TABLE 2.
Body composition parameters before and after 2‐, 4‐, or 6‐wk HIIT, or a no intervention control period
| Group | Before HIIT | After HIIT | Change | P value |
|---|---|---|---|---|
| Control LM (Kg) | 49.9 (5.4) | 49.9 (5.0) | +0.0 (1.2) | 1.0 |
| 2‐wk LM(Kg) | 43.9 (8.6) | 44.5 (2.8) | +0.5 (0.7) | 0.36 |
| 4‐wk LM(Kg) | 44.6 (10.9) | 44.7 (10.8) | +0.1 (1.1) | 1.0 |
| 6‐wk LM(Kg) | 48.3 (11.2) | 48.4 (11.3) | +0.2 (0.8) | 0.98 |
| Control FM% | 29.5 (7.3) | 29.5 (6.8) | 0.0 | 1.0 |
| 2‐wk FM% | 32.7 (7.1) | 32.2 (7.0) | −0.5 (0.9) | 0.55 |
| 4‐wk FM% | 32.0 (10.1) | 31.7 (9.6) | +1.7 (0.6) | 0.91 |
| 6‐wk FM% | 38.0 (6.3) | 37.4 (6.2) | −0.5 (0.7) | 0.43 |
| Control LLM (Kg) | 15.5 (4.1) | 15.7 (4.4) | +0.2 (1.6) | 1.0 |
| 2‐wk LLM (Kg) | 14.3 (3.1) | 14.6 (3.1) | +0.3 (0.4) | 0.97 |
| 4‐wk LLM (Kg) | 14.6 (4.2) | 14.4 (4.3) | −0.2 (0.6) | 1.0 |
| 6‐wk LLM (Kg) | 13.4 (2.0) | 14.0 (3.4) | +0.7 (2.7) | 0.63 |
Analysis via dual‐energy x‐ray absorptiometry. Data are presented as mean(SD). P values represent change from before HIIT to after HIIT via two‐way repeated‐measures analysis of variance with Sidak’s multiple comparisons post hoc testing.
Abbreviations: FM%, whole‐body fat percentage; HIIT, high‐intensity interval training; LLM, leg lean mass; LM, whole body lean mass.