The effect of body mass on load carriage performance in a hot environment.

Simms, Andrew (2017) The effect of body mass on load carriage performance in a hot environment. Undergraduate thesis, University of Chichester.

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Abstract

The ability to carry load is a requirement for military personnel. Lighter individuals are often disadvantaged compared to their heavier counterparts during load carriage. When exercising in hot environments individuals with a larger Body Surface Area (BSA) are more able to dissipate heat more effectively. The interaction of load carriage performance in hot and cool conditions between individuals of different body sizes has not been examined. The aim of this study is to investigate the effect body size has on an individual’s ability to carry load in cool and hot environments. Method - Eight male (means±SD; Age 20±1 Years, stature 176.26±4.32 cm, Body mass (Bm) 71.31±10.25kg, BSA 1.85±0.14 m2) volunteered. Participants completed four separate conditions: cool Unloaded (CUn), Cool with Load Carriage (CLC), Hot Unloaded (HUn) and, lastly, Hot with Load Carriage (HLC). In the loaded conditions participants wore a 15 kg weighted vest. The hot condition was performed in 40°C heat with a relative humidity level of 30% and cool condition a temperature of 13°C with a relative humidity level of 80%. In each test condition participants walked on a treadmill at 6.5km·h-1 for ten minutes, the last two minutes of which expired air was collected in a Douglas bag. After a two-minute rest, participants completed a 2.4km best effort run and Performance time (Pt) was recorded. Heart Rate (HR), deep body temperature (Tc), skin temperature (Tski) and speed were recorded at the start and end of both the walk and run. Data Analysis – Data analysed using a two-way-repeated-measure ANOVA with an effect size calculation, with follow up t-test. Pearsons Correlations were made to investigate BSA/Bm and Pt. Results – Significant increases in Pt were seen for both temperature (p=0.001) and loading (p=0.001) main effects. A significant increase in end walking HR were seen for both temperature (p=0.015) and loading (p=0.011) main effects; and both temperature (p=0.027) and loading (p=0.018) for walking HR delta main effects. A significant increase in end of run HR for temperature (p=0.005) main effect. A significant interaction was seen for delta running Tc (p=0.010). Follow up t-tests showed significant increases from CUn-HCL (p=0.001) and CLC-HCL (p=0.001). Conclusion – Environmental temperature and load had combined effects on physical performance.

Item Type: Thesis (Undergraduate)
Additional Information: BSc (Hons) Sport and Exercise Science
Subjects: Q Science > Q Science (General)
Divisions: Departments > Sport and Exercise Sciences
Undergraduate Dissertations
Depositing User: Ann Jones
Date Deposited: 21 Sep 2017 14:53
Last Modified: 21 Sep 2017 14:53
URI: http://eprints.chi.ac.uk/id/eprint/3027

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