Periodization Flashcards
Discuss the key literature of Hansen et al (2005)??
Showed firstly that two sessions every other day vs 1 session a day is a way of having both limbs perform identical work but only 1 limb completed 50% of training with reduced muscle glycogen.
Took biopsies in the vastus lateralis, showed a higher CS activity and a higher exercise capacity (kj) post training, in low compared to high muscle glycogen.
Discuss the Impey et al (2016) paper?
Wanted to look at how training with low CHO availability affects skeletal muscle in a whole body ex model.
Showed exercise with low muscle glycogen significantly lowers work capacity (high glycogen sig longer ex time than low glycogen)
Looking at AMPK activation, found initially higher AMPK activity (100min post ex) in low CHO compared to high CHO - presumed most likely due to the y section of the AMPK molecule.
Discuss the key work from Hulston et al (2010)??
Used the twice every other day method. Had P’s cycle for 90 mins @ 70% VO2 max -> 8 x 5 min HIT session with 1 min recovery.
Showed low muscle glycogen compromised HIT power output, with high being significantly than low for power (W).
Also showed post training, that for LOW, muscle glycogen contribution was significantly less and muscle TG was significantly higher. Alongside this, CD36 and B-had % change was significantly higher for low than high.
Discuss Cochrain et al (2010) ??
Had subjects perform 5x4min HIT bouts , then a 3h recovery followed by another 5x4 min HIT bout, on either high CHO (2.3g/kg) or low CHO (0.3g/kg).
In the post session, average power (w) was sig higher for low CHO than high CHO
Discuss the strong work from Marquet et al (2015)??
Looked at a sleep low protocol , where one group has no CHO overnight and 2x6g/kg bolus through the day, whereas the other group had 4g/kg - 2g/kg + 2g/kg - 4g/kg.
Found times were significantly quicker for sleep low condition compared to high in both a 10km and 20km TT, but high variation does occur.
What are some of the issues with low CHO/energy and the literature best associated with this work??
Impaired immune function (Nieman et al, 1998)
Reduced training intensity (Hulston et al, 2010)
Protein degradation /loss of muscle mass (Howarth et al, 2010)
Discuss the key findings of Lane et al’s (2013) work ??
Caffeine ingestion partially restores power output when in glycogen depleted state.
CHO mouth rinse improves power output to a greater extent when fasted compared to fed
Discuss Kasper et al (2016)??
Showed an improved exercise capacity (min) in a glycogen depleted state when CHO mouth rinse and caffeine were used together - indicating the additive effect, compared to CMR and placebo alone.
