Artikel metabolic recruitment at different intensities

6 important questions on Artikel metabolic recruitment at different intensities

How does the assesment of recrutation by PCr/Cr work?

PCr is immediately split in Pi and CR upon muscle ACTIVATION
Several short activation burst can substantially decrease the PCr/CR ratio, thus making statistical test plausible.

Name some keywords of the article on PCr/CR

PCr/CR
Rate coding
Size principle
Muscle fiber type
MVC

Name a limitation of the use of biopsies and further contractile testing.

As supposed by an article on shortening induced deficits: the sarcomere inhomogeneity hypothesis holds strong AND removing fibers out of series DECREASES the both active and passive force generation of the muscle at that site.
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Name a limitation for the experiments done by Ruiter concerning maximal isometric contractions

According to Beltman et al. (2004) after seven MVCs the PCr/Cr ratios of all fibre populations had declined to values below the 5th percentile of resting values.

Therefore, multiple longterm isometric contractions elicit a high release of Pi which can inhibit further powerstrokes and thus account for force deficits.

Name, following up on Beltman et al. (2004), a limitation of the use of glycogen staining as a measure for fiber recruitment.

'When using glycogen depletion to study fibre activation it is difficult to separate the influence of exercise duration and intensity.'

Name some limitations in using the PCr/Cr technique:

  • resynthesis of PCR immediately after stimulation
  • limited number of participants

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