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您的检索式：作者名="Stephan Kopinski"
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| 1 | Neuromuscular trunk activation patterns in back pain patients during one-handed lifting显示文摘AIM To analyze neuromuscular activity patterns of the trunk in healthy controls(H) and back pain patients(BPP) during one-handed lifting of light to heavy loads. METHODS After assessment of back pain(graded chronic pain scale according to von Korff) all subjects(n = 43) performed a warm-up(treadmill walking). Next, subjects were instructed to lift 3 × a 20 kg weight placed in front of them(with both hand) onto a table(height: 0.75 m). Subsequently, all subjects lifted with one hand(left-side, 3 repetitions) a weight of 1 kg(light), 10 kg(middle) and 20 kg(heavy) in random order from the ground up onto the table left of them. Trunk muscle activity was assessed with a 12-lead EMG(6 ventral/6 dorsal muscles; 4000 Hz). EMG-RMS(%) was averaged over the 3 repetitions and analyzed for the whole one-handed lifting cycle, then normalized to RMS of the two-handed lifting. Additionally, the mean(normalized) EMG-RMS of four trunk areas [right/left ventral area(VR/VL); right/left dorsal area(DR/DL)] was calculated. Data were analyzed descriptively(mean ± SD) followed by student's t-test comparing H and BPP(α = 0.05). With respect to the unequal distribution of subjects in H and BPP, a matched-group analysis was conducted. Seven healthy controls were gender- and age-matched(group H_(matched)) to the 7 BPP. In addition, task failure was calculated and compared between H/H_(matched) vs BPP using χ~2. RESULTS Seven subjects(3m/4f; 32 ± 7 years; 171 ± 7 cm; 65 ± 11 kg) were assigned to BPP(pain grade ≥ 2) and 36(13m/23f; 28 ± 8 years; 174 ± 10 cm; 71 ± 12 kg) to H(pain grade ≤ 1). H and BPP did not differ significantly in anthropometrics(P > 0.05). All subjects were able to lift the light and middle loads, but 57% of BPP and 22% of H were not able to lift the heavy load(all women). χ~2 analysis revealed statistically significant differences in task failure between H vs BPP(P = 0.03). EMG-RMS ranged from 33% ± 10%/30% ± 9%(DL, 1 kg) to 356% ± 148%/283% ± 80%(VR, 20 kg) in H/BPP with no statistical difference between groups regardless of load(P > 0.05). However, the EMG-RMS of the VR was greatest in all lifting tasks for both groups and increased with heavier loads. CONCLUSION Heavier loading leads to an increase(2- to 3-fold) in trunk muscle activity with comparable patterns. Heavy loading(20 kg) leads to task failure, especially in women with back pain. | Juliane Mueller Tilman Engel Stephan Kopinski Frank Mayer Steffen Mueller | 2017 | World Journal of Orthopedics2017，8，2： | 0 |
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