Objectives
To investigate the validity and reliability of two variants of the Sit Up Squat Stand Test (SUSS) and Hand Grip Strength (HGS) in predicting BMI and BMI risk level in hospitalised patients with Anorexia Nervosa (AN).
Methods
25 inpatients with AN were tested roughly weekly for up to 16 weeks. Muscle power was assessed by two independent researchers.
Results
Intra‐class coefficients (ICCs) indicated high Inter‐Rater Reliability (IRR) for the HGS (10 participants). Cohen's Kappa showed moderate IRR for the SUSS test (25 participants). Stepwise multiple regression showed that the SUSS tests plus HGS predicted BMI and BMI risk level explaining about two‐third of the variance. Each test individually had lower predictive value. There was a little difference between the two versions of the SUSS tested.
Conclusions
HGS and SUSS are valid and reliable measurements of muscle power in AN. Together, the SUSS tests and the HGS represent a useful and effective measure of muscle power and hence one aspect of physical risk in Anorexia Nervosa. In the light of Covid restrictions, the SUSS test is one way that physical state can be monitored on video link in a way that is hard to falsify.
The use of large baffle speaker system to produce infrasound/low frequency noise from wind turbines for subject medical testing was found to have issues in reproducing the original recorded signal. Reproducing the original transient time signal was not achieved. The use of synthesised signals for subjective testing of infrasound was examined and is discouraged when compared to actual real world sound files. The results of the testing and recommendation to use medical studies in the field rather than laboratory testing is discussed.
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