Inter-rater reliability of measuring mechanical properties of rectus femoris and biceps brachii in young males using a new portable device (MyotonPRO)

Agyapong-Badu, Sandra, Warner, Martin, Samuel, D. and Stokes, M. (2012) Inter-rater reliability of measuring mechanical properties of rectus femoris and biceps brachii in young males using a new portable device (MyotonPRO). Proceedings of CSP Congress, 22-22.


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Objective measurement of mechanical properties of skeletal muscles in a clinical setting is difficult. The present study examined inter-rater reliability of a new portable device for objective testing. Relevance Clinical measures of mechanical properties, such as muscle tone, are subjective. An objective tool would enable accurate assessment and monitoring of treatment efficacy.


Twenty one healthy men aged 20-35 years (mean 25.9, SD 4.4) with body mass index of 23.9 kg/m2 (SD 2.5) were studied.


Mechanical properties of rectus femoris (RF) and biceps brachii (BB) muscles on the dominant side were tested with the participant in relaxed supine lying. The MyotonPRO device was placed on the relevant muscle belly and applied mechanical taps which induced muscle oscillations, from which frequency (tone; Hz),decrement (elasticity; log), and stiffness (N/m) were measured. Two sets of 10 taps were applied to each muscle (mean of the two used for analysis) by two novice raters.


Data were analysed using SPSS 18. Intraclass correlation coefficients (ICC) were used to assess intrarater within session reliability (ICC3,2) and between rater reliability (ICC3,1).


Test-retest reliability for each rater in both muscles was excellent (ICC3,2 0.94-0.99). Inter-rater reliability was excellent for all RF parameters (ICC3,1 decrement 0.95; frequency 0.93; stiffness 0.92) and good to excellent for BB parameters (ICC3,1 decrement 0.78; frequency 0.84; stiffness 0.94).


The MyotonPRO device demonstrated excellent within-session intra-rater reliability and good to excellent inter-rater reliability for RF and BB in asymptomatic young males. Reliability needs to be established between days and for other muscles in healthy and clinical populations. Implications These findings demonstrate that different raters can obtain similar measurements for BB and RF muscles using the MyotonPRO in healthy young males. The device is therefore a potentially valuable tool for objective assessment of muscle in clinical and research settings.

Item Type: Article
Related URLs:
Keywords: reliability, skeletal muscle, mechanical properties
Subjects: Q Science > QP Physiology
R Medicine > RM Therapeutics. Pharmacology
Divisions: Faculty of Health Sciences
ePrint ID: 344513
Date Deposited: 23 Oct 2012 13:30
Last Modified: 27 Mar 2014 20:26

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