RT @EatsleepfitJeff: 🚴‍♂️ New open-access paper from our group out in EJAP!. We show durability of the moderate-to-heavy intensity transiti….

RT @Gonzalez_JT: Exercise prevents the seasonal decline in vitamin D metabolites (even when energy balance is maintained!). New RCT from @o….

These results suggest, at least in the protocol used, that adding eccentric load via downhill running did not exacerbate the reduction in running speed at the moderate-to-heavy intensity.

Running speed at VT1 declined following prolonged running in both trials (~6-8%), with no differences between-trials.

Andrew took a rigorous approach here - he measured VT1 during a downhill incremental test to ensure these segments were at the same relative intensity as the level-ground segments.

In one trial, the runners did blocks of downhill (-10%) running throughout the 120 min, to increase the eccentric load and induce muscle damage.

Andrew measured running speed at the moderate-to-heavy intensity transition (VT1) on level-ground, before and after 120 min of moderate-intensity running.

Congratulations Andrew Barrett on your first publication!. Continuing our durability work. Prolonged running reduces speed at the moderate-to-heavy intensity transition without additional reductions due to increased eccentric load. @EJAP_official.

RT @sweatscience: A new review digs into the science of "lactic acidosis" and muscle fatigue. Key points:.- we don't have "lactic acid" in….

RT @benhunter92: Recently there’s been plenty of good work in the (re?)emerging field of durability. Our review published in @ExpPhysiol….

RT @sweatscience: Data from 120,000 runners shows that slow and fast marathoners do essentially the same amount of medium and hard training….

To help with physiologically-based training programming and load monitoring, we need to develop tools that appreciate the reduction in power output at thresholds over time as exercise progresses, and account for the effects of nutrition.

So, carbohydrate ingestion during prolonged cycling improved durability of the moderate-to-heavy transition. Based on previous data, we think this effect is unlikely related to preservation of muscle glycogen, and instead may be related to better preservation of blood glucose.

Blood glucose concentrations were better maintained during the prolonged phase in the carbohydrate trial, which supports a role for blood glucose in these effects

We saw similar effects on 5-min TT power, although the reduction seen in the carbohydrate trial (~4%) was not significantly different to the no carbohydrate trial (~10%), probably due to some variability in the data

As previously, prolonged cycling reduced power output at VT1 by ~6%, but the size of this reduction was reduced when carbohydrates were ingested (~3%). The differences between-trials were significant

We had 12 cyclists perform an assessment of power output at the moderate-to-heavy transition (VT1) and 5-min TT three times, in random order: (i) when fresh, (ii) after 150 min of moderate cycling without carbohydrate, (iii) after 150 min of moderate cycling with carbohydrate

The lack of muscle glycogen sparing with carbohydrate ingestion during prolonged exercise has been shown many times previously, so we thought it might have something to do with blood glucose instead.

Previously, carbohydrate ingestion during prolonged cycling mitigated the reduction in critical power, without preserving muscle glycogen stores.

We are interested in why threshold power falls during prolonged cycling, and whether carbohydrate availability might be an important factor.