Body Mass Bias in a Competition of Muscle Strength and Aerobic PowerJournal of Strength and Conditioning Research
AbstractRecently, a fitness competition called the Pump and Run (PR) has been popularized. Composed of 2 events, a 5-km road race time (RT) in seconds and a maximal-repetition bench press (BPR) with resistance based on a percentage of body mass (M), the final score (RTadj) equals RT - 30(BPR). From published findings, the authors hypothesized that the PR would impose a bias against heavier competitors. Furthermore, the potential for age bias in this event has not been evaluated. Therefore, the purpose of this study was to investigate M and age bias in the PR for men and women. For 74 female and 343 male competitors in a large PR event, RT, BPR, M, and age were collected from official competition results. Two subsamples were randomly created from the original sample: the validation (VAL) (54 women and 258 men) and the cross-validation (CVAL) (20 women and 85 men). For the VAL sample, the RTadj showed significant bias against heavier runners (women r2 = 0.35; men r2 = 0.28;P < 0.01 for both) but no age bias (women r2 = 0.04; men r2 = 0.005; P > 0.05 for both). Using allometric modeling, the authors developed a set of M-based correction factors to be multiplied by each RTadj to yield new adjusted run times (NRTadj) that would be free of M bias. As applied to the CVAL sample, the NRTadj values virtually eliminated the M bias (women r2 = 0.04; men r2 = 0.002; P > 0.05 for both) of the current PR scoring system and retained the absence of age bias (women r2 = 0.02; men r2 = 0.0002; P > 0.05 for both). The authors recommend the use of the NRTadj scores for future PR competitions.
PublisherNational Strength and Conditioning Association
Citation InformationPaul M. Vanderburgh and Lloyd L. Laubach. "Body Mass Bias in a Competition of Muscle Strength and Aerobic Power" Journal of Strength and Conditioning Research Vol. 22 Iss. 2 (2008)
Available at: http://works.bepress.com/lloyd_laubach/5/