Effects of prior heavy exercise on V(over dot)O-2 kinetics during heavy exercise are related to changes in muscle activity

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dc.contributor.author Burnley, Mark
dc.contributor.author Ball, Derek
dc.contributor.author Doust, Jonathan H.
dc.contributor.author Jones, Andrew M.
dc.date.accessioned 2008-11-05T14:00:46Z
dc.date.available 2008-11-05T14:00:46Z
dc.date.issued 2002-07
dc.identifier.citation Burnley , M , Ball , D , Doust , J H & Jones , A M 2002 , ' Effects of prior heavy exercise on V(over dot)O-2 kinetics during heavy exercise are related to changes in muscle activity ' Journal of Applied Physiology , vol 93 , pp. 167-174 . en
dc.identifier.issn 8750-7587
dc.identifier.other PURE: 79417
dc.identifier.other dspace: 2160/768
dc.identifier.uri http://hdl.handle.net/2160/768
dc.identifier.uri http://jap.physiology.org/cgi/content/full/93/1/167 en
dc.description Burnley, M., Doust, J.H., Ball, D. and Jones, A.M. (2002) Effects of prior heavy exercise on VO2 kinetics during heavy exercise are related to changes in muscle activity. Journal of Applied Physiology 93, 167-174. RAE2008 en
dc.description.abstract We hypothesized that the elevated primary O2 uptake (O2) amplitude during the second of two bouts of heavy cycle exercise would be accompanied by an increase in the integrated electromyogram (iEMG) measured from three leg muscles (gluteus maximus, vastus lateralis, and vastus medialis). Eight healthy men performed two 6-min bouts of heavy leg cycling (at 70% of the difference between the lactate threshold and peak O2) separated by 12 min of recovery. The iEMG was measured throughout each exercise bout. The amplitude of the primary O2 response was increased after prior heavy leg exercise (from mean ± SE 2.11 ± 0.12 to 2.44 ± 0.10 l/min, P <0.05) with no change in the time constant of the primary response (from 21.7 ± 2.3 to 25.2 ± 3.3 s), and the amplitude of the O2 slow component was reduced (from 0.79 ± 0.08 to 0.40 ± 0.08 l/min, P <0.05). The elevated primary O2 amplitude after leg cycling was accompanied by a 19% increase in the averaged iEMG of the three muscles in the first 2 min of exercise (491 ± 108 vs. 604 ± 151% increase above baseline values, P <0.05), whereas mean power frequency was unchanged (80.1 ± 0.9 vs. 80.6 ± 1.0 Hz). The results of the present study indicate that the increased primary O2 amplitude observed during the second of two bouts of heavy exercise is related to a greater recruitment of motor units at the onset of exercise. O2 uptake primary component; O2 uptake slow component; electromyogram; warm-up en
dc.format.extent 8 en
dc.language.iso eng
dc.relation.ispartof Journal of Applied Physiology en
dc.title Effects of prior heavy exercise on V(over dot)O-2 kinetics during heavy exercise are related to changes in muscle activity en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.​1152/​japplphysiol.​01217.​2001
dc.contributor.institution Department of Sport & Exercise Science en
dc.description.status Peer reviewed en


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