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Effect of unilateral knee extensor fatigue on force and balance of the contralateral limb.
Eur J Appl Physiol. 2015 Oct; 115(10):2177-87.EJ

Abstract

PURPOSE

Fatigue in one limb can decrease force production in the homologous muscle as well as other muscles of the non-fatigued limb affecting balance. The objective of the study was to examine the effect of unilateral knee extensor fatigue on the non-fatigued limb's standing balance, muscle force and activation.

METHOD

Sixteen healthy male subjects performed pre-fatigue balance trials, warm-up exercises, maximum voluntary isometric contractions, a knee extensors fatigue protocol, and post-fatigue balance trials. The fatigue protocol consisted of sets of 15 consecutive isometric contractions of 16 s each with 4 s recovery between repetitions, which were performed at 30% peak force for the dominant knee extensor muscles. Additional sets of contractions continued until a 50% decrease in MVIC knee extensor force was observed. Pre- and post-fatigue balance assessment consisted of transition from double to single leg standing and also single leg standing trials, which were performed bilaterally and in randomized order.

RESULT

The peak force and F100 were significantly decreased by 44.8% (ES = 2.54) and 39.9% (ES = 0.59), respectively, for the fatigued limb post-fatigue. There were no significant changes in the non-fatigued limb's muscle force, activation, muscle onset timing or postural stability parameters.

CONCLUSION

While the lack of change in non-fatigued limb force production is in agreement with some of the previous literature in this area, the lack of effect on postural measures directly contradicts earlier work. It is hypothesized that discrepancies in the duration and the intensity of the fatigue protocol may have accounted for this discrepancy.

Authors+Show Affiliations

School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, NL, A1C 5S7, Canada.School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, NL, A1C 5S7, Canada.School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, NL, A1C 5S7, Canada.School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, NL, A1C 5S7, Canada. dbehm@mun.ca.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26047643

Citation

Arora, Shruti, et al. "Effect of Unilateral Knee Extensor Fatigue On Force and Balance of the Contralateral Limb." European Journal of Applied Physiology, vol. 115, no. 10, 2015, pp. 2177-87.
Arora S, Budden S, Byrne JM, et al. Effect of unilateral knee extensor fatigue on force and balance of the contralateral limb. Eur J Appl Physiol. 2015;115(10):2177-87.
Arora, S., Budden, S., Byrne, J. M., & Behm, D. G. (2015). Effect of unilateral knee extensor fatigue on force and balance of the contralateral limb. European Journal of Applied Physiology, 115(10), 2177-87. https://doi.org/10.1007/s00421-015-3198-5
Arora S, et al. Effect of Unilateral Knee Extensor Fatigue On Force and Balance of the Contralateral Limb. Eur J Appl Physiol. 2015;115(10):2177-87. PubMed PMID: 26047643.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of unilateral knee extensor fatigue on force and balance of the contralateral limb. AU - Arora,Shruti, AU - Budden,Shawn, AU - Byrne,Jeannette M, AU - Behm,David G, Y1 - 2015/06/06/ PY - 2015/01/27/received PY - 2015/05/29/accepted PY - 2015/6/7/entrez PY - 2015/6/7/pubmed PY - 2016/6/18/medline KW - Crossover fatigue KW - Electromyography KW - Equilibrium KW - Isometric KW - Stability KW - Strength SP - 2177 EP - 87 JF - European journal of applied physiology JO - Eur J Appl Physiol VL - 115 IS - 10 N2 - PURPOSE: Fatigue in one limb can decrease force production in the homologous muscle as well as other muscles of the non-fatigued limb affecting balance. The objective of the study was to examine the effect of unilateral knee extensor fatigue on the non-fatigued limb's standing balance, muscle force and activation. METHOD: Sixteen healthy male subjects performed pre-fatigue balance trials, warm-up exercises, maximum voluntary isometric contractions, a knee extensors fatigue protocol, and post-fatigue balance trials. The fatigue protocol consisted of sets of 15 consecutive isometric contractions of 16 s each with 4 s recovery between repetitions, which were performed at 30% peak force for the dominant knee extensor muscles. Additional sets of contractions continued until a 50% decrease in MVIC knee extensor force was observed. Pre- and post-fatigue balance assessment consisted of transition from double to single leg standing and also single leg standing trials, which were performed bilaterally and in randomized order. RESULT: The peak force and F100 were significantly decreased by 44.8% (ES = 2.54) and 39.9% (ES = 0.59), respectively, for the fatigued limb post-fatigue. There were no significant changes in the non-fatigued limb's muscle force, activation, muscle onset timing or postural stability parameters. CONCLUSION: While the lack of change in non-fatigued limb force production is in agreement with some of the previous literature in this area, the lack of effect on postural measures directly contradicts earlier work. It is hypothesized that discrepancies in the duration and the intensity of the fatigue protocol may have accounted for this discrepancy. SN - 1439-6327 UR - https://www.unboundmedicine.com/medline/citation/26047643/Effect_of_unilateral_knee_extensor_fatigue_on_force_and_balance_of_the_contralateral_limb_ L2 - https://dx.doi.org/10.1007/s00421-015-3198-5 DB - PRIME DP - Unbound Medicine ER -