Limited Benefit of Fat(max)-Test to Derive Training Prescriptions

作者：Schwindling S^*; Scharhag Rosenberger F; Kindermann W; Meyer T

来源：International Journal of Sports Medicine, 2014, 35(4): 280-285.

DOI：10.1055/s-0033-1349106

• fat metabolism
• fat oxidation
• indirect calorimetry
• intensity
• training
• cycling

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 different 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 [VO2max] of 50-60 ml/min/kg [ET]; n=8 with VO2max%26gt;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% VO2max. Heart rate and blood lactate were significantly different (p%26lt;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% VO2max. The precision and necessity of Fat(max)-tests for controlling the training of fat oxidation are therefore debatable.

• 出版日期2014-4