Purpose:
The objective of this study was to determine the relationships of peak oxygen uptake (VO_2peak), power at VO_2peak and power at the anaerobic threshold (AT) with national ranking in a sample of British high performance junior surfers.

Methods:
Eighteen male surfers (aged 15.4 ± 1.4 years) from the British Junior Surfing team were tested for VO_2peak and AT using an adapted kayak ergometer; national ranking was used to indicate performance level. The AT was identified as the point at which VE/ VO₂ started to rise without a concomitant increase in E/VCO₂. Spearman’s rank (r_s) and partial correlations (r_p) controlling for age were used to identify the relationships between the physiological variables and national ranking.

Results:
Mean VO_2peak was 3.1 ± 0.5 l • min–1 (47.7 ± 7.2 ml • kg–1 • min–1) and mean AT occurred at 48.1 ± 12.2 W. There were significant correlations between national ranking and power at VO_2peak (r_s = –0.549, p = 0.028), power at AT (r_s = –0.646, p = 0.009), and age (r_s = –0.579, p = 0.012). Significant partial correlations were established controlling for age between national ranking and power at VO_2peak (r_p = –0.839, p = 0.000) and power at AT (r_p = –0.541, p < 0.046).

Conclusions:
The power outputs associated with VO_2peak and AT were significantly related to surfer ranking in this sample. However, due to the low coefficient of determination associated with the AT/ranking relationship, AT does not discriminate well between the ranking of surfers. These findings support the inclusion of power at VO_2peak in assessment batteries for junior competitive surfers.