A comparison of head motion and prefrontal haemodynamics during upright and recumbent cycling exercise.
The aim of this observational study was to compare head motion and prefrontal haemodynamics during exercise using three commercial cycling ergometers. Participants (n = 12) completed an incremental exercise test to exhaustion during upright, recumbent and semi-recumbent cycling. Head motion (using accelerometry), physiological data (oxygen uptake, end-tidal carbon dioxide [PETCO2] and heart rate) and changes in prefrontal haemodynamics (oxygenation, deoxygenation and blood volume using near infrared spectroscopy [NIRS]) were recorded. Despite no difference in oxygen uptake and heart rate, head motion was higher and PETCO2was lower during upright cycling at maximal exercise (P<0·05). Analyses of covariance (covariates: head motion P>0·05; PETCO2, P<0·01) revealed that prefrontal oxygenation was higher during semi-recumbent than recumbent cycling and deoxygenation and blood volume were higher during upright than recumbent and semi-recumbent cycling (respectively; P<0·05). This work highlights the robustness of the utility of NIRS to head motion and describes the potential postural effects upon the prefrontal haemodynamic response during upright and recumbent cycling exercise.
Department of Sports Tourism, Physiology and Medicine, National Research Tomsk State University, Tomsk, Russia.
Gavin D
GD
Tempest
Alliance for Research in Exercise, Nutrition and Activity (ARENA), Sansom Institute for Health Research, School of Health Sciences, University of South Australia, Adelaide, South Australia, Australia.
Roger G
RG
Eston
Alliance for Research in Exercise, Nutrition and Activity (ARENA), Sansom Institute for Health Research, School of Health Sciences, University of South Australia, Adelaide, South Australia, Australia.
Gaynor
G
Parfitt
D061725:Accelerometry; D000222:Adaptation, Physiological; D000328:Adult; D001642:Bicycling; D001810:Blood Volume; D002560:Cerebrovascular Circulation; D015444:Exercise; D005260:Female; D019416:Head Movements; D006339:Heart Rate; D006439:Hemodynamics; D006801:Humans; D008297:Male; D010100:Oxygen / Q000097:blood; D010101:Oxygen Consumption; D011187:Posture; D017397:Prefrontal Cortex / Q000098:blood supply*; D019265:Spectroscopy, Near-Infrared; D013997:Time Factors; D055815:Young Adult
D010100:Oxygen
cerebral oxygenation; cycle ergometry; exercise intensity; head motion; maximal exercise testing; near infrared spectroscopy