Experimental dependence of skeletal muscle bioenergetic system variables on parameters / variables related to ATP usage activity.

<p>A. Original (not re-scaled) dependence of PCr, P_i, ADP, ATP, pH after 8–12 min of stimulation on electrical stimulation frequency in rat skeletal muscle (Table I and II in [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0195620#pone.0195620.ref024" target="_blank">24</a>]). B. Original (not re-scaled) dependence of PCr, P_i and ADP after 4 min of exercise on ATP turnover rate (% of maximal) in human calf muscle during voluntary constant-power exercise (pedal pressing) (extracted from Fig 6 in [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0195620#pone.0195620.ref014" target="_blank">14</a>]). C. Dependence of the decrease in PCr and pH (in relation to rest) after 6 min of exercise on work intensity in human quadriceps muscles during voluntary constant-power exercise (bilateral knee extension) (closed symbols, [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0195620#pone.0195620.ref002" target="_blank">2</a>]; open symbols, [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0195620#pone.0195620.ref035" target="_blank">35</a>]).