title: Reexamination of the relationship between the surface integrated electromyogram (IEMG) and force of isometric contraction.
abstract: The integrated electromyogram (IEMG)--force relationships were studied in 26 physically active young men across the entire domain of forces in the elbow flexor group. All possible error factors (fatigue, muscle length, and co-contraction) were controlled to the greatest extent possible. The experimental conditions were more clearly defined than in previous experiments. The results confirm earlier observations of a linear relationship between IEMG and isometric force, under these experimental conditions and using a unipolar lead system. Highly significant correlations were found. Possible methodological error factors were studied. Bipolar recording produced a curvilinear, relationship which may explain some of the discrepancies of results reported in the literature.
mesh_terms: D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D004550:Elbow; D004576:Electromyography / Q000295:instrumentation; D005221:Fatigue; D006801:Humans; D007537:Isometric Contraction; D008297:Male; D008433:Mathematics; D009119:Muscle Contraction; D009129:Muscle Tonus; D009132:Muscles / Q000502:physiology; D005082:Physical Exertion