Cardiovascular effects of cadence and workload

J. L. Moore, J. D. Shaffrath, G. A. Casazza, Charles L Stebbins

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Increases in cadence may augment SV during submaximal cycling (> 65% V̇O2max) via effects of increased muscle pump activity on preload. At lower workloads (45-65% V̇O2max), SV tends to plateau, suggesting that effects of increases in cadence on pump activity have little influence on SV. We hypothesized that cadence-induced increases in CO at submaximal workloads, where SV tends to plateau, are due to elevations in HR and/or O2 extraction. SV, CO, HR, V̇O2, and Δa-vO2 were assessed at 80 and 100 rpm during workloads of 50% (LO) or 65% (HI) of V̇O2max in 11 male cyclists. No changes in SV were seen. CO was higher at 100 rpm in 10 of 11 subjects at LO (18.1 ± 2.7 vs. 17.2 ± 2.6 L/min). V̇O2 at both workloads was greater at 100 than 80 rpm as was HR (LO: 129 ± 11 vs. 121 ± 10 beats/min; HI: 146 ± 13 vs. 139 ± 14 beats/min) (p < 0.05). Δa-vO2 was greater at HI compared to LO at 80 (15.1 ± 1.6 vs. 13.6 ± 1.3 ml) and 100 rpm (16.0 ± 1.7 vs. 15.1 ± 1.6 ml) (p < 0.05). Results suggest that increases in O2 demand during low submaximal cycling (50% V̇O2max) at high cadences are met by HR-induced increases in CO. At higher workloads (65% V̇O 2max), inability of higher cadences to increase CO and O2 delivery is offset by greater O2 extraction.

Original languageEnglish (US)
Pages (from-to)116-119
Number of pages4
JournalInternational Journal of Sports Medicine
Volume29
Issue number2
DOIs
StatePublished - Feb 2008

Keywords

  • Arterial-venous oxygen difference
  • Cadence
  • Cardiac output
  • Cycling
  • Heart rate
  • Stroke volume

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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    Moore, J. L., Shaffrath, J. D., Casazza, G. A., & Stebbins, C. L. (2008). Cardiovascular effects of cadence and workload. International Journal of Sports Medicine, 29(2), 116-119. https://doi.org/10.1055/s-2007-965819