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O2 kinetics during heavy exercise
are related to changes in muscle activity
1 Chelsea School Research Centre, University of Brighton, Eastbourne, East Sussex BN20 7SP; 2 Department of Sport and Exercise Science, University of Wales Aberystwyth, Aberystwyth, Ceredigion SY23 3DA; and 3 Department of Exercise and Sport Science, Manchester Metropolitan University, Alsager ST7 2HL, United Kingdom
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
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