J Athl Train. 2006 Jan-Mar;41(1):79-86.
Reduced quadriceps activation after lumbar paraspinal fatiguing exercise.
Journal of athletic training
Joseph M Hart, Julie M Fritz, D Casey Kerrigan, Ethan N Saliba, Bruce M Gansneder, Christopher D Ingersoll
PMID: 16619099
PMCID: PMC1421484
Abstract
CONTEXT: Although poor paraspinal muscle endurance has been associated with less quadriceps activation (QA) in persons with a history of low back pain, no authors have addressed the acute neuromuscular response after lumbar paraspinal fatiguing exercise.
OBJECTIVE: To compare QA after lumbar paraspinal fatiguing exercise in healthy individuals and those with a history of low back pain.
DESIGN: A 2 x 4 repeated-measures, time-series design.
SETTING: Exercise and Sport Injury Laboratory.
PATIENTS OR OTHER PARTICIPANTS: Sixteen volunteers participated (9 males, 7 females; 8 controls and 8 with a history of low back pain; age = 24.1 +/- 3.1 years, height = 173.4 +/- 7.1 cm, mass = 72.4 +/- 12.1 kg).
INTERVENTION(S): Subjects performed 3 sets of isometric lumbar paraspinal fatiguing muscle contractions. Exercise sets continued until the desired shift in lumbar paraspinal electromyographic median power frequency was observed. Baseline QA was compared with QA after each exercise set.
MAIN OUTCOME MEASURE(S): An electric burst was superimposed while subjects performed a maximal quadriceps contraction. We used the central activation ratio to calculate QA = (F(MVIC)/[F(MVIC) + F(Burst)])* 100, where F = force and MVIC = maximal voluntary isometric contractions. Quadriceps electromyographic activity was collected at the same time as QA measurements to permit calculation of median frequency during MVIC.
RESULTS: Average QA decreased from baseline (87.4% +/- 8.2%) after the first (84.5% +/- 10.5%), second (81.4% +/- 11.0%), and third (78.2% +/- 12.7%) fatiguing exercise sets. On average, the group with a history of low back pain showed significantly more QA than controls. No significant change in quadriceps median frequency was noted during the quadriceps MVICs.
CONCLUSIONS: The quadriceps muscle group was inhibited after lumbar paraspinal fatiguing exercise in the absence of quadriceps fatigue. This effect may be different for people with a history of low back pain compared with healthy controls.
References
- Neurosci Lett. 2004 Aug 5;366(1):76-9 - PubMed
- J Electromyogr Kinesiol. 2005 Feb;15(1):102-10 - PubMed
- Br J Sports Med. 2004 Feb;38(1):26-30 - PubMed
- Physiol Rev. 2001 Oct;81(4):1725-89 - PubMed
- Spine (Phila Pa 1976). 2003 Aug 15;28(16):1810-20 - PubMed
- J Athl Train. 1999 Apr;34(2):137-43 - PubMed
- Clin J Sport Med. 1997 Jan;7(1):22-7 - PubMed
- J Orthop Res. 2003 Sep;21(5):775-9 - PubMed
- Phys Ther. 1997 Feb;77(2):132-42; discussion 142-4 - PubMed
- Spine (Phila Pa 1976). 2001 Aug 15;26(16):E361-6 - PubMed
- J Orthop Sports Phys Ther. 1997 Mar;25(3):171-84 - PubMed
- J Electromyogr Kinesiol. 2003 Feb;13(1):83-92 - PubMed
- Spine (Phila Pa 1976). 1993 Mar 1;18(3):364-7 - PubMed
- J Electromyogr Kinesiol. 2004 Dec;14(6):631-40 - PubMed
- Clin Biomech (Bristol, Avon). 1999 Feb;14(2):103-11 - PubMed
- Eur J Appl Physiol Occup Physiol. 1999 Jun;80(1):57-63 - PubMed
- J Manipulative Physiol Ther. 2000 Feb;23(2):76-80 - PubMed
- J Electromyogr Kinesiol. 2004 Jun;14(3):287-94 - PubMed
- J Appl Physiol (1985). 2004 Jan;96(1):218-25 - PubMed
- Phys Ther. 2003 Apr;83(4):359-65 - PubMed
- Phys Ther. 2000 Mar;80(3):251-60 - PubMed
- Eur J Appl Physiol. 2003 Nov;90(5-6):562-8 - PubMed
- Clin Biomech (Bristol, Avon). 2003 Nov;18(9):843-7 - PubMed
- Clin Biomech (Bristol, Avon). 2000 Mar;15(3):147-59 - PubMed
- Clin Biomech (Bristol, Avon). 2004 Feb;19(2):136-44 - PubMed
- J Manipulative Physiol Ther. 1999 Mar-Apr;22(3):149-53 - PubMed
- Eur J Appl Physiol. 2002 Aug;87(4-5):462-8 - PubMed
- Spine (Phila Pa 1976). 1999 Jul 1;24(13):1322-7 - PubMed
- Arch Phys Med Rehabil. 1998 Apr;79(4):412-7 - PubMed
- Med Sci Sports Exerc. 2004 Aug;36(8):1403-12 - PubMed
- Med Sci Sports Exerc. 2002 Aug;34(8):1316-23 - PubMed
- J Electromyogr Kinesiol. 2003 Oct;13(5):491-8 - PubMed
- Knee Surg Sports Traumatol Arthrosc. 1997;5(3):162-7 - PubMed
- Scand J Med Sci Sports. 2004 Aug;14(4):221-30 - PubMed
- Med Sci Sports Exerc. 2004 Jun;36(6):926-34 - PubMed
- Clin Biomech (Bristol, Avon). 2002 Feb;17(2):99-105 - PubMed
Publication Types