Determination and validation of peak fat oxidation in endurance-trained men using an upper body graded exercise test

TY - JOUR

T1 - Determination and validation of peak fat oxidation in endurance-trained men using an upper body graded exercise test

AU - Hansen, Mikkel Thunestvedt

AU - Romer, Tue

AU - Frandsen, Jacob

AU - Larsen, Steen

AU - Dela, Flemming

AU - Helge, Jorn Wulff

PY - 2019/11/1

Y1 - 2019/11/1

N2 - Peak fat oxidation rate (PFO) and the intensity that elicits PFO (Fat(max)) are commonly determined by a validated graded exercise test (GE) on a cycling ergometer with indirect calorimetry. However, for upper body exercise fat oxidation rates are not well elucidated and no protocol has been validated. Thus, our aim was to test validity and inter-method reliability for determination of PFO and Fat(max) in trained men using a GE protocol applying double poling on a ski-ergometer. PFO and Fat(max) were assessed during two identical GE tests (GE1 and GE2) and validated against separated short continuous exercise bouts (SCE) at 35%, 50%, and 65% of V?O-2peak on the ski-ergometer in 10 endurance-trained men (V?O-2peak: 65.1 +/- 1.0 mL center dot min(-1)center dot kg(-1), mean +/- SEM). Between GE tests no differences were found in PFO (GE1: 0.42 +/- 0.03; GE2: 0.45 +/- 0.03 g center dot min(-1), P = .256) or Fat(max) (GE1: 41 +/- 2%; GE2: 43 +/- 3% of V?O-2peak, P = .457) and the intra-individual coefficient of variation (CV) was 8 +/- 2% and 11 +/- 2% for PFO and Fat(max), respectively. Between GE and SCE tests, PFO (GE(avg): 0.44 +/- 0.03; SCE; 0.47 +/- 0.06 g center dot min(-1), P = .510) was not different, whereas a difference in Fat(max) (GE(avg): 42 +/- 2%; SCE: 52 +/- 4% of V?O-2peak, P = .030) was observed with a CV of 17 +/- 4% and 15 +/- 4% for PFO and Fat(max), respectively. In conclusion, GE has a high day-to-day reliability in determination of PFO and Fat(max) in trained men, whereas it is unclear if PFO and Fat(max) determined by GE reflect continuous exercise in general.

AB - Peak fat oxidation rate (PFO) and the intensity that elicits PFO (Fat(max)) are commonly determined by a validated graded exercise test (GE) on a cycling ergometer with indirect calorimetry. However, for upper body exercise fat oxidation rates are not well elucidated and no protocol has been validated. Thus, our aim was to test validity and inter-method reliability for determination of PFO and Fat(max) in trained men using a GE protocol applying double poling on a ski-ergometer. PFO and Fat(max) were assessed during two identical GE tests (GE1 and GE2) and validated against separated short continuous exercise bouts (SCE) at 35%, 50%, and 65% of V?O-2peak on the ski-ergometer in 10 endurance-trained men (V?O-2peak: 65.1 +/- 1.0 mL center dot min(-1)center dot kg(-1), mean +/- SEM). Between GE tests no differences were found in PFO (GE1: 0.42 +/- 0.03; GE2: 0.45 +/- 0.03 g center dot min(-1), P = .256) or Fat(max) (GE1: 41 +/- 2%; GE2: 43 +/- 3% of V?O-2peak, P = .457) and the intra-individual coefficient of variation (CV) was 8 +/- 2% and 11 +/- 2% for PFO and Fat(max), respectively. Between GE and SCE tests, PFO (GE(avg): 0.44 +/- 0.03; SCE; 0.47 +/- 0.06 g center dot min(-1), P = .510) was not different, whereas a difference in Fat(max) (GE(avg): 42 +/- 2%; SCE: 52 +/- 4% of V?O-2peak, P = .030) was observed with a CV of 17 +/- 4% and 15 +/- 4% for PFO and Fat(max), respectively. In conclusion, GE has a high day-to-day reliability in determination of PFO and Fat(max) in trained men, whereas it is unclear if PFO and Fat(max) determined by GE reflect continuous exercise in general.

KW - exercise testing

KW - Fat(max)

KW - lipid metabolism

KW - peak fat oxidation

KW - test reliability

KW - test validity

KW - upper body exercise

U2 - 10.1111/sms.13519

DO - 10.1111/sms.13519

M3 - Journal article

C2 - 31309617

SN - 0905-7188

JO - Scandinavian Journal of Medicine & Science in Sports

JF - Scandinavian Journal of Medicine & Science in Sports

ER -