Medicine & Science in Sports &
May 2003 - Volume 35 -
Issue 5 - p S162
Communication/Poster Altitude Effects/Hyperbaria
1University of Wolverhampton, Gorway Road,
Walsall, WSI 3BD
A.M.Lane2@wlv.ac.uk (Sponsor: Alan Batterham, FACSM)
Evidence suggests exercising in hypoxia can produce a
stress response, characterized by increased negative mood, and
relatively poor performance. Lane and Terry 2000) suggested that
depressed mood is the most influential mood dimension, and that
individuals reporting it tend also to report mood disturbance.
To investigate: 1) mood changes during a two-hour
cycling test during hypoxic and normoxic conditions, and 2) mood
dynamics that lead to depressed mood.
Eight volunteer male elite cyclists performed two
50-mile cycle bouts on a cycle ergometer. Trials were randomly assigned
from normobaric normoxia and normobaric hypoxia (2,500 metres), and were
separated by two weeks. Both cycle bouts were performed at an intensity
equivalent to lactate threshold. Mood was assessed before, after one
hour, after two hours and on completion of the 50 mile ride using the
24-item Brunel Mood Scale.
Repeated measures ANOVA (time × condition) results
showed that fatigue increased significantly more at altitude than at sea
level(F 1,7 = 5.73, p < .05, Eta2 = .45). Other unpleasant mood
states also increased more during the hypoxic condition than the
normoxic condition. Effects were moderate, although not statistically
significant, for anger (Eta2 = .36), confusion (Eta2 = .24), depression
(Eta2 = .29), and tension (Eta2 = .31). Vigor scores decreased more
during the altitude ride (Eta2 = .25). An examination of mood dynamics
indicated that increases in depressed mood followed an exponential
increase in fatigue, rather than the other way around, and that once
depressed mood was activated it was associated with increased anger,
confusion, and tension and reduced vigor.
Findings lend support to the notion that, compared to
sea level, performing intense exercise at altitude is associated with
greater mood disturbance. Future research should investigate the
interplay between mood dynamics and the type of coping strategies used
by athletes during intense exercise.