Strength Training to Contraction Failure Increases Voluntary Activation of the Quadriceps Muscle Shortly After Total Knee Arthroplasty: A Cross-sectional Study

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 - 2015/9/3

Y1 - 2015/9/3

N2 - Mikkelsen EK, Jakobsen TL, Holsgaard-Larsen A, Andersen LL, Bandholm T: Strength training to contraction failure increases voluntary activation of the quadriceps muscle shortly after total knee arthroplasty: A cross-sectional study. Am J Phys Med Rehabil 2016;95:194Y203. 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 extensionswas 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%Y100% 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 maximumYloaded 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 - Mikkelsen EK, Jakobsen TL, Holsgaard-Larsen A, Andersen LL, Bandholm T: Strength training to contraction failure increases voluntary activation of the quadriceps muscle shortly after total knee arthroplasty: A cross-sectional study. Am J Phys Med Rehabil 2016;95:194Y203. 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 extensionswas 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%Y100% 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 maximumYloaded 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

SN - 0894-9115

VL - 95

SP - 194

EP - 203

JO - American Journal of Physical Medicine and Rehabilitation

JF - American Journal of Physical Medicine and Rehabilitation

IS - 3

ER -