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EUROPEAN JOURNAL OF PHYSICAL AND REHABILITATION MEDICINE
A Journal on Physical Medicine and Rehabilitation after Pathological Events
Official Journal of the , , , ,
In association with
Indexed/Abstracted in: CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 2,063
Europa Medicophysica 2000 March;35(1):31-8
Internal consistency, reproducibility & reliability of S-EMG testing
Sella G. E.
Ohio Valley Disability Institute, Martins Ferry, Ohio, USA
BACKGROUND: This study tested the hypothesis that 22 S-EMG dynamic protocols, repeated 3 times during one day on 5 subjects show good internal consistency, good test - re-test reproducibility and the study results are reliable when compared to the results of a large database.
METHODS: The investigation was a methodological study of 22 S-EMG dynamic protocols encompassing the 10 major joints of the body. The duration of each test was approximately 30 minutes. Each test was repeated 3 times within an 8 hour day. Setting: the study was conducted in a private physician’s clinic. Participants: the study was conducted with 5 adult volunteer subjects. None had any acute muscular symptom. However, 4 / 5 had clinical histories which included muscular dysfunction. Interventions: the S-EMG testing is not invasive. It did involve only movements performed at a minimally perceived level of effort. None of the testing was perceived as fatiguing by the participants. Measures: the statistical data gathered the following parameters: activity potential averages (x-), minimal resting potential averages (x-), standard deviation over 5 repetitions of the same motion or rest (SD) and coefficients of variation (CV) of the ratios of SD/x-for each motion. Statistics were gathered using the above parameters with the scope of defining the overall internal consistency of the whole study (CV), normalization of the activity and resting potentials averages by division by the average value for the group and presentation in the form of percentages for better comparability, reproducibility variables based on the normalized values for inter & intra-individual differences of testing over the 10 joints and reproducibility of the results over the 3 trials for resting and motion potentials. Reliability of the data from the study was measured by comparing the activity potential values with those obtained in a large database.
RESULTS: The overall results indicated the following: a) S-EMG 22 dynamic protocols involving the 10 major joints, performed by 5 subjects with 3 repetitions in any given testing day have a high degree of internal consistency, i.e. 96% in 94% of testing values; b) S-EMG testing done in the above conditions shows an overall degree of test - re-test reproducibility of £ 10%, whether the variables of repeatability are intra or inter-individual, over 10 joints for activity or resting potentials and over 3 trials; c) S-EMG testing results from the present study show a degree of reliability of 3% above the values of similar muscles found in a 198% larger database.
CONCLUSIONS: S-EMG dynamic protocols performed in the conditions described above show a high degree of internal consistency, test - re-test reproducibility and reliability in comparison with results from a large database.