ORIGINAL ARTICLE

Cadence selection affects metabolic responses during cycling and subsequent running time to fatigue

F Vercruyssen¹, R Suriano², D Bishop², C Hausswirth³, J Brisswalter¹

¹ Department of Sport Ergonomics and Performance, University of Toulon-Var, BP 132, 83957 La Garde cedex, France
² School of Human Movement and Exercise Science, University of Western Australia, Crawley, WA 6009, Australia
³ Laboratory of Physiology and Biomechanics, Nationale Institute of Sport and Physical Education, 11, avenue du Tremblay, 75 012 Paris, France

Correspondence to:
Correspondence to:
Dr Vercruyssen
Department of Sport Ergonomics and Performance, University of Toulon-Var, BP 132, 83957 La Garde cedex, France; vercruyssen{at}univ-tln.fr

Objectives: To investigate the effect of cadence selection during the final minutes of cycling on metabolic responses, stride pattern, and subsequent running time to fatigue.

Methods: Eight triathletes performed, in a laboratory setting, two incremental tests (running and cycling) to determine peak oxygen uptake (VO₂PEAK) and the lactate threshold (LT), and three cycle-run combinations. During the cycle-run sessions, subjects completed a 30 minute cycling bout (90% of LT) at (a) the freely chosen cadence (FCC, 94 (5) rpm), (b) the FCC during the first 20 minutes and FCC–20% during the last 10 minutes (FCC–20%, 74 (3) rpm), or (c) the FCC during the first 20 minutes and FCC+20% during the last 10 minutes (FCC+20%, 109 (5) rpm). After each cycling bout, running time to fatigue (T_max) was determined at 85% of maximal velocity.

Results: A significant increase in T_max was found after FCC–20% (894 (199) seconds) compared with FCC and FCC+20% (651 (212) and 624 (214) seconds respectively). VO₂, ventilation, heart rate, and blood lactate concentrations were significantly reduced after 30 minutes of cycling at FCC–20% compared with FCC+20%. A significant increase in VO₂ was reported between the 3rd and 10th minute of all T_max sessions, without any significant differences between sessions. Stride pattern and metabolic variables were not significantly different between T_max sessions.

Conclusions: The increase in T_max after FCC–20% may be associated with the lower metabolic load during the final minutes of cycling compared with the other sessions. However, the lack of significant differences in metabolic responses and stride pattern between the run sessions suggests that other mechanisms, such as changes in muscular activity, probably contribute to the effects of cadence variation on T_max.

Abbreviations: FCC, freely chosen cadence; HR, heart rate; [La^–], lactate concentration; LT, lactate threshold; P_max, maximal power output; V_max, maximal running speed; VE, minute ventilation; VO₂, oxygen uptake; VO₂PEAK, peak oxygen uptake; VO_2SC, VO₂ slow component

Keywords: triathletes; cycling cadence; running performance; metabolic load; stride pattern

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