Cycling Performance Enhancement After Drop Jumps May Be Attributed to Postactivation Potentiation and Increased Anaerobic Capacity. Issue 9 (September 2020)

• Record Type: Journal Article
• Authors: de Poli, Rodrigo A.B.; Boullosa, Daniel A.; Malta, Elvis S.; Behm, David; Lopes, Vithor H.F.; Barbieri, Fabio A.; Zagatto, Alessandro M.
• Is Part Of: Journal of strength and conditioning research. Volume 34:Issue 9(2020)
• Publication Date: 2020-09
• Subjects: fatigue -- glycolytic pathway -- twitch interpolation technique -- warm-up -- electromyography -- plyometric; Physical education and training -- Periodicals; Weight training -- Physiological aspects -- Periodicals; Physical fitness -- Periodicals; 613.7
• DOI: 10.1519/JSC.0000000000003399
• Languages: English
• ISSNs: 1064-8011

Abstract

Abstract : Abstract: de Poli, RAB, Boullosa, DA, Malta, ES, Behm, D, Lopes, VHF, Barbieri, FA, and Zagatto, AM. Cycling performance enhancement after drop jumps may be attributed to postactivation potentiation and increased anaerobic capacity. J Strength Cond Res 34(9): 2465–2475, 2020—The study aimed to investigate the effects of drop jumps (DJs) on supramaximal cycling performance, anaerobic capacity (AC), electromyography, and fatigue. Thirty-eight recreational cyclists participated into 3 independent studies. In study 1 ( n = 14), neuromuscular fatigue was assessed with the twitch interpolation technique. In study 2 ( n = 16), the AC and metabolic contributions were measured with the maximal accumulated oxygen deficit method and the sum of the glycolytic and phosphagen pathways. In study 3 ( n = 8), postactivation potentiation (PAP) induced by repeated DJs was evaluated. The DJ protocol was effective for significantly improving cycling performance by +9.8 and +7.4% in studies 1 and 2, respectively ( p ⩽ 0.05). No differences were observed in electromyography between conditions ( p = 0.70); however, the force evoked by a doublet at low (10 Hz) and high frequencies (100 Hz) declined for control (−16.4 and −23.9%) and DJ protocols (−18.6 and −26.9%) ( p < 0.01). Force decline was greater in the DJ condition ( p < 0.03). Anaerobic capacity and glycolytic pathway contributions were +7.7 and +9.1% higher after DJ protocol ( p = 0.01). Peak force during maximal voluntary contraction (+5.6%) and doublet evoked force at 100 Hz (+5.0%) were higher after DJs. The DJ protocol induced PAP, improved supramaximal cycling performance, and increased AC despite higher peripheral fatigue.