Are there some new reports about ATP contribution for extreme power contractions? I need to develop a model for predicting it and then which variables could be tested.
The rule of thumb I have always heard is a few seconds and that will be dependent on the intensity of the contraction, fiber type, etc.
During maximal intensity exercise, such as sprinting, ATP is re-synthesized from phosphocreatine and anaerobic glycolysis, while aerobic metabolism plays an important role as duration is increased and/or high intensity exercise bouts are repeated. Interestingly, the concentration of ATP never drops below 60-70% of the resting concentration, i.e. the ATP pool of the muscle is preserved, although in some muscle fibres, ATP may drop to zero (see refs below).This is dependent on fiber type. For furthter reading, please see the papers below
Bogdanis GC, Nevill ME, Boobis LH, Lakomy HK, Nevill AM. Recovery of power output and muscle metabolites following 30 s of maximal sprint cycling in man. J Physiol. 1995 Jan 15;482 ( Pt 2):467-80.
Bogdanis GC, Nevill ME, Lakomy HK, Boobis LH. Power output and muscle metabolism during and following recovery from 10 and 20 s of maximal sprint exercise in humans.Acta Physiol Scand. 1998 Jul;163(3):261-72.
Nevill AM, Jones DA, McIntyre D, Bogdanis GC, Nevill ME.A model for phosphocreatine resynthesis. J Appl Physiol (1985). 1997 Jan;82(1):329-35.
Bogdanis GC, Nevill ME, Boobis LH, Lakomy HK. Contribution of phosphocreatine and aerobic metabolism to energy supply during repeated sprint exercise. J Appl Physiol (1985). 1996 Mar;80(3):876-84.
Hellsten Y, Richter EA, Kiens B, Bangsbo J. AMP deamination and purine exchange in human skeletal muscle during and after intense exercise. J Physiol. 1999 Nov 1;520 Pt 3:909-20.
Söderlund K, Hultman E. ATP and phosphocreatine changes in single human muscle fibers after intense electrical stimulation. Am J Physiol. 1991 Dec;261(6 Pt 1):E737-41.
Gray SR, Söderlund K, Ferguson RA. ATP and phosphocreatine utilization in single human muscle fibres during the development of maximal power output at elevated muscle temperatures. J Sports Sci. 2008 May;26(7):701-7. doi: 10.1080/02640410701744438.
Hi Gordon.
Do you know any field test that let discriminate between different macroergic substrates supply? Please, attach some article if possible.
Thanks, Frenkel
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