The Effect of Rest Redistribution on Kinetic and Kinematic Variables During the Countermovement Shrug.

Meechan, David; McMahon, John J; Suchomel, Timothy J; Comfort, Paul

Abstract

This study compared the effects of rest redistribution (RR) on kinetic and kinematic variables during the countermovement shrug (CMS). Twenty-one male subjects (age 27.2 ± 3.3. years, height 1.78 ± 0.07 m, body mass 77.2 ±10.6 kg, relative one repetition maximum (1RM) power clean [PC] 1.22 ± 0.16 kg.kg -1 ) performed the CMS using 140% of 1RM PC with 3 traditional sets of 6 repetitions (TS), 9 sets of 2 repetitions with RR [45s rest after 2 repetitions] (RR 45 ) and 6 sets of 3 repetitions with RR [72s rest after 3 repetitions] (RR 72 ). There were no significant or meaningful differences (p > 0.05, g = 0.00-0.15) between set configurations for any variables for the average of the 18 repetitions. There were no significant (p > 0.05) or meaningful (
g = 0.00-0.14) differences for configuration and configuration x set for peak (PF) and mean force (MF), peak velocity (PV), impulse, phase duration, peak velocity decline, peak velocity maintenance and RPE. There was significantly greater (p = 0.034) albeit
small ( g = 0.15) difference for mean velocity (MV) during TS compared to RR 72. There were no significant or meaningful differences (p > 0.05, g = 0.00-0.09) between sets for PF, MF, PV, MV, impulse, and duration across TS, RR 45 and RR 72. Rest redistribution protocols did not result in greater kinetics or kinematics during the CMS compared to TS, when total rest time was equated. Thus, shorter more frequent rest periods during the CMS may not be required to maintain force-time characteristics.

Citation

Meechan, D., McMahon, J. J., Suchomel, T. J., & Comfort, P. (in press). The Effect of Rest Redistribution on Kinetic and Kinematic Variables During the Countermovement Shrug. Journal of Strength and Conditioning Research, 37(7), 1358-1366. https://doi.org/10.1519/JSC.0000000000004238

• Journal Article Type: Article
• Acceptance Date: Mar 23, 2022
• Online Publication Date: Nov 30, 2022
• Deposit Date: Aug 23, 2022
• Journal: Journal of strength and conditioning research
• Print ISSN: 1064-8011
• Electronic ISSN: 1533-4287
• Publisher: Lippincott, Williams & Wilkins
• Volume: 37
• Issue: 7
• Pages: 1358-1366
• DOI: https://doi.org/10.1519/JSC.0000000000004238
• Keywords: Weight Lifting, Biomechanical Phenomena, Male, Muscle, Skeletal, Humans, Rest, Resistance Training - methods, Young Adult, Adult, Muscle Strength, Kinetics
• Publisher URL: https://journals.lww.com/nsca-jscr/pages/default.aspx