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      Are Prepubertal Children Metabolically Comparable to Well-Trained Adult Endurance Athletes?

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      Sports Medicine
      Springer Nature

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          Enzyme activity and fiber composition in skeletal muscle of untrained and trained men.

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            The level and tempo of children???s physical activities: an observational study

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              Recovery of power output and muscle metabolites following 30 s of maximal sprint cycling in man.

              1. The recovery of power output and muscle metabolites was examined following maximal sprint cycling exercise. Fourteen male subjects performed two 30 s cycle ergometer sprints separated by 1.5, 3 and 6 min of recovery, on three separate occasions. On a fourth occasion eight of the subjects performed only one 30 s sprint and muscle biopsies were obtained during recovery. 2. At the end of the 30 s sprint phosphocreatine (PCr) and ATP contents were 19.7 +/- 1.2 and 70.5 +/- 6.5% of the resting values (rest), respectively, while muscle lactate was 119.0 +/- 4.6 mmol (kg dry wt)-1 and muscle pH was 6.72 +/- 0.06. During recovery, PCr increased rapidly to 65.0 +/- 2.8% of rest after 1.5 min, but reached only 85.5 +/- 3.5% of rest after 6 min of recovery. At the same time ATP and muscle pH remained low (19.5 +/- 0.9 mmol (kg dry wt)-1 and 6.79 +/- 0.02, respectively). Modelling of the individual PCr resynthesis using a power function curve gave an average half-time for PCr resynthesis of 56.6 +/- 7.3 s. 3. Recovery of peak power output (PPO), peak pedal speed (maxSp) and mean power during the initial 6 s (MPO6) of sprint 2 did not reach the control values after 6 min of rest, and occurred in parallel with the resynthesis of PCr, despite the low muscle pH. High correlations (r = 0.71-0.86; P 0.05). 4. These data suggest that PCr resynthesis after 30 s of maximal sprint exercise is slower than previously observed after dynamic exercise of longer duration, and PCr resynthesis is important for the recovery of power during repeated bouts of sprint exercise.
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                Author and article information

                Journal
                Sports Medicine
                Sports Med
                Springer Nature
                0112-1642
                1179-2035
                August 2017
                January 2 2017
                August 2017
                : 47
                : 8
                : 1477-1485
                Article
                10.1007/s40279-016-0671-1
                28044282
                c3575424-fb42-4c63-a230-5745fac6752b
                © 2017

                http://www.springer.com/tdm

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