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Effects of two neuromuscular fatigue protocols on landing performance.
J Electromyogr Kinesiol. 2010 Aug; 20(4):667-75.JE

Abstract

The purpose of the study was to investigate the effects of two fatigue protocols on landing performance. A repeated measures design was used to examine the effects of fatigue and fatigue protocol on neuromuscular and biomechanical performance variables. Ten volunteers performed non-fatigued and fatigued landings on two days using different fatigue protocols. Repeated maximum isometric squats were used to induce fatigue on day one. Sub-maximum cycling was used to induce fatigue on day two. Isometric squat maximum voluntary contraction (MVC) was measured before and after fatigued landings on each day. During the landings, ground reaction force (GRF), knee kinematics, and electromyographic (EMG) data were recorded. Isometric MVC, GRF peaks, loading rates, impulse, knee flexion at contact, range of motion, max angular velocity, and EMG root mean square (RMS) values were compared pre- and post-fatiguing exercise and between fatigue protocols using repeated ANOVA. Fatigue decreased MVC strength (p0.05), GRF second peak, and initial impulse (p0.01), but increased quadriceps medium latency stretch reflex EMG activity (p0.012). Knee flexion at contact was 5.2 degrees greater (p0.05) during fatigued landings following the squat exercise compared to cycling. Several variables exhibited non-significant but large effect sizes when comparing the effects of fatigue and fatigue protocol. In conclusion, fatigue alters landing performance and different fatigue protocols result in different performance changes.

Authors+Show Affiliations

Center for Rehabilitation Research, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA. Roger.James@ttuhsc.eduNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

20006522

Citation

James, C Roger, et al. "Effects of Two Neuromuscular Fatigue Protocols On Landing Performance." Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, vol. 20, no. 4, 2010, pp. 667-75.
James CR, Scheuermann BW, Smith MP. Effects of two neuromuscular fatigue protocols on landing performance. J Electromyogr Kinesiol. 2010;20(4):667-75.
James, C. R., Scheuermann, B. W., & Smith, M. P. (2010). Effects of two neuromuscular fatigue protocols on landing performance. Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, 20(4), 667-75. https://doi.org/10.1016/j.jelekin.2009.10.007
James CR, Scheuermann BW, Smith MP. Effects of Two Neuromuscular Fatigue Protocols On Landing Performance. J Electromyogr Kinesiol. 2010;20(4):667-75. PubMed PMID: 20006522.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of two neuromuscular fatigue protocols on landing performance. AU - James,C Roger, AU - Scheuermann,Barry W, AU - Smith,Michael P, Y1 - 2009/12/16/ PY - 2009/06/18/received PY - 2009/09/25/revised PY - 2009/10/16/accepted PY - 2009/12/17/entrez PY - 2009/12/17/pubmed PY - 2010/8/27/medline SP - 667 EP - 75 JF - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology JO - J Electromyogr Kinesiol VL - 20 IS - 4 N2 - The purpose of the study was to investigate the effects of two fatigue protocols on landing performance. A repeated measures design was used to examine the effects of fatigue and fatigue protocol on neuromuscular and biomechanical performance variables. Ten volunteers performed non-fatigued and fatigued landings on two days using different fatigue protocols. Repeated maximum isometric squats were used to induce fatigue on day one. Sub-maximum cycling was used to induce fatigue on day two. Isometric squat maximum voluntary contraction (MVC) was measured before and after fatigued landings on each day. During the landings, ground reaction force (GRF), knee kinematics, and electromyographic (EMG) data were recorded. Isometric MVC, GRF peaks, loading rates, impulse, knee flexion at contact, range of motion, max angular velocity, and EMG root mean square (RMS) values were compared pre- and post-fatiguing exercise and between fatigue protocols using repeated ANOVA. Fatigue decreased MVC strength (p0.05), GRF second peak, and initial impulse (p0.01), but increased quadriceps medium latency stretch reflex EMG activity (p0.012). Knee flexion at contact was 5.2 degrees greater (p0.05) during fatigued landings following the squat exercise compared to cycling. Several variables exhibited non-significant but large effect sizes when comparing the effects of fatigue and fatigue protocol. In conclusion, fatigue alters landing performance and different fatigue protocols result in different performance changes. SN - 1873-5711 UR - https://www.unboundmedicine.com/medline/citation/20006522/Effects_of_two_neuromuscular_fatigue_protocols_on_landing_performance_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1050-6411(09)00163-1 DB - PRIME DP - Unbound Medicine ER -