Physiological responses during simulated 16 km recumbent handcycling time trial and determinants of performance in trained handcyclists.

PURPOSE

To characterise the physiological profiles of trained handcyclists, during recumbent handcycling, to describe the physiological responses during a 16 km time trial (TT) and to identify the determinants of this TT performance.

METHODS

Eleven male handcyclists performed a sub-maximal and maximal incremental exercise test in their recumbent handbike, attached to a Cyclus II ergometer. A physiological profile, including peak aerobic power output (PO), peak rate of oxygen uptake ([Formula: see text]O), aerobic lactate threshold (AeLT) and PO at 4 mmol L (PO), were determined. Participants also completed a 16 km simulated TT using the same experimental set-up. Determinants of TT performance were identified using stepwise multiple linear regression analysis.

RESULTS

Mean values of PO = 252 ± 9 W, [Formula: see text]O = 3.30 ± 0.36 L min (47.0 ± 6.8 mL kg min), AeLT = 87 ± 13 W and PO = 154 ± 14 W were recorded. The TT was completed in 29:21 ± 0:59 min:s at an intensity equivalent to 69 ± 4% PO and 87 ± 5% [Formula: see text]O. PO (r = - 0.77, P = 0.006), PO (r = - 0.77, P = 0.006) and AeLT (r = - 0.68, P = 0.022) were significantly correlated with TT performance. PO and PO were identified as the best predictors of TT performance (r = 0.89, P < 0.001).

CONCLUSION

PO, PO and AeLT are important physiological TT performance determinants in trained handcyclists, differentiating between superior and inferior performance, whereas [Formula: see text]O was not. The TT took place at an intensity corresponding to 69% PO and 87% [Formula: see text]O.