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Power and metabolic responses during supramaximal exercise in 100‐m and 800‐m runners
Author(s) -
Denis C.,
Linossler M. T.,
Dormols D.,
Padilla S.,
Geyssant A.,
Lacour J. R.,
Inbar O.
Publication year - 1992
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/j.1600-0838.1992.tb00321.x
Subject(s) - anaerobic exercise , creatine , citrate synthase , chemistry , oxidative phosphorylation , adenosine triphosphate , bicycle ergometer , medicine , lactate dehydrogenase , creatine kinase , endocrinology , zoology , biochemistry , biology , physical therapy , heart rate , enzyme , blood pressure
The differences in ergometric power and in biochemical characteristics of the vastus lateralis muscle (VL) between 100‐m and 800‐m runners (R) were studied in 2 groups of 8 male athletes (100m‐R and 800m‐R) during a 45‐s all‐out cycle ergometer exercise. Peak power (PP), mean power (MP) and percentage of fatigue were respectively 24%, 13% and 24% higher in the 100m‐R than in 800m‐R, whereas total work output was similar in both groups. In 100m‐R, there was a higher percentage of fast twitch (FT) fibres, a higher buffer (mß) titration capacity and a lower oxidative potential expressed by citrate synthase, 3‐hydroxyacyi‐CoA dehydrogenase and cytochrome oxidase than in 800m‐R. During all‐out exercise, muscle lactate [lact] and protons [H+] accumulated significantly more in 100m‐R than in 800m‐R with a corresponding muscle pH of 6.49 ± 0.07 and 6.63 ± 0.12. However, the decreases in adenosine triphosphate (ATP) and creatine phosphate were not different between the two groups. Significant correlations were found between PP (or % fatigue) and Δ[H+], Δ[lact], Δ[ATP], %FT or oxidative capacity when the two groups were pooled together. It was concluded mat the difference in %FT, in titration mß and in the contribution of the glycolytic and oxidative processes observed in VL between 100m‐R (pure anaerobic training) and 800m‐R (mixed aerobic‐anaerobic training) are determinant factors in the pattern of energy output during supramaximal exercise.