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European Journal of Applied Physiology

, Volume 115, Issue 4, pp 785–794 | Cite as

Effect of sauna-based heat acclimation on plasma volume and heart rate variability

  • Jamie StanleyEmail author
  • Aaron Halliday
  • Shaun D’Auria
  • Martin Buchheit
  • Anthony S. Leicht
Original Article

Abstract

Purpose

We investigated the effect of post-exercise sauna bathing on plasma volume (PV) expansion and whether such responses can be tracked by changes in heart rate (HR)-based measures.

Methods

Seven, well-trained male cyclists were monitored for 35 consecutive days (17 days baseline training, 10 days training plus sauna, 8 days training). Sauna exposure consisted of 30 min (87 °C, 11 % relative humidity) immediately following normal training. Capillary blood samples were collected while resting seated to assess PV changes. HR (HRwake) and vagal-related HR variability (natural logarithm of square root mean squared differences of successive R–R intervals, ln rMSSDwake) were assessed daily upon waking. A sub-maximal cycle test (5 min at 125 W) was performed on days 1, 8, 15, 22, 25, 29, and 35 and HR recovery (HRR60s) and ln rMSSDpostex were assessed post-exercise. Effects were examined using magnitude-based inferences.

Results

Compared with baseline, sauna resulted in: (1) peak PV expansion after four exposures with a likely large increase [+17.8 % (90 % confidence limits, 7.4; 29.2)]; (2) reduction of HRwake by a trivial-to-moderate amount [−10.2 % (−15.9; −4.0)]; (3) trivial-to-small changes for ln rMSSDwake [4.3 % (1.9; 6.8)] and ln rMSSDpostex [−2.4 % (−9.1; 4.9)]; and (4) a likely moderate decrease in HRR60s [−15.6 % (−30.9; 3.0)]. Correlations between individual changes in PV and HR measures were all unclear.

Conclusions

Sauna bathing following normal training largely expanded PV in well-trained cyclists after just four exposures. The utility of HR and HRV indices for tracking changes in PV was uncertain. Future studies will clarify mechanisms and performance benefits of post-training sauna bathing.

Keywords

Heat exposure Blood volume Cardiac parasympathetic activity Post-exercise Cyclists 

Abbreviations

CV

Coefficient of variation

ES

Effect size

Hb

Haemoglobin

Hct

Haematocrit

HR

Heart rate

HRex

Heart rate during the 5-min sub-maximal (125 W) exercise test

HRR

Heart rate recovery

HRR60s

Heart rate recovery at 60 s post-exercise

HRV

Heart rate variability

HRwake

Heart rate upon waking

ln rMSSDpostex

Natural logarithm of the rMSSD following sub-maximal exercise

ln rMSSDwake

Natural logarithm of the rMSSD upon waking

PV

Plasma volume

rMSSD

Square root mean of the sum of the squared differences between adjacent normal R–R intervals

SWC

Smallest worthwhile change

YoYoIR2

Yo-Yo Intermittent recovery level 2 test

Notes

Acknowledgments

The authors would like to thank the participants for their substantial commitment and assistance with the study. This study was funded by the Centre of Excellence for Applied Sport Science Research at the Queensland Academy of Sport. Aaron Halliday was supported by a scholarship from the Centre of Excellence for Applied Sport Science Research at Queensland Academy of Sport. Dr Jamie Stanley is supported by research grant funding from the Centre of Excellence for Applied Sport Science Research at Queensland Academy of Sport.

Conflict of interest

The remaining authors declare that they have no conflict of interest.

Ethical standard

The current experiment was conducted in Australia with all activities complying with the current laws of Australia.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Jamie Stanley
    • 1
    • 2
    Email author
  • Aaron Halliday
    • 3
  • Shaun D’Auria
    • 4
  • Martin Buchheit
    • 5
  • Anthony S. Leicht
    • 3
  1. 1.Centre of Excellence for Applied Sport Science ResearchQueensland Academy of SportBrisbaneAustralia
  2. 2.School of Human Movement StudiesUniversity of QueenslandBrisbaneAustralia
  3. 3.College of Healthcare SciencesJames Cook UniversityTownsvilleAustralia
  4. 4.Triathlon ProgramQueensland Academy of SportBrisbaneAustralia
  5. 5.Sport Science UnitMyorobie AssociationMontvalezanFrance

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