Physiological and performance adaptations to an in-season soccer camp in the heat: Associations with heart rate and heart rate variability

M. Buchheit, S. C. Voss, L. Nybo, M. Mohr, S. Racinais

Research output: Contribution to journalArticlepeer-review

117 Citations (Scopus)

Abstract

The aim of the present study was to examine the associations between adaptive responses to an in-season soccer
training camp in the heat and changes in submaximal
exercising heart rate (HRex, 5-min run at 9 km/h), postexercise HR recovery (HRR) and HR variability (HRV).
Fifteen well-trained but non-heat-acclimatized male adult
players performed a training week in Qatar (34.6 1.9°C
wet bulb globe temperature). HRex, HRR, HRV (i.e. the
standard deviation of instantaneous beat-to-beat R–R
interval variability measured from Poincaré plots SD1, a
vagal-related index), creatine kinase (CK) activity, plasma
volume (PV) changes, and post-5-min run rate of perceived exertion (RPE) were collected at six occasions in
temperate environmental conditions (22°C). Players also
performed the yo-yo intermittent recovery test level 1
(Yo-Yo IR1) in the same environmental conditions (22°C),
both at the beginning and at the end of the training week.
Throughout the intervention, HRex and HRV showed
decreasing (P < 0.001) and increasing (P < 0.001) trends,
respectively, while HRR remained unaffected (P = 0.84).
Changes in HRex [-0.52, 90% confidence limits (-0.64;
-0.38), P < 0.001] and SD1 [0.35 (0.19; 0.49), P < 0.001]
were correlated with those in PV. There was no change in
RPE (P = 0.92), while CK varied according to training
contents (P < 0.001), without association with HR-derived
measures. Yo-Yo IR1 performance increased by 7 9%
(P = 0.009), which was correlated with changes in HRex
[-0.64 (-0.84; -0.28), P = 0.01]. In conclusion, we found
that an in-season soccer training camp in the heat can
significantly improve PV and soccer-specific physical performance; both of which are associated with changes in
HRex during a 5-min submaximal run.
Original languageEnglish
Pages (from-to)e477-e485
JournalScandinavian Journal of Medicine & Science in Sports
Volume21
Issue number6
DOIs
Publication statusPublished - 2011

Keywords

  • heart rate recovery
  • submaximal running test
  • plasma volume
  • creatine kinase
  • heat acclimation
  • football

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