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Prior heavy-intensity exercise speeds O₂ kinetics during moderate-intensity exercise in young adults

¹Canadian Centre for Activity and Aging, ²School of Kinesiology, and ³Department of Physiology and Pharmacology, The University of Western Ontario London, Ontario, Canada; and ⁴Department of Kinesiology, The University of Toledo, Toledo, Ohio

Submitted 16 September 2004 ; accepted in final form 29 November 2004

The effect of prior heavy-intensity warm-up exercise on subsequent moderate-intensity phase 2 pulmonary O₂ uptake kinetics (O₂) was examined in young adults exhibiting relatively fast (FK; O₂ < 30 s; n = 6) and slow (SK; O₂ > 30 s; n = 6) O₂ kinetics in moderate-intensity exercise without prior warm up. Subjects performed four repetitions of a moderate (Mod₁)-heavy-moderate (Mod₂) protocol on a cycle ergometer with work rates corresponding to 80% estimated lactate threshold (moderate intensity) and 50% difference between lactate threshold and peak O₂ (heavy intensity); each transition lasted 6 min, and each was preceded by 6 min of cycling at 20 W. O₂ and heart rate (HR) were measured breath-by-breath and beat-by-beat, respectively; concentration changes of muscle deoxyhemoglobin (HHb), oxyhemoglobin, and total hemoglobin were measured by near-infrared spectroscopy (Hamamatsu NIRO 300). O₂ was lower (P < 0.05) in Mod₂ than in Mod₁ in both FK (20 ± 5 s vs. 26 ± 5 s, respectively) and SK (30 ± 8 s vs. 45 ± 11 s, respectively); linear regression analysis showed a greater "speeding" of O₂ kinetics in subjects exhibiting a greater Mod₁ O₂. HR, oxyhemoglobin, and total hemoglobin were elevated (P < 0.05) in Mod₂ compared with Mod₁. The delay before the increase in HHb was reduced (P < 0.05) in Mod₂, whereas the HHb mean response time was reduced (P < 0.05) in FK (Mod₂, 22 ± 3 s; Mod₁, 32 ± 11 s) but not different in SK (Mod₂, 36 ± 13 s; Mod₁, 34 ± 15 s). We conclude that improved muscle perfusion in Mod₂ may have contributed to the faster adaptation of O₂, especially in SK; however, a possible role for metabolic inertia in some subjects cannot be overlooked.

near-infrared spectroscopy; muscle deoxygenation; heart rate; muscle oxygen utilization; warm-up exercise

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