Ischemic Preconditioning and Repeated Sprint Swimming: A Placebo and Nocebo Study

Ischemic Preconditioning and Repeated Sprint Swimming: A Placebo and Nocebo Study

Author Ferreira, Thiago Henrique Nunes Autor UNIFESP Google Scholar
Sabino-Carvalho, Jeann Lúccas de Castro Autor UNIFESP Google Scholar
Lopes, Thiago Ribeiro Autor UNIFESP Google Scholar
Ribeiro, Indyanara C. Google Scholar
Succi, José Ernesto Autor UNIFESP Google Scholar
Silva, Antonio Carlos da Autor UNIFESP Google Scholar
Silva, Bruno Moreira Autor UNIFESP Google Scholar
Abstract Purpose Ischemic preconditioning (IPC) has been shown to improve performance of exercises lasting 10-90 s (anaerobic) and more than 90 s (aerobic). However, its effect on repeated sprint performance has been controversial, placebo effect has not been adequately controlled, and nocebo effect has not been avoided. Thus, the IPC effect on repeated sprint performance was investigated using a swimming task and controlling placebo/nocebo effects. Methods Short-distance university swimmers were randomized to two groups. One group (n = 15, 24 1 yr [mean SEM]) was exposed to IPC (ischemia cycles lasted 5 min) and control (CT) (no ischemia)

another (n = 15, 24 +/- 1 yr) to a placebo intervention (SHAM) (ischemia cycles lasted 1 min) and CT. Seven subjects crossed over groups. Subjects were informed IPC and SHAM would improve performance compared with CT and would be harmless despite circulatory occlusion sensations. The swimming task consisted of six 50-m all-out efforts repeated every 3 min. Results IPC, in contrast with SHAM, reduced worst sprint time (IPC, 35.21 +/- 0.73 vs CT, 36.53 +/- 0.72 s

P = 0.04) and total sprints time (IPC, 203.7 +/- 4.60 vs CT, 206.03 +/- 4.57 s

P = 0.02), moreover augmented swimming velocity (IPC, 1.45 +/- 0.03 vs CT, 1.44 +/- 0.03 ms(-1)

P = 0.049). Six of seven subjects who crossed over groups reduced total sprints time with IPC versus SHAM (delta = -3.95 +/- 1.49 s, P = 0.09). Both IPC and SHAM did not change blood lactate concentration (P = 0.20) and perceived effort (P = 0.22). Conclusion IPC enhanced repeated sprint swimming performance in university swimmers, whereas a placebo intervention did not.
xmlui.dri2xhtml.METS-1.0.item-coverage Philadelphia
Language English
Sponsor Sao Paulo Research Foundation (FAPESP) [14/15877-8]
FAPESP [15/03186-3]
Date 2016
Published in Medicine And Science In Sports And Exercise. Philadelphia, v. 48, n. 10, p. 1967-1975, 2016.
ISSN 0195-9131 (Sherpa/Romeo, impact factor)
Publisher Lippincott Williams & Wilkins
Extent 1967-1975
Access rights Closed access
Type Article
Web of Science ID WOS:000384298800014

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