The effects of exercise intensity using an identical workload on total haemoglobin count and oxygen saturation using near infrared spectroscopy.
University of Wales
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The purpose of the present study was to determine whether exercise intensity affects responses at a peripheral level despite an identical workload. As numerous relationships between peripheral and cardiovascular responses have been recognized, by identifying the optimal intensity for peripheral changes to occur, there is potential to infer chronic cardiovascular changes from beneficial training implications. Ten male subjects (mean ± SD: age 20.1 ± 0.64 years, height 179.63 ± 9.99 cm, weight 81.51 ± 10.98 kg) performed an initial ramp protocol followed by two individually prescribed exercise tests on three separate occasions using a cycle ergometer. Participants were active and healthy and were recruited from within the school of sport at the University of Wales Institute Cardiff (UWIC). Using near infrared spectroscopy (NIRS) on the Vastus Lateralis, total haemoglobin count (THC) (Um-micrometers) and oxygen saturation (%) were quantified. Findings for THC accept H1 (P<0.05) and for oxygen saturation accept H2 (P<0.05), therefore highlighting a significant difference between exercise intensities. When the high intensity intermittent protocol was split for separate analysis of the sprint and recovery phase, statistically significant (P<0.05) differences exist in measurements of THC (uM) and oxygen saturation (%) between all 3 exercise conditions, additionally confirmed by post-hoc ‘Bonferroni correction’ analysis (P<0.0167). From graphical representation it is evident that at the end of the recovery phase during the intermittent protocol, oxygen saturation and THC are simultaneously at their highest level. It consequently appears possible to suggest that high intensity intermittent exercise is the most beneficial form of training to optimise responses at a peripheral level. Furthermore, previous research provides the potential to infer chronic cardiovascular changes with significant associations to improving VO2 max.
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