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1 Faculty of Health Sciences, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada
2 Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
3 Faculty of Sciences, University of Ottawa, Ottawa, Ontario, Canada
4 Faculty of Health Sciences, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada; Human Protection and Performance, Defence R&D Canada, Toronto, Ontario, Canada
* To whom correspondence should be addressed. E-mail: gkenny{at}uottawa.ca.
Seven subjects performed an incremental isotonic test on a KIN-COMTM isokinetic apparatus to determine their maximal oxygen consumption during bilateral knee extensions (VO2sp). A multi-sensor thermal probe was inserted into the left vastus medialis (mid-diaphysis)under ultrasound guidance. The deepest temperature sensor (tip, Tmu10) was located ~10 mm equidistant from the femur and deep femoral artery with additional sensors located at 15 (Tmu25) and 30 (Tmu40) mm, respectively from the tip. Esophageal temperature (Tes) temperature was measured as an index of core temperature. Subjects rested in an upright seated position for 60 min in an ambient condition of 22°C. They then performed 15 min of isolated bilateral knee extensions (60% of VO2sp) on a KIN-COMTM followed by 60 min of seated recovery. Resting Tes was 36.80°C while Tmu10, Tmu25, and Tmu40 were 36.14, 35.86 and 35.01°C respectively. Exercise resulted in a Tes increase of 0.55°C above pre-exercise resting. The muscle temperature of the exercising leg increased by 2.09, 2.37 and 3.20°C for Tmu10, Tmu25, and Tmu40 respectively at the end of the exercise. Following cessation of exercise, Tes showed a rapid decrease followed by a prolonged sustained elevation 0.30°C above baseline resting. Muscle temperature decreased gradually over the course of recovery with values remaining significantly elevated by 0.92, 1.05 and 1.77°C for Tmu10, Tmu25 and Tmu40 respectively above baseline resting at end of recovery (p<0.05). These results suggest that the transfer of residual heat from previously active musculature may contribute to the sustained elevation in post-exercise esophageal temperature.
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