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The pressor response to submaximal cycle ergometry while using aerodynamic handlebars

D P Heil1

  • 1Department of Exercise Science, University of Massachusetts, Amherst, MA, USA.

International Journal of Sports Medicine
|January 1, 1997
PubMed
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Increased shoulder loading during cycling affects physiological responses. Higher static loads alter heart rate and oxygen consumption relationships, potentially influencing cyclist torso positioning.

Area of Science:

  • Exercise Physiology
  • Sports Biomechanics
  • Cycling Performance

Background:

  • Aerobar use in cycling can alter shoulder musculature loading.
  • Understanding the physiological impact of static shoulder load is crucial for optimizing cycling performance and comfort.

Purpose of the Study:

  • To investigate the hypothesis that changes in static shoulder loading during submaximal cycle ergometry elicit a combined static and dynamic pressor response.
  • To examine the relationship between shoulder muscle activity and physiological variables (heart rate, oxygen consumption, ventilation) under varying inclines.

Main Methods:

  • Seven trained cyclists performed submaximal cycle ergometry on a modified ergometer at +5, 0, and -5 degree inclines using aerobars.
  • Measurements included heart rate (HR), ventilation (VE), oxygen consumption (VO2), and electromyography (EMG) of the triceps brachii (TB) and deltoid muscles (AD, PD).

Related Experiment Videos

  • Physiological and muscle activity data were analyzed for steady-state and non-steady-state responses across inclines.

    • Main Results:

    • Physiological variables showed steady-state responses at +5 and 0 degrees, but non-steady-state responses at -5 degrees.
    • At -5 degrees, HR, VO2, and VE strongly correlated with EMG from anterior deltoid (AD) and triceps brachii (TB) muscles.
    • Increased static load (steeper negative incline) positively shifted the HR-VO2 and VE-VO2 relationships, indicating altered physiological responses.

    Conclusions:

    • Static loading of the anterior deltoid and triceps brachii muscles can dissociate the heart rate-oxygen consumption relationship during cycling.
    • These physiological alterations due to static shoulder loading may influence torso positioning preferences in time-trial cyclists.
    • Further research could explore optimizing shoulder positioning for improved efficiency and reduced physiological strain in cycling.