TY - JOUR T1 - Lactemia in the evaluation of exercise JF - European Respiratory Journal JO - Eur Respir J VL - 42 IS - Suppl 57 SP - P3697 AU - Regina Monteiro AU - Sérgio Campainha AU - Ivone Pascoal AU - Miguel Guimarães AU - Natália Taveira Y1 - 2013/09/01 UR - http://erj.ersjournals.com/content/42/Suppl_57/P3697.abstract N2 - Introduction: Chronic respiratory patients tend to reduce physical activity due to dyspnea and muscle mass loss. Respiratory rehabilitation should include exercise training to break the deconditioning cycle.Aim: Compare serum lactate ([Lac]) with heart rate (HR) and Borg scale (BS) in the evaluation of exercise intensity.Methods: 21 chronic respiratory patients were submitted to 20 sessions of training on stationary bicycle. Each session included 4 peaks of 3 min with intensity above the anaerobic threshold (determined by cycle ergometer test). HR, peripheral saturation of O2 and 10 point BS were monitored in every training. [Lac] was determined after the first (1st) and last sessions.Results: Patients had 58 (+/-8,1) years and FEV1 of 48,1 (+/-16,9) %. FEV1 related to the maximum load (MaxL) determined by cycle ergometer test (ρ=0,503; p=0,02).In the 1st sessions the peak loads ranged from 30 to 80W (52-82% of MaxL); HR from 101 to 160bpm; BS from 0,5 to 9 and [Lac] from 2,1 to 9mmol/l. In the last sessions the peak loads ranged from 35 to 105W (61-122% of MaxL); HR from 103 to 148bpm; BS from 0 to 4 and [Lac] from 3 to 10mmol/l. The load related to the [Lac] both in the 1st (ρ=0,597; p=0,004) as in the last session (ρ=0,604; p=0,004). The association with HR was smaller and only in the 1st session (ρ =0,446; p=0,043). There was no association between the load and BS.Conclusion: The association of FEV1 and MaxL confirms the functional limitation of the respiratory patients. The relationship between [Lac] and the load performed shows its usefulness in the determination of exercise intensity, better than HR or BS. ER -