Utility of the W_BAL model in training programme design for masters cyclists

The present study aims to determine the utility of integrating balance model (W'(BAL_INT)) in designing interval training programmes as assessed by improvements in power output, critical power (CP), and W prime (W) defined as the finite work capacity above CP. Fourteen male cyclists (age = 42 +/- 7 yr, body mass = 69.6 +/- 6.5 kg, height = 175 +/- 5 cm, CP = 302 +/- 32 W, relative CP = 4.35 +/- 0.66 W.kg(-1)) were randomized into two training groups: Short-Medium-Long intervals (SML-INT; n = 7) or Long intervals (L-INT, n = 7) [training sessions separated by 72 h], along with 3-4 sessions of moderate intensity training per week, for 4 weeks. All sessions were designed to result in the complete depletion of the W' as gauged by the W-BAL_INT. CP and W' were assessed using the specified efforts (i.e. 12, 7 and 3 min) and calculated with the 2-parameter CP linear model. Training loads between the groups were compared using different metrics. CP improved in both the SML-INT and L-INT groups by 5 +/- 4% and 6 +/- 5% (p < 0.001) respectively, without significant changes in W. Mean maximal power over 3, 7 and 12 min increased significantly in the SML-INT group by 5%, 4% and 9%, (p < 0.05) without significant changes in the L-INT group. There were no differences between groups in training zone distribution or training load using BikeScore and relative intensity, but there was significantly (p < 0.05) higher TRIMPS for the Long-INT group. Therefore, W'(BAL) model may prove to be a useful tool for coaches to construct SML-INT training programmes.