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Effect of pedaling rates and myosin heavy chain composition in the vastus lateralis muscle on the power generating capability during incremental cycling in humans.
Physiol Res. 2008; 57(6):873-84.PR

Abstract

In this study, we have determined power output reached at maximal oxygen uptake during incremental cycling exercise (P(I, max)) performed at low and at high pedaling rates in nineteen untrained men with various myosin heavy chain composition (MyHC) in the vastus lateralis muscle. On separate days, subjects performed two incremental exercise tests until exhaustion at 60 rev min(-1) and at 120 rev min(-1). In the studied group of subjects P(I, max) reached during cycling at 60 rev min(-1) was significantly higher (p=0.0001) than that at 120 rev min(-1) (287+/-29 vs. 215+/-42 W, respectively for 60 and 120 rev min(-1)). For further comparisons, two groups of subjects (n=6, each) were selected according to MyHC composition in the vastus lateralis muscle: group H with higher MyHC II content (56.8+/-2.79 %) and group L with lower MyHC II content in this muscle (28.6+/-5.8 %). P(I, max) reached during cycling performed at 60 rev min(-1) in group H was significantly lower than in group L (p=0.03). However, during cycling at 120 rev min(-1), there was no significant difference in P(I, max) reached by both groups of subjects (p=0.38). Moreover, oxygen uptake (VO(2)), blood hydrogen ion [H(+)], plasma lactate [La(-)] and ammonia [NH(3)] concentrations determined at the four highest power outputs completed during the incremental cycling performed at 60 as well as 120 rev min(-1), in the group H were significantly higher than in group L. We have concluded that during an incremental exercise performed at low pedaling rates the subjects with lower content of MyHC II in the vastus lateralis muscle possess greater power generating capabilities than the subjects with higher content of MyHC II. Surprisingly, at high pedaling rate, power generating capabilities in the subjects with higher MyHC II content in the vastus lateralis muscle did not differ from those found in the subjects with lower content of MyHC II in this muscle, despite higher blood [H(+)], [La(-)] and [NH(3)] concentrations. This indicates that at high pedaling rates the subjects with higher percentage of MyHC II in the vastus lateralis muscle perform relatively better than the subjects with lower percentage of MyHC II in this muscle.

Authors+Show Affiliations

Department of Physiology and Biochemistry, Faculty of Rehabilitation, University School of Physical Education, Kraków, Poland. joanna.majerczak@awf.krakow.plNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18052677

Citation

Majerczak, J, et al. "Effect of Pedaling Rates and Myosin Heavy Chain Composition in the Vastus Lateralis Muscle On the Power Generating Capability During Incremental Cycling in Humans." Physiological Research, vol. 57, no. 6, 2008, pp. 873-84.
Majerczak J, Szkutnik Z, Duda K, et al. Effect of pedaling rates and myosin heavy chain composition in the vastus lateralis muscle on the power generating capability during incremental cycling in humans. Physiol Res. 2008;57(6):873-84.
Majerczak, J., Szkutnik, Z., Duda, K., Komorowska, M., Kolodziejski, L., Karasinski, J., & Zoladz, J. A. (2008). Effect of pedaling rates and myosin heavy chain composition in the vastus lateralis muscle on the power generating capability during incremental cycling in humans. Physiological Research, 57(6), 873-84.
Majerczak J, et al. Effect of Pedaling Rates and Myosin Heavy Chain Composition in the Vastus Lateralis Muscle On the Power Generating Capability During Incremental Cycling in Humans. Physiol Res. 2008;57(6):873-84. PubMed PMID: 18052677.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of pedaling rates and myosin heavy chain composition in the vastus lateralis muscle on the power generating capability during incremental cycling in humans. AU - Majerczak,J, AU - Szkutnik,Z, AU - Duda,K, AU - Komorowska,M, AU - Kolodziejski,L, AU - Karasinski,J, AU - Zoladz,J A, Y1 - 2007/11/30/ PY - 2007/12/7/pubmed PY - 2009/3/6/medline PY - 2007/12/7/entrez SP - 873 EP - 84 JF - Physiological research JO - Physiol Res VL - 57 IS - 6 N2 - In this study, we have determined power output reached at maximal oxygen uptake during incremental cycling exercise (P(I, max)) performed at low and at high pedaling rates in nineteen untrained men with various myosin heavy chain composition (MyHC) in the vastus lateralis muscle. On separate days, subjects performed two incremental exercise tests until exhaustion at 60 rev min(-1) and at 120 rev min(-1). In the studied group of subjects P(I, max) reached during cycling at 60 rev min(-1) was significantly higher (p=0.0001) than that at 120 rev min(-1) (287+/-29 vs. 215+/-42 W, respectively for 60 and 120 rev min(-1)). For further comparisons, two groups of subjects (n=6, each) were selected according to MyHC composition in the vastus lateralis muscle: group H with higher MyHC II content (56.8+/-2.79 %) and group L with lower MyHC II content in this muscle (28.6+/-5.8 %). P(I, max) reached during cycling performed at 60 rev min(-1) in group H was significantly lower than in group L (p=0.03). However, during cycling at 120 rev min(-1), there was no significant difference in P(I, max) reached by both groups of subjects (p=0.38). Moreover, oxygen uptake (VO(2)), blood hydrogen ion [H(+)], plasma lactate [La(-)] and ammonia [NH(3)] concentrations determined at the four highest power outputs completed during the incremental cycling performed at 60 as well as 120 rev min(-1), in the group H were significantly higher than in group L. We have concluded that during an incremental exercise performed at low pedaling rates the subjects with lower content of MyHC II in the vastus lateralis muscle possess greater power generating capabilities than the subjects with higher content of MyHC II. Surprisingly, at high pedaling rate, power generating capabilities in the subjects with higher MyHC II content in the vastus lateralis muscle did not differ from those found in the subjects with lower content of MyHC II in this muscle, despite higher blood [H(+)], [La(-)] and [NH(3)] concentrations. This indicates that at high pedaling rates the subjects with higher percentage of MyHC II in the vastus lateralis muscle perform relatively better than the subjects with lower percentage of MyHC II in this muscle. SN - 0862-8408 UR - https://www.unboundmedicine.com/medline/citation/18052677/Effect_of_pedaling_rates_and_myosin_heavy_chain_composition_in_the_vastus_lateralis_muscle_on_the_power_generating_capability_during_incremental_cycling_in_humans_ L2 - http://www.biomed.cas.cz/physiolres/pdf/57/57_873.pdf DB - PRIME DP - Unbound Medicine ER -