Reliability of leg muscle electromyography in vertical jumping

Peter C. Goodwin, Kobus Koorts, Richard Mack, Shunfu Mai, Matthew C. Morrissey, David M. Hooper

Research output: Contribution to journalJournal Article

24 Citations (Scopus)

Abstract

Abstract: In this study we aimed to determine the reliability of the surface electromyography (EMG) of leg muscles during vertical jumping between two test sessions, held 2 weeks apart. Fifteen females performed three maximal vertical jumps with countermovement. The displacement of the body centre of mass (BCM), duration of propulsion phase (time), range of motion (ROM) and angular velocity of the knee and surface EMG of four leg muscles (rectus femoris, vastus medialis. biceps femoris and gastrocnemius) were recorded during the jumps. All variables were analysed throughout the propulsion and mid-propulsion phases. Intraclass correlation coefficients (ICC) for the rectus femoris, vastus medialis, biceps femoris and gastrocnemius were calculated to be 0.88, 0.70, 0.24 and 0.01, respectively. BCM, ROM and time values all indicated ICC values greater than 0.90, and the mean knee angular velocity was slightly lower, at 0.75. ICCs between displacement of the BCM and integrated EMG (IEMG) of the muscles studied were less than 0.50. The angular velocity of the knee did not correlate well with muscle activity. Factors that may have affected reliability were variations in the position of electrode replacement, skin resistance, cross-talk between muscles and jump mechanics. The results of this study suggest that while kinematic variables are reproducible over successive vertical jumps, the degree of repeatability of an IEMG signal is dependent upon the muscle studied.
Original languageEnglish
Pages (from-to)374-8
Number of pages5
JournalEuropean Journal of Applied Physiology
Volume79
Issue number4
Publication statusPublished - Apr 1999
Externally publishedYes

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Electromyography
Leg
Quadriceps Muscle
Muscles
Knee
Articular Range of Motion
Mechanics
Biomechanical Phenomena
Electrodes
Skin

Cite this

Goodwin, P. C., Koorts, K., Mack, R., Mai, S., Morrissey, M. C., & Hooper, D. M. (1999). Reliability of leg muscle electromyography in vertical jumping. European Journal of Applied Physiology, 79(4), 374-8.
Goodwin, Peter C. ; Koorts, Kobus ; Mack, Richard ; Mai, Shunfu ; Morrissey, Matthew C. ; Hooper, David M. / Reliability of leg muscle electromyography in vertical jumping. In: European Journal of Applied Physiology. 1999 ; Vol. 79, No. 4. pp. 374-8.
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Goodwin, PC, Koorts, K, Mack, R, Mai, S, Morrissey, MC & Hooper, DM 1999, 'Reliability of leg muscle electromyography in vertical jumping', European Journal of Applied Physiology, vol. 79, no. 4, pp. 374-8.

Reliability of leg muscle electromyography in vertical jumping. / Goodwin, Peter C.; Koorts, Kobus; Mack, Richard; Mai, Shunfu; Morrissey, Matthew C.; Hooper, David M.

In: European Journal of Applied Physiology, Vol. 79, No. 4, 04.1999, p. 374-8.

Research output: Contribution to journalJournal Article

TY - JOUR

T1 - Reliability of leg muscle electromyography in vertical jumping

AU - Goodwin, Peter C.

AU - Koorts, Kobus

AU - Mack, Richard

AU - Mai, Shunfu

AU - Morrissey, Matthew C.

AU - Hooper, David M.

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N2 - Abstract: In this study we aimed to determine the reliability of the surface electromyography (EMG) of leg muscles during vertical jumping between two test sessions, held 2 weeks apart. Fifteen females performed three maximal vertical jumps with countermovement. The displacement of the body centre of mass (BCM), duration of propulsion phase (time), range of motion (ROM) and angular velocity of the knee and surface EMG of four leg muscles (rectus femoris, vastus medialis. biceps femoris and gastrocnemius) were recorded during the jumps. All variables were analysed throughout the propulsion and mid-propulsion phases. Intraclass correlation coefficients (ICC) for the rectus femoris, vastus medialis, biceps femoris and gastrocnemius were calculated to be 0.88, 0.70, 0.24 and 0.01, respectively. BCM, ROM and time values all indicated ICC values greater than 0.90, and the mean knee angular velocity was slightly lower, at 0.75. ICCs between displacement of the BCM and integrated EMG (IEMG) of the muscles studied were less than 0.50. The angular velocity of the knee did not correlate well with muscle activity. Factors that may have affected reliability were variations in the position of electrode replacement, skin resistance, cross-talk between muscles and jump mechanics. The results of this study suggest that while kinematic variables are reproducible over successive vertical jumps, the degree of repeatability of an IEMG signal is dependent upon the muscle studied.

AB - Abstract: In this study we aimed to determine the reliability of the surface electromyography (EMG) of leg muscles during vertical jumping between two test sessions, held 2 weeks apart. Fifteen females performed three maximal vertical jumps with countermovement. The displacement of the body centre of mass (BCM), duration of propulsion phase (time), range of motion (ROM) and angular velocity of the knee and surface EMG of four leg muscles (rectus femoris, vastus medialis. biceps femoris and gastrocnemius) were recorded during the jumps. All variables were analysed throughout the propulsion and mid-propulsion phases. Intraclass correlation coefficients (ICC) for the rectus femoris, vastus medialis, biceps femoris and gastrocnemius were calculated to be 0.88, 0.70, 0.24 and 0.01, respectively. BCM, ROM and time values all indicated ICC values greater than 0.90, and the mean knee angular velocity was slightly lower, at 0.75. ICCs between displacement of the BCM and integrated EMG (IEMG) of the muscles studied were less than 0.50. The angular velocity of the knee did not correlate well with muscle activity. Factors that may have affected reliability were variations in the position of electrode replacement, skin resistance, cross-talk between muscles and jump mechanics. The results of this study suggest that while kinematic variables are reproducible over successive vertical jumps, the degree of repeatability of an IEMG signal is dependent upon the muscle studied.

M3 - Journal Article

VL - 79

SP - 374

EP - 378

JO - European Journal of Applied Physiology

JF - European Journal of Applied Physiology

SN - 1439-6319

IS - 4

ER -

Goodwin PC, Koorts K, Mack R, Mai S, Morrissey MC, Hooper DM. Reliability of leg muscle electromyography in vertical jumping. European Journal of Applied Physiology. 1999 Apr;79(4):374-8.