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The effect of heavy- vs. light-load jump squats on the development of strength, power, and speed.
J Strength Cond Res. 2002 Feb; 16(1):75-82.JS

Abstract

The purpose of this investigation was to examine the effect of an 8-week training program with heavy- vs. light-load jump squats on various physical performance measures and electromyography (EMG). Twenty-six athletic men with varying levels of resistance training experience performed sessions of jump squats with either 30% (JS30, n = 9) or 80% (JS80, n = 10) of their one repetition maximum in the squat (1RM) or served as a control (C, n = 7). An agility test, 20-m sprint, and jump squats with 30% (30J), 55% (55J), and 80% (80J) of their 1RM were performed before and after training. Peak force, peak velocity (PV), peak power (PP), jump height, and average EMG (concentric phase) were calculated for the jumps. There were significant increases in PP and PV in the 30J, 55J, and 80J for the JS30 group (p <or= 0.05). The JS30 group also significantly increased in the 1RM with a trend towards improved 20-m sprint times. In contrast, the JS80 group significantly increased both PF and PP in the 55J and 80J and significantly increased in the 1RM but ran significantly slower in the 20-m sprint. In the 30J the JS30 group's percentage increase in EMG activity was significantly different from the C group. In the 80J the JS80 group's percentage increase in EMG activity was significantly different from the C group. This investigation indicates that training with light-load jump squats results in increased movement velocity capabilities and that velocity-specific changes in muscle activity may play a key role in this adaptation.

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Authors+Show Affiliations

McBride JM
Southern Cross University, School of Exercise Science and Sport Management, Lismore, NSW, Australia. mcbride.jeff@uwlax.edu.
Triplett-McBride T
No affiliation info available
Davie A
No affiliation info available
Newton RU
No affiliation info available

MeSH

Adaptation, PhysiologicalAdolescentAdultAnthropometryElectromyographyExerciseHumansLongitudinal StudiesMaleMuscle, SkeletalPhysical Education and TrainingRunningTask Performance and AnalysisThighTime FactorsWeight Lifting

Pub Type(s)

Clinical Trial
Comparative Study
Controlled Clinical Trial
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

11834109

Citation

McBride, Jeffrey M., et al. "The Effect of Heavy- Vs. Light-load Jump Squats On the Development of Strength, Power, and Speed." Journal of Strength and Conditioning Research, vol. 16, no. 1, 2002, pp. 75-82.
McBride JM, Triplett-McBride T, Davie A, et al. The effect of heavy- vs. light-load jump squats on the development of strength, power, and speed. J Strength Cond Res. 2002;16(1):75-82.
McBride, J. M., Triplett-McBride, T., Davie, A., & Newton, R. U. (2002). The effect of heavy- vs. light-load jump squats on the development of strength, power, and speed. Journal of Strength and Conditioning Research, 16(1), 75-82.
McBride JM, et al. The Effect of Heavy- Vs. Light-load Jump Squats On the Development of Strength, Power, and Speed. J Strength Cond Res. 2002;16(1):75-82. PubMed PMID: 11834109.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effect of heavy- vs. light-load jump squats on the development of strength, power, and speed. AU - McBride,Jeffrey M, AU - Triplett-McBride,Travis, AU - Davie,Allan, AU - Newton,Robert U, PY - 2002/2/9/pubmed PY - 2002/3/29/medline PY - 2002/2/9/entrez SP - 75 EP - 82 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 16 IS - 1 N2 - The purpose of this investigation was to examine the effect of an 8-week training program with heavy- vs. light-load jump squats on various physical performance measures and electromyography (EMG). Twenty-six athletic men with varying levels of resistance training experience performed sessions of jump squats with either 30% (JS30, n = 9) or 80% (JS80, n = 10) of their one repetition maximum in the squat (1RM) or served as a control (C, n = 7). An agility test, 20-m sprint, and jump squats with 30% (30J), 55% (55J), and 80% (80J) of their 1RM were performed before and after training. Peak force, peak velocity (PV), peak power (PP), jump height, and average EMG (concentric phase) were calculated for the jumps. There were significant increases in PP and PV in the 30J, 55J, and 80J for the JS30 group (p <or= 0.05). The JS30 group also significantly increased in the 1RM with a trend towards improved 20-m sprint times. In contrast, the JS80 group significantly increased both PF and PP in the 55J and 80J and significantly increased in the 1RM but ran significantly slower in the 20-m sprint. In the 30J the JS30 group's percentage increase in EMG activity was significantly different from the C group. In the 80J the JS80 group's percentage increase in EMG activity was significantly different from the C group. This investigation indicates that training with light-load jump squats results in increased movement velocity capabilities and that velocity-specific changes in muscle activity may play a key role in this adaptation. SN - 1064-8011 UR - https://www.unboundmedicine.com/medline/citation/11834109/The_effect_of_heavy__vs__light_load_jump_squats_on_the_development_of_strength_power_and_speed_ L2 - http://ovidsp.ovid.com/ovidweb.cgi?T=JS&amp;PAGE=linkout&amp;SEARCH=11834109.ui DB - PRIME DP - Unbound Medicine ER -