Mer kolhydrat = fler reps i Crossfit

[King Grub]

CrossFit is a metabolically demanding strength and conditioning method which performance may benefit from a carbohydrate (CHO)-rich diet. This study investigated the effect of three consecutive days of high CHO intake on CrossFit performance and corresponding metabolically -related variables in strength trained individuals. Eighteen subjects with a CHO intake of <6 g/kg/day were randomly assigned into a CHO (n = 9) or control (C) group (n =9) and underwent a 9-day training protocol. During days 1, 5, and 9, performance was measured as repetitions completed during a 12 minute CrossFit workout. Oxygen consumption (VO2), respiratory exchange ratio (RER), and blood lactate (BL) were also measured. Days 6-8, the CHO group increased CHO intake from <6 g/kg/day to 6-8 g/kg/day; the C group maintained their current intake of <6 g/kg/day. On days 6 and 7 both groups performed CrossFit workouts followed by a day of rest prior to day 9. There was a significant increase in repetitions completed in both groups in day 9 (vs. means score of day 1 + 5) (p = 0.002), but no differences between C and CHO groups (p = 0.111). However, the CHO group displayed a 15.2 repetition increase (+10.9%) in day 9, compared to 5.7 (+4.2%) by the C group. VO2, RER, and BL were not influenced by the experimental intervention. Our results suggest that the CrossFit-embraced practice of moderately-low CHO diets may be adequate in CHO during short periods of training, however, given the noted trend, extended training periods may be effected.

Int J Exerc Sci. 2016 Oct 1;9(3):460-470. The Effect of a Moderately Low and High Carbohydrate Intake on Crossfit Performance.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5065325/

[poppen11]

Så de får alltså ej signifikanta resultat men drar likväl slutsatsen att det är skillnad?

[King Grub]

Det betyder inte det du tror att det menar. Det betyder att resultaten inte kan bero på slumpen. Det betyder inte "obetydliga".

[poppen11]

Det betyder inte det du tror att det menar. Det betyder att resultaten inte kan bero på slumpen. Det betyder inte "obetydliga".

Hela poängen med signifikanstest är att genom en manipulation hos någon variabel sedermera kunna utröna ifall man fått resultat som inte bara är slumpmässig variation.

[Bjern]

Så de får alltså ej signifikanta resultat men drar likväl slutsatsen att det är skillnad?

Läs igen.

Our results suggest that the CrossFit-embraced practice of moderately-low CHO diets may be adequate in CHO during short periods of training, however, given the noted trend, extended training periods may be effected.

De hävdar ju att det moderata låga intaget av <6 g per kg/kv är tillräckligt under kortare perioder, men att den trend som sågs i hög-gruppen kan ha betydelse under längre perioder.

[poppen11]

Läs igen.



De hävdar ju att det moderata låga intaget av <6 g per kg/kv är tillräckligt under kortare perioder, men att den trend som sågs i hög-gruppen kan ha betydelse under längre perioder.

Jo, det var precis det jag syftade på - när blir en trend bara naturlig slumpmässig variation? p=0.24, 0.50?