Abstract des Autors

Aim of the study was the comparison of the heart rate threshold (HRT) with a lactate turn point concept (LTP) and the threshold determined by electromyography (EMG AT) to validate the threshold concept introduced by CONCONI (3). 12 male and 7 female students (age: x = 23.7 +/- 3.5 yrs) performed an incremental exercise test on the cycle ergometer (modified CONCONI-test) from an initial work load of 20/40 (female/male) W to exhaustion by steps of 15/20 (female/male) W. HRT, LTP and EMG AT determination was done by microcomputer aided break point regression analysis. No significant differences (paired t-test, p<0.05) could be found between HRT (HR: x = 172.4 +/- 10.3 b/min; P: x = 194.2 +/- 45.3 W) nonlinear increase of integrated EMG (IEMG) (HR: x = 173.4 +/- 11.1 b/min; P: x = 196.1 +/- 46.5 W). Highly significant correlations (p<0.01) could be found between all threshold concepts for HR (HRT/LTP: 0.90; HRT/EMG AT: 0.73; LTP/EMG AT: 0.81) and for power output (HRT/LTP: 0.97; HRT/EMG AT: 0.95; LTP/EMG AT: 0.95). Both invasive and noninvasive threshold concepts lead to the same results and confirm previous studies. Verf.-Referat