of dynamic exercise. MVC, maximal voluntary contraction. BOLD force is the average force during functional BOLD imaging. DM groups had greater heart rate at rest and following exercise
*
P < 0.05, DM > CON.