Thesis-2004-Backhouse.pdf (15.48 MB)
Fluid ingestion, affective states and perceived exertion during prolonged exercise
thesis
posted on 2011-10-14, 15:20 authored by Susan H. BackhouseThe impact of nutritional intervention on affective states has largely been ignored
in the exercise-affect literature. For decades the impact of such interventions on
perceptions of exertion has been well documented. However, Hardy and Rejeski
(1989) assert that `what' a person feels, as measured by the rating of perceived
exertion (RPE) scale, may be very different from `how' they feel, and that on its
own the RPE provides limited information about the subjective experiences of
individuals during exercise. This thesis describes a series of studies that assess the
influence of various fluid ingestion regimes on both `how' and `what' a person
feels. Seven studies were undertaken, incorporating a variety of exercise modes,
including prolonged running (Study 1,3 & 7), prolonged cycling (Study 2& 4)
and prolonged intermittent, high intensity exercise (Study 5,6 & 7).
The relationship between fluid ingestion during exercise and affective states
during and following exercise proved to be a complex one. The initial
investigation (Study 1) showed that the ingestion of water during prolonged
running resulted in an overall improvement in valence during the recovery period.
A significant increase in activation was also noted in the water trial only, from pre
to post exercise. Furthermore, subjective ratings of energy post-exercise were
higher in the water trial, compared to the no water trial. In study 2 the beneficial
effects observed in study 1 were not so apparent. In this instance the only
significant change of interest was in energetic arousal, which was found to be
higher 5 min post exercise in the water trial compared to the no water trial. When
the ingestion of a CHO solution during exercise was compared to a placebo or
flavoured water solution (Studies 3-7) the findings also varied. However, the
observation of an enhanced affective profile following CHO ingestion in Study 4
and Study 5 highlights the importance of considering nutritional status and
intervention when investigating the exercise-affect relationship. These studies have highlighted some important aspects in our understanding of the exercise-affect relationship alone. Firstly, a robust finding across all the studies
was the observation of an almost uniformly positive shift in valence from the final
within-exercise assessment to the post exercise assessments. Thus emphasising the
dynamic nature of affect and the importance of repeated within exercise
assessments. Secondly, moderate intensity exercise of a fixed duration was marked
by highly variable inter-individual differences in the response of participants to the valence and activation dimensions. However, exercise to fatigue elicited a
homogenous valence response as participants came closer to reaching their
exercise capacity.
History
School
- Sport, Exercise and Health Sciences
Publisher
© S.H. BackhousePublication date
2004Notes
A Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough University.EThOS Persistent ID
uk.bl.ethos.414971Language
- en