Predicting sickness during a 2-week soccer camp at 3600 m (ISA 3600)
Fecha
2013-08-23Autor
Buchheit, Martin
Simpson, Ben M
Schmidt, Walter F
Aughey, Robert J
Soria, Rudy
Hunt, Robert A
Garvican-Lewis, Laura A
Pyne, David B
Gore, Christopher J
Bourdon, Pitre C
Metadatos
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Abstract.
Objectives. To examine the time course of changes in
wellness and health status markers before and after
episodes of sickness in young soccer players during a
high-altitude training camp (La Paz, 3600 m).
Methods Wellness and fatigue were assessed daily on
awakening using specifically-designed questionnaires and
resting measures of heart rate and heart rate variability.
The rating of perceived exertion and heart rate responses
to a submaximal run (9 km/h) were also collected during
each training session. Players who missed the morning
screening for at least two consecutive days were
considered as sick.
Results Four players met the inclusion criteria. With
the exception of submaximal exercise heart rate, which
showed an almost certain and large increase before the
day of sickness (4%; 90% confidence interval 3 to 6),
there was no clear change in any of the other
psychometric or physiological variables. There was a very
likely moderate increase (79%, 22 to 64) in self-reported
training load the day before the heart rate increase in
sick players (4 of the 4 players, 100%). In contrast,
training load was likely and slightly decreased (−24%,
−78 to −11) in players who also showed an increased
heart rate but remained healthy.
Conclusions A >4% increased heart rate during
submaximal exercise in response to a moderate increase
in perceived training load the previous day may be an
indicator of sickness the next day. All other variables,
that is, resting heart rate, heart rate variability and
psychometric questionnaires may be less powerful at
predicting sickness.