Effects of swimming training on aerobic capacity and exercise induced bronchoconstriction in children with bronchial asthma
a Division of
Pediatrics, National Minami Fukuoka Chest Hospital, b Laboratory of Exercise Physiology, School of
Physical Education, c Fukuoka University, 45-1-7 Nanakuma, Fukuoka 814-0180, Japan
Correspondence to: Dr I Matsumoto.
Received 3 September 1997; Returned to authors 26 November 1997; Revised version received 18 November 1998; Accepted for publication 7 December 1998
BACKGROUND
A study was
undertaken to determine whether swimming training improved aerobic
capacity, exercise induced bronchoconstriction (EIB), and bronchial
responsiveness to inhaled histamine in children with asthma.
METHODSEight children
with mild or moderate asthma participated in swimming training every
day for six weeks. The intensity of training was individually
determined and set at 125% of the child's lactate threshold (LT),
measured using a swimming ergometer. Another group of eight asthmatic
children served as control subjects. Aerobic capacity and the degree of
EIB were assessed by both cycle ergometer and swimming ergometer
before and after swimming training.
RESULTSThe mean (SD)
aerobic capacity at LT increased by 0.26 (0.11) kp after training when
assessed with the swimming ergometer and by 10.6 (4.5) W when assessed
with the cycle ergometer, and these changes were significantly
different from the control group. The mean (SD) maximum % fall in
forced expiratory volume in one second (FEV1) to an
exercise challenge (cycle ergometer) set at 175% of LT decreased from
38.7 (15.4)% before training to 17.9 (17.6)% after training, but with
no significant difference from the control group. There was, however,
no difference in histamine responsiveness when compared before and
after the training period.
CONCLUSIONA six week
swimming training programme has a beneficial effect on aerobic capacity
but not on histamine responsiveness in children with asthma.
© 1999 by Thorax
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