Table 5.
The volume of mitochondria – total and in the superficial and central intermyofibrillar space (IMF) and the sarcolemmal space (SS) – in the arm and leg muscles of elite cross-country skiers (n = 10).
| Participant | Arm (triceps brachii) | Leg (vastus lateralis) | ||||||
|---|---|---|---|---|---|---|---|---|
| Total | IMFSuperficial | IMFCentral | SS | Total | IMFSuperficial | IMFCentral | SS | |
| 1 | 9.7 | 10.2 | 4.1 | 0.21 | – | – | – | – |
| 2 | 10.1 | 9.8 | 5.2 | 0.28 | 7.1 | 6.6 | 4.4 | 0.20 |
| 3 | 12.7 | 11.5 | 5.8 | 0.53 | 9.4 | 9.2 | 4.3 | 0.29 |
| 4 | 9.4 | 9.0 | 2.9 | 0.38 | 9.1 | 7.9 | 4.6 | 0.41 |
| 5 | 8.1 | 6.7 | 5.3 | 0.34 | 8.1 | 7.9 | 4.4 | 0.23 |
| 6 | 5.6 | 5.8 | 2.4 | 0.13 | 6.2 | 5.7 | 3.6 | 0.21 |
| 7 | 7.4 | 6.8 | 5.5 | 0.19 | 9.3 | 9.2 | 4.7 | 0.25 |
| 8 | 10.6 | 10.1 | 4.7 | 0.36 | 11.8 | 11.0 | 7.0 | 0.37 |
| 9 | 8.6 | 7.6 | 5.9 | 0.29 | 8.8 | 8.9 | 3.9 | 0.24 |
| 10 | 8.0 | 7.7 | 2.4 | 0.33 | 7.6 | 6.9 | 4.5 | 0.25 |
| Mean | 9.0 | 8.5 | 4.4 | 0.31 | 8.6 | 8.1 | 4.6 | 0.27 |
| SD | 2.0 | 1.9 | 1.4 | 0.11 | 1.6 | 1.6 | 1.0 | 0.07 |
Total, total volume of mitochondria per volume of myofiber; IMFsuperficial, intermyofibrillar mitochondrial volume per volume of myofibrillar space in the superficial region of the myofiber; IMFcentral, intermyofibrillar mitochondrial volume per volume of myofibrillar space in the central region of the myofiber; SS, subsarcolemmal mitochondrial volume per area of myofiber surface. The individual values presented are the means for 8–12 myofibers in biopsies taken before and 22 h after the race. All data are given in volume densities (μm3 μm-3), except in the case of SS, where they are volume per SS area (μm3⋅μm-2).