Effect of Permissive Dehydration on Induction and Decay of Heat Acclimation, and Temperate Exercise Performance.

Authors: Neal, R.A., Massey, H.C., Tipton, M.J., Young, J.S. and Corbett, J.

Journal: Front Physiol

Volume: 7

Pages: 564

ISSN: 1664-042X

DOI: 10.3389/fphys.2016.00564

Abstract:

Purpose: It has been suggested that dehydration is an independent stimulus for heat acclimation (HA), possibly through influencing fluid-regulation mechanisms and increasing plasma volume (PV) expansion. There is also some evidence that HA may be ergogenic in temperate conditions and that this may be linked to PV expansion. We investigated: (i) the influence of dehydration on the time-course of acquisition and decay of HA; (ii) whether dehydration augmented any ergogenic benefits in temperate conditions, particularly those related to PV expansion. Methods: Eight males [VO2max: 56.9(7.2) mL·kg-1·min-1] undertook two HA programmes (balanced cross-over design), once drinking to maintain euhydration (HAEu) and once with restricted fluid-intake (HADe). Days 1, 6, 11, and 18 were 60 min exercise-heat stress tests [HST (40°C; 50% RH)], days 2-5 and 7-10 were 90 min, isothermal-strain (Tre ~ 38.5°C), exercise-heat sessions. Performance parameters [VO2max, lactate threshold, efficiency, peak power output (PPO)] were determined pre and post HA by graded exercise test (22°C; 55%RH). Results: During isothermal-strain sessions hypohydration was achieved in HADe and euhydration maintained in HAEu [average body mass loss -2.71(0.82)% vs. -0.56(0.73)%, P < 0.001], but aldosterone concentration, power output, and cardiovascular strain were unaffected by dehydration. HA was evident on day 6 {reduced end-exercise Tre [-0.30(0.27)°C] and exercise heart rate [-12(15) beats.min-1], increased PV [+7.2(6.4)%] and sweat-loss [+0.25(0.22) L.h-1], P < 0.05} with some further adaptations on day 11 {further reduced end-exercise Tre [-0.25(0.19)°C] and exercise heart rate [-3(9) beats.min-1], P < 0.05}. These adaptations were not notably affected by dehydration and were generally maintained 7-days post HA. Performance parameters were unchanged, apart from increased PPO (+16(20) W, irrespective of condition). Conclusions: When thermal-strain is matched, permissive dehydration which induces a mild, transient, hypohydration does not affect the acquisition and decay of HA, or endurance performance parameters. Irrespective of hydration, trained individuals require >5 days to optimize HA.

http://eprints.bournemouth.ac.uk/29701/

Source: PubMed

Effect of Permissive Dehydration on Induction and Decay of Heat Acclimation, and Temperate Exercise Performance

Authors: Neal, R.A., Massey, H.C., Tipton, M.J., Young, J.S. and Corbett, J.

Journal: FRONTIERS IN PHYSIOLOGY

Volume: 7

ISSN: 1664-042X

DOI: 10.3389/fphys.2016.00564

http://eprints.bournemouth.ac.uk/29701/

Source: Web of Science (Lite)

Effect of permissive dehydration on induction and decay of heat acclimation, and temperate exercise performance

Authors: Rendell, R., Massey, H., Tipton, M., Young, J. and Corbett, J.

Journal: Frontiers in Physiology

Publisher: Frontiers Media

ISSN: 1664-042X

http://eprints.bournemouth.ac.uk/29701/

Source: Manual

Effect of Permissive Dehydration on Induction and Decay of Heat Acclimation, and Temperate Exercise Performance.

Authors: Neal, R.A., Massey, H.C., Tipton, M.J., Young, J.S. and Corbett, J.

Journal: Frontiers in physiology

Volume: 7

Pages: 564

eISSN: 1664-042X

ISSN: 1664-042X

DOI: 10.3389/fphys.2016.00564

Abstract:

Purpose: It has been suggested that dehydration is an independent stimulus for heat acclimation (HA), possibly through influencing fluid-regulation mechanisms and increasing plasma volume (PV) expansion. There is also some evidence that HA may be ergogenic in temperate conditions and that this may be linked to PV expansion. We investigated: (i) the influence of dehydration on the time-course of acquisition and decay of HA; (ii) whether dehydration augmented any ergogenic benefits in temperate conditions, particularly those related to PV expansion. Methods: Eight males [VO2max: 56.9(7.2) mL·kg-1·min-1] undertook two HA programmes (balanced cross-over design), once drinking to maintain euhydration (HAEu) and once with restricted fluid-intake (HADe). Days 1, 6, 11, and 18 were 60 min exercise-heat stress tests [HST (40°C; 50% RH)], days 2-5 and 7-10 were 90 min, isothermal-strain (Tre ~ 38.5°C), exercise-heat sessions. Performance parameters [VO2max, lactate threshold, efficiency, peak power output (PPO)] were determined pre and post HA by graded exercise test (22°C; 55%RH). Results: During isothermal-strain sessions hypohydration was achieved in HADe and euhydration maintained in HAEu [average body mass loss -2.71(0.82)% vs. -0.56(0.73)%, P < 0.001], but aldosterone concentration, power output, and cardiovascular strain were unaffected by dehydration. HA was evident on day 6 {reduced end-exercise Tre [-0.30(0.27)°C] and exercise heart rate [-12(15) beats.min-1], increased PV [+7.2(6.4)%] and sweat-loss [+0.25(0.22) L.h-1], P < 0.05} with some further adaptations on day 11 {further reduced end-exercise Tre [-0.25(0.19)°C] and exercise heart rate [-3(9) beats.min-1], P < 0.05}. These adaptations were not notably affected by dehydration and were generally maintained 7-days post HA. Performance parameters were unchanged, apart from increased PPO (+16(20) W, irrespective of condition). Conclusions: When thermal-strain is matched, permissive dehydration which induces a mild, transient, hypohydration does not affect the acquisition and decay of HA, or endurance performance parameters. Irrespective of hydration, trained individuals require >5 days to optimize HA.

http://eprints.bournemouth.ac.uk/29701/

Source: Europe PubMed Central

Effect of permissive dehydration on induction and decay of heat acclimation, and temperate exercise performance

Authors: Neal, R., Massey, H., Tipton, M., Young, J. and Corbett, J.

Journal: Frontiers in Physiology

Volume: 7

ISSN: 1664-042X

Abstract:

Purpose: It has been suggested that dehydration is an independent stimulus for heat 32 acclimation (HA), possibly through influencing fluid-regulation mechanisms and increasing 33 plasma volume (PV) expansion. There is also some evidence that HA may be ergogenic in 34 temperate conditions and that this may be linked to PV expansion. We investigated: i) the 35 influence of dehydration on the time-course of acquisition and decay of HA; ii) whether 36 dehydration augmented any ergogenic benefits in temperate conditions, particularly those related to PV expansion. Methods: Eight males (VO2max: 56.9(7.2) mL·kg-1 ·min-1 37 ) undertook 38 two HA programmes (balanced cross-over design), once drinking to maintain euhydration 39 (HAEu) and once with restricted fluid-intake (HADe). Days 1, 6, 11 and 18 were 60 min exercise- 40 heat stress tests (HST [40°C; 50%RH]), days 2-5 and 7-10 were 90 min, isothermal-strain 41 (Tre~38.5°C), exercise-heat sessions. Performance parameters (VO2max, lactate threshold, 42 efficiency, peak power output [PPO]) were determined pre and post HA by graded exercise test 43 (22°C; 55 %RH). Results: During isothermal-strain sessions hypohydration was achieved in 44 HADe and euhydration maintained in HAEu (average body mass loss -2.71(0.82)% vs. - 45 0.56(0.73)%, P<0.001), but aldosterone concentration, power output and cardiovascular strain 46 were unaffected by dehydration. HA was evident on day 6 (reduced end-exercise Tre [- 0.30°C(0.27)] and exercise heart rate [-12(15) beats.min-1 47 ], increased PV [+7.2(6.4)%] and sweat-loss [+0.25(0.22) L.hr-1 48 ], P<0.05) with some further adaptations on day 11 (further reduced end-exercise Tre [-0.25(0.19)°C] and exercise heart rate [-3(9) beats.min-1 49 ], P<0.05).

50 These adaptations were not notably affected by dehydration and were generally maintained 7- 51 days post HA. Performance parameters were unchanged, apart from increased PPO (+16(20) 52 W, irrespective of condition). Conclusions: When thermal-strain is matched, permissive 53 dehydration which induces a mild, transient, hypohydration does not affect the acquisition and 54 decay of HA, or endurance performance parameters. Irrespective of hydration, trained 55 individuals require >5 days to optimise HA.

http://eprints.bournemouth.ac.uk/29701/

Source: BURO EPrints