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Purpose:

To identify the effect of allometric scaling on the relationship between running efficiency (REff) and middle-distancerunning performance according to performance level.

Methods:

Thirteen male recreational middle-distance runners (mean ± SD age 33.3 ± 8.4 y, body mass 76.4 ± 8.6 kg, maximal oxygen uptake [VO2max] 52.8 ± 4.6 mL · kg−1 · min−1; G1) and 13 male high-level middle-distance runners (age 25.5 ± 4.2 y, body mass 62.8 ± 2.7 kg, VO2max 70.4 ± 1.9 mL · kg−1 · min−1; G2) performed a continuous incremental test to volitional exhaustion to determine VO2max and a 6-min submaximal running test at 70% of VO2max to assess REff.

Results:

Significant correlation between REff and performance were found for both groups; however, the strongest correlations were observed in recreational runners, especially when using the allometric exponent (respectively for G1, nonallometric vs allometric scaling: r = .80 vs r = .86; and for G2, nonallometric vs allometric scaling: r = .55 vs r = .50).

Conclusion:

These results indicate that an allometric normalization may improve endurance-performance prediction from REff values in recreational, but not in elite, runners.

Tartaruga and Peyré-Tartaruga are with the Physical Education School, Federal University of Rio Grande do Sul, Porto Alegre, Brazil. Mota is with the School of Physical Education, Federal University of Santa Maria, Santa Maria, Brazil. Brisswalter is with the Human Motricity Laboratory of Sport Health Education, University of Nice Sophia Antipolis, Nice, France. Address author correspondence to Marcus Tartaruga at mtartaruga@hotmail.com.