By Peter Konrad
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Extra resources for The ABC of EMG. A Practical Introduction to Kinesiological Electromyography
Obliquus 7 = Int. Obliquus 8 = Rectus Fem. Flexion Fig. 80: Two clinical examples based on microvolt scaled RMS EMG analysis of muscle groups at video picture position. The left picture indicates EMG imbalance between the vasti within a knee stabilization task. The right pictures proves the appropriate innervation of lumbar stabilizers (multifidus, internal obliques) within a shoulder training exercise at a cable machine Extention Fig. 81: Left/Right comparison of average curves (left side=black/injured) of 4 knee muscles within a free squat movement sequence (6 reps) of a patient 4 weeks after ACL- rupture and surgery.
Typical ordinal amplitude scales are: No activity Moderate High absent inadequate excessive minus plus 2 x plus test with lowest activity ranking of test in between test with highest activity From a clinical and practical point of view the qualitative analysis (and interpretation) of EMG amplitudes is the probably most important and useful way of analyzing patient data. As discussed earlier (see “Drawbacks of MVC normalization”) patients typically cannot perform MVCs for amplitude normalization, and other normalization methods do not really create a benefit.
Second, it can be used to prove the efficiency of strength training exercises. Since FFT based Decline of med. frequency Muscle Fatigue Index calculations – from a mathematical point of view – need signal stationarity and a Gaussian distribution of samples, it is more the amplitude increase and its underlying motor fmed Start Middle End Fig. 77: Schematic illustration of the frequency shift towards lower frequencies in sustained contractions and calculation of the muscle fatigue index. Adopted and redrawn from De Luca unit recruitment that is used in dynamic movement patterns, such as strength training exercises.