Adaptation to sudden unexpected loading of the low back - the effects of repeated trials
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Adaptation to sudden unexpected loading of the low back - the effects of repeated trials. / Skotte, J.H.; Fallentin, N.; Pedersen, Mogens Theisen; Essendrop, Morten; Stroyer, J.; Schibye, Bente.
In: Journal of Biomechanics, Vol. 37, No. 10, 2004, p. 1483-1489.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Adaptation to sudden unexpected loading of the low back - the effects of repeated trials
AU - Skotte, J.H.
AU - Fallentin, N.
AU - Pedersen, Mogens Theisen
AU - Essendrop, Morten
AU - Stroyer, J.
AU - Schibye, Bente
N1 - PUF 2006 5200 159
PY - 2004
Y1 - 2004
N2 - The purpose of this study was to investigate short-term changes in reactions to sudden unexpected loading of the low back. The study utilized a set-up where a horizontal force of 58 N pointing forward suddenly was applied to the upper part of the subject's trunk. EMG activity from the erector spinae muscles and trunk movement data were recorded during 10 trials for 19 subjects. The analysis included EMG reaction time, mean rectified EMG amplitude during the period 50-250 ms after the sudden loading, and time elapsed until stopping of the forward movement of the trunk (stopping time). Reaction time means ranged from 66 to 97 ms (79+/-9 ms), and no difference was found between the trials. Conversely, the mean stopping time for the first trial (468 ms) was significantly higher than for trials 3-10 (359- 371 ms), and the average EMG amplitude during the period 50-250 ms after the sudden loading was lower for the first trial. This study showed that some subjects adapted to sudden unexpected loadings of the low back through a reduction in stopping time and a progression in EMG response during the first few trials. This possible adaptation to repeated trials have been overlooked in previous studies.
AB - The purpose of this study was to investigate short-term changes in reactions to sudden unexpected loading of the low back. The study utilized a set-up where a horizontal force of 58 N pointing forward suddenly was applied to the upper part of the subject's trunk. EMG activity from the erector spinae muscles and trunk movement data were recorded during 10 trials for 19 subjects. The analysis included EMG reaction time, mean rectified EMG amplitude during the period 50-250 ms after the sudden loading, and time elapsed until stopping of the forward movement of the trunk (stopping time). Reaction time means ranged from 66 to 97 ms (79+/-9 ms), and no difference was found between the trials. Conversely, the mean stopping time for the first trial (468 ms) was significantly higher than for trials 3-10 (359- 371 ms), and the average EMG amplitude during the period 50-250 ms after the sudden loading was lower for the first trial. This study showed that some subjects adapted to sudden unexpected loadings of the low back through a reduction in stopping time and a progression in EMG response during the first few trials. This possible adaptation to repeated trials have been overlooked in previous studies.
U2 - 10.1016/j.jbiomech.2004.01.018
DO - 10.1016/j.jbiomech.2004.01.018
M3 - Journal article
C2 - 15336922
VL - 37
SP - 1483
EP - 1489
JO - Journal of Biomechanics
JF - Journal of Biomechanics
SN - 0021-9290
IS - 10
ER -
ID: 440190