Effekt av periodisk fasta (Ramadan) på prestation i medeldistanslöpning

[King Grub]

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 &OV0312;O2 kinetics parameters (&OV0312;O2, &OV0312;O2b, 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.

Clin J Sport Med. 2011 Aug 19. Effects of Ramadan Intermittent Fasting on Middle-Distance Running Performance in Well-Trained Runners.

[Beelz]

Presterade dom sämre eller bättre? Fattade inte resultat delen...

[vicarious]

Lite sämre?

[zeusden1]

Lite sämre förstår jag det som

and a decrease in performance (-5%; P < 0.0007; η, 0.51)

5 % sämre?

[King Grub]

The behavioural modifications that accompany Ramadan intermittent fasting (RIF) are usually associated with some alterations in the metabolic, physiological, and psychological responses of athletes that may affect sport performance. Muslim athletes who are required to train and/or compete during the month-long, diurnal fast must adopt coping strategies that allow them to maintain physical fitness and motivation if they are to perform at the highest level. This updated review aims to present the current state of knowledge of the effects of RIF on training and performance, focusing on key-factors that contribute to the effects of Ramadan on exercise performance: energy restriction, sleep deprivation, circadian rhythm perturbation, dehydration, and alterations in the training load. The available literature contain few studies that have examined the effects of RIF on physical performance in athletes and, to date, the results are inconclusive, so the effects of RIF on competition outcomes are not at present wholly understood. The diverse findings probably indicate individual differences in the adaptability and self-generated coping strategies of athletes during fasting and training. However, the results of the small number of well-controlled studies that have examined the effects of Ramadan on athletic performance suggest that few aspects of physical fitness are negatively affected, and where decrements are observed these are usually modest. Subjective feelings of fatigue and other mood indicators are often cited as implying additional stress on the athlete throughout Ramadan, but most studies show that these factors may not result in decreases in performance and that perceived exercise intensity is unlikely to increase to any significant degree. Current evidence from good, well-controlled research supports the conclusion that athletes who maintain their total energy and macronutrient intake, training load, body composition, and sleep length and quality are unlikely to suffer any substantial decrements in performance during Ramadan. Further research is required to determine the effect of RIF on the most challenging events or exercise protocols and on elite athletes competing in extreme environments.

J Sports Sci. 2012 Jun 27. The effects of Ramadan intermittent fasting on athletic performance: Recommendations for the maintenance of physical fitness.

[exevision]

Finns det någon på kolo som kör ramadan? I norra sverige får man ju då typ aldrig äta under sommaren.

[Morty]

Ursprungligen postat av exevision

Finns det någon på kolo som kör ramadan? I norra sverige får man ju då typ aldrig äta under sommaren.

Det finns såklart regler för midnattsol.

[Silencer]

Ursprungligen postat av exevision

Finns det någon på kolo som kör ramadan? I norra sverige får man ju då typ aldrig äta under sommaren.

de ringer någon skäggig gubbe i irak som säger när solen går ner

[Cerberus]

de får väl inte ens dricka vatten under det väl? ne varför bryr jag mig ens..

[Dakke]

sprang dom under eller efter fastan?

edit: under

edit2: hmmm... sprang dom på tom mage då?

[tjing]

Om de sprang under fastan, sprang de självklart på "tom" mage eller vad menar du?

[Eddie Vedder]

Ursprungligen postat av Dakke

sprang dom under eller efter fastan?

edit: under

edit2: hmmm... sprang dom på tom mage då?

När? Det är en review.

EDIT: Eller pratar du om förstainlägget i tråden?

[Dakke]

Ursprungligen postat av tjing

Om de sprang under fastan, sprang de självklart på "tom" mage eller vad menar du?

Om jag förstått det rätt äter ramadanare morgon och kväll, sprang de på natten då så att de skulle ha energi?

Ursprungligen postat av Eddie Vedder

När? Det är en review.

EDIT: Eller pratar du om förstainlägget i tråden?

nu förstår jag inte

[Eddie Vedder]

Ursprungligen postat av Dakke

nu förstår jag inte

Vilken av artiklarna pratar du om? Det är ju bara den första som är en studie som testat något.

[Dakke]

Ursprungligen postat av Eddie Vedder

Vilken av artiklarna pratar du om? Det är ju bara den första som är en studie som testat något.

bara läst första studien!