Does 1.5 mile Run Time & Body Mass Predict 8 Mile Loaded March Performance?

Research Paper Title

1.5 mile run time and body mass predict 8 mile loaded march performance, irrespective of sex.

Background

To develop a statistical model to predict 8 mile Loaded March (LM) performance and quantify differences in physical characteristics for men and women British Army Personnel.

Methods

135 trained soldiers (87 men; 48 women) completed two sessions, seven days apart.

  • Session 1: Participants’ stature, body mass, Fat Free Mass (FFM) [by dual-energy X-ray absorptiometry], Single Lift (SL), Water Can Carry (WCC), and 1.5 mile run performance were measured.
  • Session 2: Participants completed an 8 mile LM, carrying 25kg (4 miles paced and 4 miles individual best effort).

Sex differences were compared using independent samples t-tests and 8mile LM performance time was predicted using various multiple linear regression analysis: hierarchical forced entry multiple ordinary least squares, principal component and ordinary least products.

Results

A combination of 1.5mile run time and body mass were the strongest predictors of 8mile LM time (R2=0.71; SEE=4.17min; p<0.001). Including stature, FFM, sex, SL score, or WCC score did not further improve predictions (p>0.05). Compared to women, men had faster mean 1.5mile run and LM times, greater body mass and total FFM and higher SL and WCC scores (p<0.001), however some women outperformed men.

Conclusions

1.5 mile run time and body mass predict 8 mile LM performance with no further improvement gained in the model by including sex as a variable.

Reference

Coakley, S.L., Myers, S.D., Walker, E.F., Hale, B., Jackson, S., Greeves, J.P., Roberts, R. & Blacker, S.D. (2019) 1.5mile run time and body mass predict 8mile loaded march performance, irrespective of sex. Journal of Science and Medicine in Sport. 22(2), pp.217-221. doi: 10.1016/j.jsams.2018.07.007. Epub 2018 Jul 20.

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