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Clin J Sport Med. 2011 Sep;21(5):422-7. doi: 10.1097/JSM.0b013e3182293891.

Effects of Ramadan intermittent fasting on middle-distance running performance in well-trained runners.

Author information

  • 1Laboratory of Human Motricity, Education Sport and Health, University of Nice Sophia Antipolis, Nice, France. brisswalter@unice.fr

Erratum in

  • Clin J Sport Med. 2011 Nov;21(6):546. ) Hauswirth, Christophe [corrected to Hausswirth, Christophe].

Abstract

OBJECTIVE:

To assess whether Ramadan intermittent fasting (RIF) affects 5000-m running performance and physiological parameters classically associated with middle-distance performance.

DESIGN:

Two experimental groups (Ramadan fasting, n = 9, vs control, n = 9) participated in 2 experimental sessions, one before RIF and the other at the last week of fasting.

SETTING:

For each session, subjects completed 4 tests in the same order: a maximal running test, a maximal voluntary contraction (MVC) of knee extensor, 2 rectangular submaximal exercises on treadmill for 6 minutes at an intensity corresponding to the first ventilatory threshold (VT1), and a running performance test (5000 m).

PARTICIPANTS:

Eighteen, well-trained, middle-distance runners.

MAIN OUTCOME MEASURES:

Maximal oxygen consumption, MVC, running performance, running efficiency, submaximal VO(2) kinetics parameters (VO(2), VO(2)b, time constant τ, and amplitude A1) and anthropometric parameters were recorded or calculated.

RESULTS:

At the end of Ramadan fasting, a decrease in MVC was observed (-3.2%; P < 0.00001; η, 0.80), associated with an increase in the time constant of oxygen kinetics (+51%; P < 0.00007; η, 0.72) and a decrease in performance (-5%; P < 0.0007; η, 0.51). No effect was observed on running efficiency or maximal aerobic power.

CONCLUSIONS:

These results suggest that Ramadan changes in muscular performance and oxygen kinetics could affect performance during middle-distance events and need to be considered to choose training protocols during RIF.

PMID:
21857506
[PubMed - indexed for MEDLINE]
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