TY - JOUR AU - Blokland, Ilse Johanna; de Koning, Jos J.; van Kan, Thomas; van Bennekom, Coen A. M.; van Dieen, Jaap H.; Houdijk, Han TI - Estimation of Metabolic Energy Expenditure during Short Walking Bouts SN - 0172-4622 SN - 1439-3964 PY - 2021 JO - Int J Sports Med JF - International Journal of Sports Medicine LA - EN VL - 42 IS - 12 SP - 1098 EP - 1104 DA - 2021/04/16 KW - oxygen uptake KW - oxygen uptake kinetics KW - steady state KW - test-retest reliability KW - aerobic load KW - validity AB - Assessment of metabolic energy expenditure from indirect calorimetry is currently limited to sustained (>4 min) cyclic activities, because of steady-state requirements. This is problematic for patient populations who are unable to perform such sustained activities. Therefore, this study explores validity and reliability of a method estimating metabolic energy expenditure based on oxygen consumption (V̇O2) during short walking bouts. Twelve able-bodied adults twice performed six treadmill walking trials (1, 2 and 6 min at 4 and 5 km/h), while V̇O2 was measured. Total V̇O2 was calculated by integrating net V̇O2 over walking and recovery. Concurrent validity with steady-state V̇O2 was assessed with Pearson’s correlations. Test-retest reliability was assessed using intra-class correlation coefficients (ICC) and Bland-Altman analyses. Total V̇O2 was strongly correlated with steady-state V̇O2 (r=0.91–0.99), but consistently higher. Test-retest reliability of total V̇O2 (ICC=0.65–0.92) was lower than or comparable to steady-state V̇O2 (ICC=0.83–0.92), with lower reliability for shorter trials. Total V̇O2 discriminated between gait speeds. Total oxygen uptake provides a useful measure to estimate metabolic load of short activities from oxygen consumption. Although estimates are less reliable than steady-state measurements, they can provide insight in the yet unknown metabolic demands of daily activities for patient populations unable to perform sustained activities. PB - Georg Thieme Verlag KG DO - 10.1055/a-1373-5770 UR - http://www.thieme-connect.de/products/ejournals/abstract/10.1055/a-1373-5770 ER -