Strength Training to Contraction Failure Increases Voluntary Activation of the Quadriceps Muscle Shortly After Total Knee Arthroplasty: A Cross-sectional Study
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Strength Training to Contraction Failure Increases Voluntary Activation of the Quadriceps Muscle Shortly After Total Knee Arthroplasty : A Cross-sectional Study. / Mikkelsen, Elin Karin; Jakobsen, Thomas Linding; Larsen, Anders Holsgaard; Andersen, Lars Louis; Bandholm, Thomas.
In: American Journal of Physical Medicine and Rehabilitation, Vol. 95, No. 3, 03.2016, p. 194-203.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Strength Training to Contraction Failure Increases Voluntary Activation of the Quadriceps Muscle Shortly After Total Knee Arthroplasty
T2 - A Cross-sectional Study
AU - Mikkelsen, Elin Karin
AU - Jakobsen, Thomas Linding
AU - Larsen, Anders Holsgaard
AU - Andersen, Lars Louis
AU - Bandholm, Thomas
PY - 2016/3
Y1 - 2016/3
N2 - OBJECTIVE: The objective of this study was to investigate voluntary activation of the quadriceps muscle during one set of knee extensions performed until contraction failure in patients shortly after total knee arthroplasty.DESIGN: This was a cross-sectional study of 24 patients with total knee arthroplasty. One set of knee extensions was performed until contraction failure, using a predetermined 10 repetition maximum loading. In the operated leg, electromyographic (EMG) activity of the lateral and medial vastus, semitendinosus, and biceps femoris muscles was recorded during the set. Muscle activity (%EMGmax) and median power frequency of the EMG power spectrum were calculated for each repetition decile (10%-100% contraction failure).RESULTS: Muscle activity increased significantly over contractions from a mean of 90.0 and 93.6 %EMGmax (lateral vastus and medial vastus, respectively) at 10% contraction failure to 99.3 and 105.5 %EMGmax at 100% contraction failure (P = 0.009 and 0.004). Median power frequency decreased significantly over contractions from a mean of 66.8 and 64.2 Hz (lateral vastus and medial vastus, respectively) at 10% contraction failure to 59.9 and 60.1 Hz at 100% contraction failure (P = 0.0006 and 0.0187).CONCLUSION: In patients shortly after total knee arthroplasty, 10 repetition maximum-loaded knee extensions performed in one set until contraction failure increases voluntary activation of the quadriceps muscle during the set.CLINICAL TRIALS: Gov-identifier: NCT01713140 to the abstract to increase trial transparency.
AB - OBJECTIVE: The objective of this study was to investigate voluntary activation of the quadriceps muscle during one set of knee extensions performed until contraction failure in patients shortly after total knee arthroplasty.DESIGN: This was a cross-sectional study of 24 patients with total knee arthroplasty. One set of knee extensions was performed until contraction failure, using a predetermined 10 repetition maximum loading. In the operated leg, electromyographic (EMG) activity of the lateral and medial vastus, semitendinosus, and biceps femoris muscles was recorded during the set. Muscle activity (%EMGmax) and median power frequency of the EMG power spectrum were calculated for each repetition decile (10%-100% contraction failure).RESULTS: Muscle activity increased significantly over contractions from a mean of 90.0 and 93.6 %EMGmax (lateral vastus and medial vastus, respectively) at 10% contraction failure to 99.3 and 105.5 %EMGmax at 100% contraction failure (P = 0.009 and 0.004). Median power frequency decreased significantly over contractions from a mean of 66.8 and 64.2 Hz (lateral vastus and medial vastus, respectively) at 10% contraction failure to 59.9 and 60.1 Hz at 100% contraction failure (P = 0.0006 and 0.0187).CONCLUSION: In patients shortly after total knee arthroplasty, 10 repetition maximum-loaded knee extensions performed in one set until contraction failure increases voluntary activation of the quadriceps muscle during the set.CLINICAL TRIALS: Gov-identifier: NCT01713140 to the abstract to increase trial transparency.
KW - Aged
KW - Arthroplasty, Replacement, Knee
KW - Cross-Sectional Studies
KW - Electromyography
KW - Female
KW - Humans
KW - Isometric Contraction
KW - Joint Diseases
KW - Knee Joint
KW - Male
KW - Middle Aged
KW - Muscle Fatigue
KW - Quadriceps Muscle
KW - Range of Motion, Articular
KW - Resistance Training
KW - Weight-Bearing
U2 - 10.1097/PHM.0000000000000361
DO - 10.1097/PHM.0000000000000361
M3 - Journal article
C2 - 26339729
VL - 95
SP - 194
EP - 203
JO - American Journal of Physical Medicine and Rehabilitation
JF - American Journal of Physical Medicine and Rehabilitation
SN - 0894-9115
IS - 3
ER -
ID: 173810775