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The majority of hand functionality assessment methods consist of the maximal voluntary grip force measurement.
However, biomechanical configuration of the distal arm and hand may influence the magnitude and stability of maximal voluntary grip force and varies across studies.
Maximal voluntary grip strength was measured 3 times in each hand using a Jamar dynamometer (Lafayette Instrument Company, USA) and a standard protocol [ 30].
We extended the analysis made in a previously published cohort of PD patients (Anzak et al., 2012) and age-matched healthy controls (Anzak et al., 2011b) to include behavioural measures of performance made later in a maximal voluntary grip and analysis of the corresponding LFP recorded in PD patients.
A final main effect model was calculated using stepwise linear regression to examine significant predictors for maximal voluntary grip strength among the independent variables: country of birth, age, height, weight, 25(OH D level, physical activity, gestational age, parity, and lactation status.
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In this study, the effects of grip-span, shoulder posture and anthropometric characteristics on endurance time of grip-force during sustained 30% of maximal voluntary grip-force were investigated.
We therefore recorded from the subthalamic nucleus region (STNr) in patients with Parkinson's disease (PD) as they made maximal voluntary grips.
Normal grip generated a force of 1.83 N, which was 2.8% of the maximum voluntary grip force.
Further analysis indicated a significant negative correlation between endurance time and rest pause and a marginal positive correlation between maximum voluntary grip-force and rest pause.
Isometric maximal voluntary strength was obtained with a reproducible standardized setup [ 24], measuring maximal voluntary handgrip, sitting shoulder elevation, shoulder abduction and back flexion and extension force [ 25].
Test of maximal voluntary isometric hand grip strength is performed for hand grip flexion of the dominant hand according to a standardised procedure [ 45].
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