Limited Benefit of Fat max -Test to Derive Training Prescriptions.

Autor: Schwindling, S., Scharhag-Rosenberger, F., Kindermann, W., Meyer, T.
Předmět:
Zdroj: International Journal of Sports Medicine; Apr2014, Vol. 35 Issue 4, p280-285, 6p, 3 Charts, 2 Graphs
Abstrakt: The intensity that elicits maximal fat oxidation (Fat max) is recommended for training fat metabolism. However, it remains unclear whether Fat max leads to the highest fat oxidation rates during prolonged exercise. It was hypothesized that there are no differences in fat oxidation rates among 3 diff rent exercise intensities. Therefore, fat metabolism was compared among 1-h constant load tests at Fat max , a higher and a lower intensity. A cohort of 16 male cyclists (28 ± 6 yrs, BMI: 22.5 ± 1.2 kg/m 2 ; n = 8 with maximal oxygen uptake [VO 2max ] of 50-60 ml/min/kg [ET]; n = 8 with VO 2max > 60 ml/min/kg [HET]) completed a maximal incremental cycling test, a submaximal incremental Fat max -test and, thereafter, three 1-h constant-load tests in randomized order at Fat max, one exercise stage below (LOW) and one above (HIGH). LOW, Fat max and HIGH were performed at 52 ± 13, 60 ± 13 and 70 ± 12 % VO 2maxx . Heart rate and blood lactate were significantly different (p < 0.001). However, the fat oxidation rate showed no difference (p = 0.61). This was also true within each subgroup (ET: p = 0.69, HET p = 0.61). In conclusion, the fat oxidation rate of endurance trained cyclists shows no difference between 1-h constant load exercise bouts at about 50-70 % VO 2max . The precision and necessity of Fatmax-tests for controlling the training of fat oxidation are therefore debatable. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
Externí odkaz: