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Copies of author's previously published articles inserted. Bibliography: leaves 172-204. H-relexes are used to determine the reflex connections of muscle spindle afferents, the exitability of the motorneuron pool and the integrity of the reflex pathways. However, H-relexes are small and can be difficult to elicit in the masseter, limiting their use in the investigation of the masticatory system. This study investigated the recruitment of masseter motorneurons into the H-reflex, compared to the recruitment occuring during voluntary isometric biting, to determine the distribution of the effective muscle spindle input.

Copies of author's previously published articles inserted. / Bibliography: leaves 172-204. / xi, 211 leaves : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / H-relexes are used to determine the reflex connections of muscle spindle afferents, the exitability of the motorneuron pool and the integrity of the reflex pathways. However, H-relexes are small and can be difficult to elicit in the masseter, limiting their use in the investigation of the masticatory system. This study investigated the recruitment of masseter motorneurons into the H-reflex, compared to the recruitment occuring during voluntary isometric biting, to determine the distribution of the effective muscle spindle input. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physiology, 1999

Copies of author's previously published articles inserted. / Bibliography: leaves 121-137. / ix, 138 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Investigates the pattern of reflexes evoked by stretch in a human jaw-closing muscle (masseter) at the level of the whole muscle and individual motor units. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physiology, 1994

The purpose of this study was to evaluate muscle oxygenation, cardiorespiratory, and blood lactate responses to an acute bout of a high-intensity interval training (HIIT) bodyweight squat protocol (HIIT-squats) in comparison to (continuous) moderate intensity cycling exercise (MOD). On separate days, within a two week period, 15 recreationally active males (28 (4.6) years) performed: 1) incremental test to exhaustion on a cycle ergometer, 2) 30-minutes of moderate intensity cycling (MOD; 65% VO2max), and 3) HIIT-squats consisting of eight x 20 seconds of bodyweight squats performed at maximal cadence with 10-s rest intervals. During each exercise condition, oxygen consumption (VO2) and heart rate were monitored continuously, and muscle oxygenation (tissue saturation index, TSI) at the left vastus lateralis muscle was measured for 2 minutes pre-, throughout, and for 5 minutes post-exercise using Near-Infrared Spectroscopy (NIRS; Portalite, Artinis Medical Systems, Netherlands). Blood lactate was measured at pre- and one, three, and five minutes post-exercise. Mean and peak changes in TSI were similar in both HIIT-squats (mean = -14.6 (5.3)%, peak = -19.7 (5.2)%; p > 0.05) and MOD (mean = -13.2 (5.6)%, peak = -18.2 (7.6)%; p > 0.05), with peak changes in TSI occurring significantly faster in HIIT-squats (71.2 (95.2) seconds (s) after onset of exercise) than in MOD (1452.9 (647.8)s; p < 0.05). The half time of TSI recovery following HIIT-squats (T1/2TSI = 25 (7.9)s) was not significantly different post-MOD (25 (9.6)s). Mean VO2 during HIIT-squats (31.48 (4.58) ml.kg-1.min-1) was similar to MOD (33.76 (5.71) ml.kg-1.min-1), however minute ventilation (VE), respiratory exchange ratio (RER) and all post-exercise blood lactate concentrations were significantly higher in HIIT-squats compared to MOD (p < 0.05). Despite the different durations of HIIT-squats and MOD, mean and peak changes in aerobic metabolism during and after exercise were similar. Results provide evidence of both aerobic and anaerobic contributions to energy metabolism in response to HIIT-squats, and highlight possible mechanisms for the commonly reported improvements in aerobic power following chronic HIIT. / Graduate / akates@uvic.ca

published_or_final_version / Physiology / Doctoral / Doctor of Philosophy