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Sports 2018, 6(3), 79; https://doi.org/10.3390/sports6030079

Force-Time Differences between Ballistic and Non-Ballistic Half-Squats

1
Department of Human Movement Sciences, Carroll University, Waukesha, WI 53186, USA
2
Department of Exercise Science, Sacred Heart University, Fairfield, CT 06825, USA
3
Department of Health and Human Performance, The Citadel—The Military College of South Carolina, Charleston, SC 29409, USA
4
Department of Exercise and Sport Sciences, Center of Excellence for Sport Science and Coach Education, East Tennessee State University, Johnson City, TN 37614, USA
*
Author to whom correspondence should be addressed.
Received: 18 July 2018 / Revised: 29 July 2018 / Accepted: 10 August 2018 / Published: 12 August 2018
(This article belongs to the Special Issue Advances in Neuromuscular Research)
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Abstract

The purpose of this study was to examine the force-time differences between concentric-only half-squats (COHS) performed with ballistic (BAL) or non-ballistic (NBAL) intent across a range of loads. Eighteen resistance-trained men performed either BAL or NBAL COHS at 30%, 50%, 70%, and 90% of their one repetition maximum (1RM) COHS. Relative peak force (PF) and relative impulse from 0–50 ms (Imp50), 0–90 ms (Imp90), 0–200 ms (Imp200), and 0–250 ms (Imp250) were compared using a series of 2 × 4 (intent × load) repeated measures ANOVAs with Bonferroni post hoc tests. Cohen’s d effect sizes were calculated to provide measures of practical significance between the BAL and NBAL COHS and each load. BAL COHS produced statistically greater PF than NBAL COHS at 30% (d = 3.37), 50% (d = 2.88), 70% (d = 2.29), and 90% 1RM (d = 1.19) (all p < 0.001). Statistically significant main effect differences were found between load-averaged BAL and NBAL COHS for Imp90 (p = 0.006, d = 0.25), Imp200 (p = 0.001, d = 0.36), and Imp250 (p < 0.001, d = 0.41), but not for Imp50 (p = 0.018, d = 0.21). Considering the greater PF and impulse observed during the BAL condition, performing COHS with BAL intent may provide a favorable training stimulus compared to COHS performed with NBAL intent. View Full-Text
Keywords: partial squat; intent; resistance training; strength partial squat; intent; resistance training; strength
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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MDPI and ACS Style

Suchomel, T.J.; Taber, C.B.; Sole, C.J.; Stone, M.H. Force-Time Differences between Ballistic and Non-Ballistic Half-Squats. Sports 2018, 6, 79.

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