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Erschienen in:
05.04.2019 | Original Article
Impact of 8 weeks of repeated ischemic preconditioning on running performance
Erschienen in: European Journal of Applied Physiology | Ausgabe 6/2019
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Purpose
To examine if repeated exposure to IPC treatment prior to training sessions improves oxygen uptake and 1-km running performance in highly trained middle-distance runners.
Methods
Fourteen highly trained endurance runners (11 male/3 female, 19 ± 2 years, 64 ± 5 ml kg−1 min−1) completed a baseline maximal oxygen consumption (\(\dot{V}{\text{O}}_{{ 2 {\text{max}}}}\)) test and 1-km running performance test before random assignment to an IPC or control group. Both groups were prescribed identical endurance training over an 8-week varsity season; however, the IPC group performed an IPC protocol (5 min ischemia, repeated 3 times, each separated by 5 min reperfusion) before every training session. After 8 weeks of training, participants completed a follow-up \(\dot{V}{\text{O}}_{{ 2 {\text{max}}}}\) test and 1-km time trial.
Results
\(\dot{V}{\text{O}}_{{ 2 {\text{max}}}}\) did not increase from baseline in either group following the 8-week training bout (P = 0.2), and neither group varied more than the other (\(\Delta \dot{V}{\text{O}}_{{ 2 {\text{max}}}}\) = IPC 0.6 ± 2 ml kg−1 min−1; control 1.5 ± 2 ml kg−1 min−1, P = 0.6) or beyond typical measurement error. The IPC decreased 1-km time trial time by 0.4% (0.5 ± 2 s), while the control group decreased by 1% (1.5 ± 3 s), but neither change was significant compared to baseline (P = 0.2). There was also no difference in time trial improvement between IPC and control (P = 0.6). However, there was a trend towards IPC significantly improving running economy at low intensity (P = 0.057).
Conclusion
Our data suggest that over a normal 8-week season in a population of highly trained middle-distance runners there is no benefit of undergoing chronic, repeated IPC treatments before training for augmenting maximal aerobic power or 1-km performance time.