Muscle activity during knee-extension strengthening exercise performed with elastic tubing and isotonic resistance

Markus Due Jakobsen, Emil Sundstrup, Christoffer H Andersen, Thomas Bandholm, Kristian Thorborg, Mette K Zebis, Lars L Andersen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

BACKGROUND/PURPOSE: While elastic resistance training, targeting the upper body is effective for strength training, the effect of elastic resistance training on lower body muscle activity remains questionable. The purpose of this study was to evaluate the EMG-angle relationship of the quadriceps muscle during 10-RM knee-extensions performed with elastic tubing and an isotonic strength training machine.

METHODS: 7 women and 9 men aged 28-67 years (mean age 44 and 41 years, respectively) participated. Electromyographic (EMG) activity was recorded in 10 muscles during the concentric and eccentric contraction phase of a knee extension exercise performed with elastic tubing and in training machine and normalized to maximal voluntary isometric contraction (MVC) EMG (nEMG). Knee joint angle was measured during the exercises using electronic inclinometers (range of motion 0-90°).

RESULTS: When comparing the machine and elastic resistance exercises there were no significant differences in peak EMG of the rectus femoris (RF), vastus lateralis (VL), vastus medialis (VM) during the concentric contraction phase. However, during the eccentric phase, peak EMG was significantly higher (p<0.01) in RF and VM when performing knee extensions using the training machine. In VL and VM the EMG-angle pattern was different between the two training modalities (significant angle by exercise interaction). When using elastic resistance, the EMG-angle pattern peaked towards full knee extension (0°), whereas angle at peak EMG occurred closer to knee flexion position (90°) during the machine exercise. Perceived loading (Borg CR10) was similar during knee extensions performed with elastic tubing (5.7±0.6) compared with knee extensions performed in training machine (5.9±0.5).

CONCLUSION: Knee extensions performed with elastic tubing induces similar high (>70% nEMG) quadriceps muscle activity during the concentric contraction phase, but slightly lower during the eccentric contraction phase, as knee extensions performed using an isotonic training machine. During the concentric contraction phase the two different conditions displayed reciprocal EMG-angle patterns during the range of motion.

LEVEL OF EVIDENCE: 5.

OriginalsprogEngelsk
TidsskriftInternational Journal of Sports Physical Therapy
Vol/bind7
Udgave nummer6
Sider (fra-til)606–616
ISSN2159-2896
StatusUdgivet - 2012

Fingeraftryk

Quadriceps Muscle
Resistance Training
Knee
Exercise
Muscles
Isometric Contraction
Knee Joint

Citer dette

Jakobsen, M. D., Sundstrup, E., Andersen, C. H., Bandholm, T., Thorborg, K., Zebis, M. K., & Andersen, L. L. (2012). Muscle activity during knee-extension strengthening exercise performed with elastic tubing and isotonic resistance. International Journal of Sports Physical Therapy, 7(6), 606–616.
Jakobsen, Markus Due ; Sundstrup, Emil ; Andersen, Christoffer H ; Bandholm, Thomas ; Thorborg, Kristian ; Zebis, Mette K ; Andersen, Lars L. / Muscle activity during knee-extension strengthening exercise performed with elastic tubing and isotonic resistance. I: International Journal of Sports Physical Therapy. 2012 ; Bind 7, Nr. 6. s. 606–616.
@article{5015e1bb633a46feb50d0f6f8ae31f31,
title = "Muscle activity during knee-extension strengthening exercise performed with elastic tubing and isotonic resistance",
abstract = "BACKGROUND/PURPOSE: While elastic resistance training, targeting the upper body is effective for strength training, the effect of elastic resistance training on lower body muscle activity remains questionable. The purpose of this study was to evaluate the EMG-angle relationship of the quadriceps muscle during 10-RM knee-extensions performed with elastic tubing and an isotonic strength training machine.METHODS: 7 women and 9 men aged 28-67 years (mean age 44 and 41 years, respectively) participated. Electromyographic (EMG) activity was recorded in 10 muscles during the concentric and eccentric contraction phase of a knee extension exercise performed with elastic tubing and in training machine and normalized to maximal voluntary isometric contraction (MVC) EMG (nEMG). Knee joint angle was measured during the exercises using electronic inclinometers (range of motion 0-90°).RESULTS: When comparing the machine and elastic resistance exercises there were no significant differences in peak EMG of the rectus femoris (RF), vastus lateralis (VL), vastus medialis (VM) during the concentric contraction phase. However, during the eccentric phase, peak EMG was significantly higher (p<0.01) in RF and VM when performing knee extensions using the training machine. In VL and VM the EMG-angle pattern was different between the two training modalities (significant angle by exercise interaction). When using elastic resistance, the EMG-angle pattern peaked towards full knee extension (0°), whereas angle at peak EMG occurred closer to knee flexion position (90°) during the machine exercise. Perceived loading (Borg CR10) was similar during knee extensions performed with elastic tubing (5.7±0.6) compared with knee extensions performed in training machine (5.9±0.5).CONCLUSION: Knee extensions performed with elastic tubing induces similar high (>70{\%} nEMG) quadriceps muscle activity during the concentric contraction phase, but slightly lower during the eccentric contraction phase, as knee extensions performed using an isotonic training machine. During the concentric contraction phase the two different conditions displayed reciprocal EMG-angle patterns during the range of motion.LEVEL OF EVIDENCE: 5.",
author = "Jakobsen, {Markus Due} and Emil Sundstrup and Andersen, {Christoffer H} and Thomas Bandholm and Kristian Thorborg and Zebis, {Mette K} and Andersen, {Lars L}",
year = "2012",
language = "English",
volume = "7",
pages = "606–616",
journal = "International Journal of Sports Physical Therapy",
issn = "2159-2896",
publisher = "International Federation of Sports Physical Therapy (IFSPT)",
number = "6",

}

Jakobsen, MD, Sundstrup, E, Andersen, CH, Bandholm, T, Thorborg, K, Zebis, MK & Andersen, LL 2012, 'Muscle activity during knee-extension strengthening exercise performed with elastic tubing and isotonic resistance', International Journal of Sports Physical Therapy, bind 7, nr. 6, s. 606–616.

Muscle activity during knee-extension strengthening exercise performed with elastic tubing and isotonic resistance. / Jakobsen, Markus Due; Sundstrup, Emil; Andersen, Christoffer H; Bandholm, Thomas; Thorborg, Kristian; Zebis, Mette K; Andersen, Lars L.

I: International Journal of Sports Physical Therapy, Bind 7, Nr. 6, 2012, s. 606–616.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Muscle activity during knee-extension strengthening exercise performed with elastic tubing and isotonic resistance

AU - Jakobsen, Markus Due

AU - Sundstrup, Emil

AU - Andersen, Christoffer H

AU - Bandholm, Thomas

AU - Thorborg, Kristian

AU - Zebis, Mette K

AU - Andersen, Lars L

PY - 2012

Y1 - 2012

N2 - BACKGROUND/PURPOSE: While elastic resistance training, targeting the upper body is effective for strength training, the effect of elastic resistance training on lower body muscle activity remains questionable. The purpose of this study was to evaluate the EMG-angle relationship of the quadriceps muscle during 10-RM knee-extensions performed with elastic tubing and an isotonic strength training machine.METHODS: 7 women and 9 men aged 28-67 years (mean age 44 and 41 years, respectively) participated. Electromyographic (EMG) activity was recorded in 10 muscles during the concentric and eccentric contraction phase of a knee extension exercise performed with elastic tubing and in training machine and normalized to maximal voluntary isometric contraction (MVC) EMG (nEMG). Knee joint angle was measured during the exercises using electronic inclinometers (range of motion 0-90°).RESULTS: When comparing the machine and elastic resistance exercises there were no significant differences in peak EMG of the rectus femoris (RF), vastus lateralis (VL), vastus medialis (VM) during the concentric contraction phase. However, during the eccentric phase, peak EMG was significantly higher (p<0.01) in RF and VM when performing knee extensions using the training machine. In VL and VM the EMG-angle pattern was different between the two training modalities (significant angle by exercise interaction). When using elastic resistance, the EMG-angle pattern peaked towards full knee extension (0°), whereas angle at peak EMG occurred closer to knee flexion position (90°) during the machine exercise. Perceived loading (Borg CR10) was similar during knee extensions performed with elastic tubing (5.7±0.6) compared with knee extensions performed in training machine (5.9±0.5).CONCLUSION: Knee extensions performed with elastic tubing induces similar high (>70% nEMG) quadriceps muscle activity during the concentric contraction phase, but slightly lower during the eccentric contraction phase, as knee extensions performed using an isotonic training machine. During the concentric contraction phase the two different conditions displayed reciprocal EMG-angle patterns during the range of motion.LEVEL OF EVIDENCE: 5.

AB - BACKGROUND/PURPOSE: While elastic resistance training, targeting the upper body is effective for strength training, the effect of elastic resistance training on lower body muscle activity remains questionable. The purpose of this study was to evaluate the EMG-angle relationship of the quadriceps muscle during 10-RM knee-extensions performed with elastic tubing and an isotonic strength training machine.METHODS: 7 women and 9 men aged 28-67 years (mean age 44 and 41 years, respectively) participated. Electromyographic (EMG) activity was recorded in 10 muscles during the concentric and eccentric contraction phase of a knee extension exercise performed with elastic tubing and in training machine and normalized to maximal voluntary isometric contraction (MVC) EMG (nEMG). Knee joint angle was measured during the exercises using electronic inclinometers (range of motion 0-90°).RESULTS: When comparing the machine and elastic resistance exercises there were no significant differences in peak EMG of the rectus femoris (RF), vastus lateralis (VL), vastus medialis (VM) during the concentric contraction phase. However, during the eccentric phase, peak EMG was significantly higher (p<0.01) in RF and VM when performing knee extensions using the training machine. In VL and VM the EMG-angle pattern was different between the two training modalities (significant angle by exercise interaction). When using elastic resistance, the EMG-angle pattern peaked towards full knee extension (0°), whereas angle at peak EMG occurred closer to knee flexion position (90°) during the machine exercise. Perceived loading (Borg CR10) was similar during knee extensions performed with elastic tubing (5.7±0.6) compared with knee extensions performed in training machine (5.9±0.5).CONCLUSION: Knee extensions performed with elastic tubing induces similar high (>70% nEMG) quadriceps muscle activity during the concentric contraction phase, but slightly lower during the eccentric contraction phase, as knee extensions performed using an isotonic training machine. During the concentric contraction phase the two different conditions displayed reciprocal EMG-angle patterns during the range of motion.LEVEL OF EVIDENCE: 5.

M3 - Journal article

VL - 7

SP - 606

EP - 616

JO - International Journal of Sports Physical Therapy

JF - International Journal of Sports Physical Therapy

SN - 2159-2896

IS - 6

ER -