| to work | 14 | purpose |
| after exercise | 9 | temporal |
| like any muscle | 9 | other |
| heart → need → oxygen | 49 |
| heart → require → oxygen | 16 |
| heart → use → oxygen | 9 |
| heart → consume → oxygen | 4 |
| heart → take → oxygen | 3 |
| heart → rely on → oxygen | 3 |
| negative | neutral | positive |
| 0.245 | 0.589 | 0.166 |
| Raw frequency | 84 |
| Normalized frequency | 0.489 |
| Modifier score | 0.500 |
| Perplexity | 144.420 |