title: Physiological assessment of isolated running does not directly replicate running capacity after triathlon-specific cycling.
abstract: Triathlon running is affected by prior cycling and power output during triathlon cycling is variable in nature. We compared constant and triathlon-specific variable power cycling and their effect on subsequent submaximal running physiology. Nine well-trained male triathletes (age 24.6 ± 4.6 years, [Formula: see text] 4.5 ± 0.4 L · min(-1); mean ± SD) performed a submaximal incremental run test, under three conditions: no prior exercise and after a 1 h cycling trial at 65% of maximal aerobic power with either a constant or a variable power profile. The variable power protocol involved multiple 10-90 s intermittent efforts at 40-140% maximal aerobic power. During cycling, pulmonary ventilation (22%, ± 14%; mean; ± 90% confidence limits), blood lactate (179%, ± 48%) and rating of perceived exertion (7.3%, ± 10.2%) were all substantially higher during variable than during constant power cycling. At the start of the run, blood lactate was 64%, ± 61% higher after variable compared to constant power cycling, which decreased running velocity at 4 mM lactate threshold by 0.6, ± 0.9 km · h(-1). Physiological responses to incremental running are negatively affected by prior cycling and, to a greater extent, by variable compared to even-paced cycling. Testing and training of triathletes should account foe higher physiological cost of triathlon-specific cycling and its effect on subsequent running.
authors.affiliation: a Faculty of Health , University of Canberra , Canberra , Australia.
authors.forename: Naroa
authors.initials: N
authors.lastname: Etxebarria
authors.forename: Julie
authors.initials: J
authors.lastname: Hunt
authors.forename: Steve
authors.initials: S
authors.lastname: Ingham
authors.forename: Richard
authors.initials: R
authors.lastname: Ferguson
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology*; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010101:Oxygen Consumption; D010465:Perception; D010807:Physical Endurance / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D012123:Pulmonary Ventilation; D012420:Running / Q000502:physiology*; D013177:Sports / Q000502:physiology*; D013550:Swimming / Q000502:physiology; D055815:Young Adult
chemical_list: D019344:Lactic Acid