Table 2.
Morphological, contractile, and mechanical data following 3 wk of diet and activity interventions
| n | EDL Length, Mm | EDL Mass, mg | CSA, mm2 | TPS, ms | HRT, ms | Pt, g/mm2 | Po, g/mm2 | PS, MPa | AS, MPa | |
|---|---|---|---|---|---|---|---|---|---|---|
| Diet | ||||||||||
| Normal | 16 | 10.0 (0.2) | 8.1 (0.2) | 0.78 (0.02) | 11.9 (0.3) | 25.7 (1.5) | 4.4 (0.2) | 21.3 (1.2) | 1.23 (0.11) | 1.64 (0.08) |
| GTE | 18 | 10.0 (0.1) | 8.3 (0.2) | 0.78 (0.02) | 12.6 (0.3) | 25.1 (1.4) | 4.1 (0.2) | 23.5 (1.2) | 1.39 (0.11) | 1.70 (0.07) |
| Activity | ||||||||||
| Sedentary | 16 | 9.6 (0.2) | 7.7 (0.2) | 0.76 (0.02) | 13.1 (0.3) | 26.7 (1.5) | 4.0 (0.2) | 20.5 (1.2) | 1.44 (0.11) | 1.52 (0.08) |
| Run | 18 | 10.4 (0.1)* | 8.7 (0.2)* | 0.80 (0.02) | 11.5 (0.3)* | 24.2 (1.4) | 4.5 (0.2) | 24.0 (1.2)* | 1.18 (0.11) | 1.82 (0.07)* |
| Treatment groups | ||||||||||
| SedNorm | 8 | 9.4 (0.2) | 8.0 (0.3)b | 0.80 (0.03) | 12.2 (0.4)b | 25.2 (2.1) | 4.1 (0.3) | 19.6 (1.7) | 1.16 (0.16) | 1.36 (0.12)b |
| RunNorm | 8 | 10.5 (0.2) | 8.3 (0.3) | 0.75 (0.03) | 11.7 (0.4)b | 26.3 (2.1) | 4.6 (0.3) | 22.9 (1.7) | 1.30 (0.16) | 1.93 (0.11)a |
| SedGTE | 8 | 9.7 (0.2) | 7.4 (0.3)b | 0.72 (0.03)b | 14.0 (0.4)a | 28.1 (2.1) | 3.9 (0.3) | 21.3 (1.7) | 1.72 (0.16)a | 1.69 (0.11) |
| RunGTE | 10 | 10.3 (0.2) | 9.1 (0.3)a | 0.84 (0.03)a | 11.3 (0.4)b | 22.2 (1.9) | 4.4 (0.2) | 25.2 (1.5) | 1.05 (0.14)b | 1.71 (0.1) |
Values are means (SE). CSA, cross sectional area; TPS, time to peak stress; HRT, half relaxation time; Pt, twitch stress; Po, tetanic stress; PS, passive parallel elastic stiffness; AS, active stiffness determined from stretch protocol.
*
Different from Sedentary (P < 0.05). Treatment means not followed by the same letter are significantly different (P < 0.05).