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Acute Effects of Eccentric Overload on Concentric Front Squat Performance.
J Strength Cond Res. 2017 May; 31(5):1192-1197.JS

Abstract

Munger, CN, Archer, DC, Leyva, WD, Wong, MA, Coburn, JW, Costa, PB, and Brown, LE. Acute effects of eccentric overload on concentric front squat performance. J Strength Cond Res 31(5): 1192-1197, 2017-Eccentric overload is used to enhance performance. The purpose of this study was to investigate the acute effects of eccentric overload on concentric front squat performance. Twenty resistance-trained men (age = 23.80 ± 1.82 years, height = 176.95 ± 5.21 cm, mass = 83.49 ± 10.43 kg, 1 repetition maximum [1RM] front squat = 131.02 ± 21.32 kg) volunteered. A dynamic warm-up and warm-up sets of front squat were performed. Eccentric hooks were added to the barbell. They descended for 3 seconds, until eccentric hooks released, and performed the concentric phase as fast as possible. There were 3 randomly ordered conditions with the concentric phase always at 90% 1RM and the eccentric phase at 105, 110, and 120% of 1RM. Two repetitions were performed for each condition. A repeated measures analysis of variance was used to determine differences. For peak velocity, there were main effects for time and condition (p < 0.05), where post (1.01 ± 0.10 m·s) was greater than pre (0.96 ± 0.11 m·s) and 120% (1.03 ± 1.11 m·s) was greater than 105% (0.99 ± 0.13 m·s). For peak power, there was a main effect for condition where 120% (2,225.00 ± 432.37 W) was greater than 105% (2,021.84 ± 563.53 W). For peak ground reaction force, there were main effects for time and condition, where post was greater than pre and 120% was greater than 105%. For the rate of force development, there was no interaction or main effects. Eccentric overload enhanced concentric velocity and power; therefore, it can be used by strength coaches and athletes during the power phase of a training program. It can also be used to prescribe supramaximal loads and could be a tool to supplement the clean exercise because the front squat is a precursor.

Authors+Show Affiliations

Department of Kinesiology, Human Performance Laboratory, Center for Sport Performance, California State University, Fullerton, California.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28151781

Citation

Munger, Cameron N., et al. "Acute Effects of Eccentric Overload On Concentric Front Squat Performance." Journal of Strength and Conditioning Research, vol. 31, no. 5, 2017, pp. 1192-1197.
Munger CN, Archer DC, Leyva WD, et al. Acute Effects of Eccentric Overload on Concentric Front Squat Performance. J Strength Cond Res. 2017;31(5):1192-1197.
Munger, C. N., Archer, D. C., Leyva, W. D., Wong, M. A., Coburn, J. W., Costa, P. B., & Brown, L. E. (2017). Acute Effects of Eccentric Overload on Concentric Front Squat Performance. Journal of Strength and Conditioning Research, 31(5), 1192-1197. https://doi.org/10.1519/JSC.0000000000001825
Munger CN, et al. Acute Effects of Eccentric Overload On Concentric Front Squat Performance. J Strength Cond Res. 2017;31(5):1192-1197. PubMed PMID: 28151781.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Acute Effects of Eccentric Overload on Concentric Front Squat Performance. AU - Munger,Cameron N, AU - Archer,David C, AU - Leyva,Whitney D, AU - Wong,Megan A, AU - Coburn,Jared W, AU - Costa,Pablo B, AU - Brown,Lee E, PY - 2017/2/6/pubmed PY - 2017/6/16/medline PY - 2017/2/3/entrez SP - 1192 EP - 1197 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 31 IS - 5 N2 - Munger, CN, Archer, DC, Leyva, WD, Wong, MA, Coburn, JW, Costa, PB, and Brown, LE. Acute effects of eccentric overload on concentric front squat performance. J Strength Cond Res 31(5): 1192-1197, 2017-Eccentric overload is used to enhance performance. The purpose of this study was to investigate the acute effects of eccentric overload on concentric front squat performance. Twenty resistance-trained men (age = 23.80 ± 1.82 years, height = 176.95 ± 5.21 cm, mass = 83.49 ± 10.43 kg, 1 repetition maximum [1RM] front squat = 131.02 ± 21.32 kg) volunteered. A dynamic warm-up and warm-up sets of front squat were performed. Eccentric hooks were added to the barbell. They descended for 3 seconds, until eccentric hooks released, and performed the concentric phase as fast as possible. There were 3 randomly ordered conditions with the concentric phase always at 90% 1RM and the eccentric phase at 105, 110, and 120% of 1RM. Two repetitions were performed for each condition. A repeated measures analysis of variance was used to determine differences. For peak velocity, there were main effects for time and condition (p < 0.05), where post (1.01 ± 0.10 m·s) was greater than pre (0.96 ± 0.11 m·s) and 120% (1.03 ± 1.11 m·s) was greater than 105% (0.99 ± 0.13 m·s). For peak power, there was a main effect for condition where 120% (2,225.00 ± 432.37 W) was greater than 105% (2,021.84 ± 563.53 W). For peak ground reaction force, there were main effects for time and condition, where post was greater than pre and 120% was greater than 105%. For the rate of force development, there was no interaction or main effects. Eccentric overload enhanced concentric velocity and power; therefore, it can be used by strength coaches and athletes during the power phase of a training program. It can also be used to prescribe supramaximal loads and could be a tool to supplement the clean exercise because the front squat is a precursor. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/28151781/Acute_Effects_of_Eccentric_Overload_on_Concentric_Front_Squat_Performance_ L2 - https://doi.org/10.1519/JSC.0000000000001825 DB - PRIME DP - Unbound Medicine ER -