2.1 Mechanism of muscle fatigue due to lactic acid
Most researchers have argued that any detrimental effects of HLa on muscle and exercise performance are due to H+ rather than La− (Fitts, 2003, Hinzpeter.J,2014). There is a vast literature in which a decline in maximal muscle force generation is correlated …show more content…
Acute accumulation of BLa can induce metabolic acidosis which sequentially can decrease the work capacity of a person’s muscles leading to a decrease in performance (Myers J, Ashley E (1997);Neric et al.,(2009). Force production recovers almost fully while muscle pH remains depressed during recovery, suggesting that the high [H+] may indirectly affect performance by impairing energy metabolism (Sahlin, K, …show more content…
2004); (ii) an increase in lactate elimination from the muscle; (iii) lactate transportation to other tissues (liver, heart, muscles) where it can be oxidized or used as a substrate for glucose resynthesis; or (iv) a combination of these 3 factors (Gollnick et al. 1986; Neric et al. 2009). Several studies have suggested that maintaining a level of activity, even low, generates oxidative activity, which may decrease the lactate available for glycogen resynthesis (Choi et al. 1994; Fairchild et al. 2003). During recovery, the decrease in blood lactate concentration is generally associated with a decrease in H+ concentration causing a return to higher pH values and HCO3 – concentrations both in the blood and the active muscle (Yoshida et al. 1996) .Recovery methods limit the negative effects linked to accumulation of H+ ions and decreased pH, which commonly affect the contractile process during repeated performances (Fitts