Table 1 Estimate of the calcium content of the t-system before and after vacuolization.

From: Human skeletal muscle plasmalemma alters its structure to change its Ca2+-handling following heavy-load resistance exercise

Time from exercise (h)

t-sysVol, (%)

[Ca2+]t-sys (relative to t-system volume; mM)

[Ca2+]t-sys (relative to fibre volume; μM)

0 

1.4

1.4

19.6

24 

4.8

1.5*

72.0

48 

4.4

1.5*

66.0

  1. Values for t-sysVol and [Ca2+]t-sys from Figs 2 and 3, respectively. Note the t-sysVol is the transverse and longitudinal tubule volumes (1% fibre volume; calculated in pre-exercised fibres) plus the % fibre volume of the vacuoles (Fig. 2b). Bt-sys=1 (ref. 18) and is assumed not to increase with vacuolation. *The [Ca2+]cyto is expected to increase in the post-exercised muscle, causing [Ca2+]t-sys to increase slightly (Fig. 3).
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