Flexed postural tasks are frequently involved in daily activities, this paper evaluated a wide range of trunk muscle electromyogram (EMG) features to find the best feature spaces that discriminate among different trunk flexion angles. Using Davies-Bouldin index (DBI) and Calinski-Harabasz index (CHI) it was found that zero crossings, mean power frequency, median power frequency, and second order cumulants of extensor muscles' EMG, independent of holding load level and electrode location (right or left side of muscle) are the most sensitive features to trunk flexion angle variation.
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Calif State Univ East Bay, Kinesiol Dept, Hayward, CA USA
Univ Southern Calif, Div Biokinesiol & Phys Therapy, Los Angeles, CA USABrigham Young Univ, Dept Exercise Sci, Provo, UT USA
Rowley, K. Michael
Kurihara, Toshiyuki
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Ritsumeikan Univ, Dept Sport & Hlth Sci, Kusatsu, Shiga, JapanBrigham Young Univ, Dept Exercise Sci, Provo, UT USA
Kurihara, Toshiyuki
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McClung, Matthew
Tang, Jiaxi
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Univ Southern Calif, Div Biokinesiol & Phys Therapy, Los Angeles, CA USABrigham Young Univ, Dept Exercise Sci, Provo, UT USA
Tang, Jiaxi
Reischl, Steven
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Reischl Phys Therapy Inc, Signal Hill, CA USABrigham Young Univ, Dept Exercise Sci, Provo, UT USA
Reischl, Steven
Kulig, Kornelia
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Univ Southern Calif, Div Biokinesiol & Phys Therapy, Los Angeles, CA USABrigham Young Univ, Dept Exercise Sci, Provo, UT USA