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Table 1 Parameters of muscle strength assessed by handgrip measurements

From: Hand grip strength and fatigability: correlation with clinical parameters and diagnostic suitability in ME/CFS

Parameter/Ratio

Formula

Explanation

Fmax

Fmax [kg]

Maximum grip strength within one session (ten repeat trials)

Fmean

\(\frac{\sum 10\mathrm{ pulls }}{10}\)

Mean grip strength of all ten trials

Fatigue ratio (assessment of fatigability)

\(\frac{\mathrm{Fmax}}{\mathrm{Fmean}}\)

Higher values indicate stronger decrease of force during one session

Recovery ratio (assessment of recoverability)

\(\frac{\mathrm{Fmean}2}{\mathrm{ Fmean}1}\)

Low values indicate impaired recovery