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A heat acclimation protocol for team sports.
Br J Sports Med. 2008 May; 42(5):327-33.BJ

Abstract

BACKGROUND

It is well documented that heat acclimation of six or more sessions of at least 60 min duration prolongs the time to exhaustion during endurance walking, cycling and running in the heat. However, this type of acclimation is not specific to team sport activity and the effect of acclimation on prolonged high-intensity intermittent running has not yet been investigated.

OBJECTIVE

To assess the impact of an intermittent acclimation protocol on distance run during team sport activity.

METHODS

The impact of four short heat acclimation sessions (30-45 min of the Loughborough Intermittent Shuttle Test; LIST) on high-intensity intermittent running capacity (LIST) in the heat (30 degrees C, 27% relative humidity (RH)), was examined. Seventeen female well-trained games players were split into three groups: an acclimation group (30 degrees C, 24% RH), a moderate training group (18 degrees C, 41% RH) and a control group who did not complete any training between the main trials (pre-acclimation and post-acclimation). The pre-acclimation (A) and post-acclimation (B) trials were separated by 28 days to control for menstrual phase and verified using hormonal analysis. The four acclimation or moderate training sessions utilising the LIST were completed with one or two rest days interspersed between each session in a 10-day period prior to the post-acclimation trial (B).

RESULTS

In the post-acclimation trial distance run was increased by 33% in the acclimation group (A: 7703 (SEM 1401) m vs B: 10215 (SEM 1746) m; interaction group x trial p<0.05), but was unchanged in the moderate and control groups. The acclimation group had a lower rectal temperature (interaction group x trial x time p<0.01) due to a lower rate of rise, and an increase in thermal comfort1 after acclimation (End A: 7 (SEM 2) vs 6 (SEM 2); interaction group x trial p<0.01). There was no difference in serum progesterone, aldosterone or cortisol concentrations following acclimation or between groups.

CONCLUSION

Four 30-45 min sessions of intermittent exercise induced acclimation, and resulted in an improvement in intermittent running exercise capacity in female games players. A lower rectal temperature and a concomitant rise in thermal comfort may be partly responsible for the improvement in exercise capacity.

Authors+Show Affiliations

School of Biomedical and Natural Sciences, Nottingham Trent University, Clifton Lane, Nottingham, NG11 8NS, UK. caroline.sunderland@ntu.ac.ukNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18460609

Citation

Sunderland, C, et al. "A Heat Acclimation Protocol for Team Sports." British Journal of Sports Medicine, vol. 42, no. 5, 2008, pp. 327-33.
Sunderland C, Morris JG, Nevill ME. A heat acclimation protocol for team sports. Br J Sports Med. 2008;42(5):327-33.
Sunderland, C., Morris, J. G., & Nevill, M. E. (2008). A heat acclimation protocol for team sports. British Journal of Sports Medicine, 42(5), 327-33. https://doi.org/10.1136/bjsm.2007.034207
Sunderland C, Morris JG, Nevill ME. A Heat Acclimation Protocol for Team Sports. Br J Sports Med. 2008;42(5):327-33. PubMed PMID: 18460609.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A heat acclimation protocol for team sports. AU - Sunderland,C, AU - Morris,J G, AU - Nevill,M E, PY - 2008/5/8/pubmed PY - 2008/6/17/medline PY - 2008/5/8/entrez SP - 327 EP - 33 JF - British journal of sports medicine JO - Br J Sports Med VL - 42 IS - 5 N2 - BACKGROUND: It is well documented that heat acclimation of six or more sessions of at least 60 min duration prolongs the time to exhaustion during endurance walking, cycling and running in the heat. However, this type of acclimation is not specific to team sport activity and the effect of acclimation on prolonged high-intensity intermittent running has not yet been investigated. OBJECTIVE: To assess the impact of an intermittent acclimation protocol on distance run during team sport activity. METHODS: The impact of four short heat acclimation sessions (30-45 min of the Loughborough Intermittent Shuttle Test; LIST) on high-intensity intermittent running capacity (LIST) in the heat (30 degrees C, 27% relative humidity (RH)), was examined. Seventeen female well-trained games players were split into three groups: an acclimation group (30 degrees C, 24% RH), a moderate training group (18 degrees C, 41% RH) and a control group who did not complete any training between the main trials (pre-acclimation and post-acclimation). The pre-acclimation (A) and post-acclimation (B) trials were separated by 28 days to control for menstrual phase and verified using hormonal analysis. The four acclimation or moderate training sessions utilising the LIST were completed with one or two rest days interspersed between each session in a 10-day period prior to the post-acclimation trial (B). RESULTS: In the post-acclimation trial distance run was increased by 33% in the acclimation group (A: 7703 (SEM 1401) m vs B: 10215 (SEM 1746) m; interaction group x trial p<0.05), but was unchanged in the moderate and control groups. The acclimation group had a lower rectal temperature (interaction group x trial x time p<0.01) due to a lower rate of rise, and an increase in thermal comfort1 after acclimation (End A: 7 (SEM 2) vs 6 (SEM 2); interaction group x trial p<0.01). There was no difference in serum progesterone, aldosterone or cortisol concentrations following acclimation or between groups. CONCLUSION: Four 30-45 min sessions of intermittent exercise induced acclimation, and resulted in an improvement in intermittent running exercise capacity in female games players. A lower rectal temperature and a concomitant rise in thermal comfort may be partly responsible for the improvement in exercise capacity. SN - 1473-0480 UR - https://www.unboundmedicine.com/medline/citation/18460609/A_heat_acclimation_protocol_for_team_sports_ L2 - http://bjsm.bmj.com/cgi/pmidlookup?view=long&amp;pmid=18460609 DB - PRIME DP - Unbound Medicine ER -