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  • Effect of meal glycemic load and caffeine consumption on prolonged monotonous driving performance

    Author(s)
    Bragg, Christopher
    Desbrow, Ben
    Hall, Susan
    Irwin, Christopher
    Griffith University Author(s)
    Irwin, Chris G.
    Hall, Susan
    Desbrow, Ben
    Year published
    2017
    Metadata
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    Abstract
    Objective: Monotonous driving involves low levels of stimulation and high levels of repetition and is essentially an exercise in sustained attention and vigilance. The aim of this study was to determine the effects of consuming a high or low glycemic load meal on prolonged monotonous driving performance. The effect of consuming caffeine with a high glycemic load meal was also examined. Method: Ten healthy, non-diabetic participants (7 males, age 51 ± 7 yrs, mean ± SD) completed a repeated measures investigation involving 3 experimental trials. On separate occasions, participants were provided one of three treatments prior ...
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    Objective: Monotonous driving involves low levels of stimulation and high levels of repetition and is essentially an exercise in sustained attention and vigilance. The aim of this study was to determine the effects of consuming a high or low glycemic load meal on prolonged monotonous driving performance. The effect of consuming caffeine with a high glycemic load meal was also examined. Method: Ten healthy, non-diabetic participants (7 males, age 51 ± 7 yrs, mean ± SD) completed a repeated measures investigation involving 3 experimental trials. On separate occasions, participants were provided one of three treatments prior to undertaking a 90 min computer-based simulated drive. The 3 treatment conditions involved consuming: (1) a low glycemic load meal + placebo capsules (LGL), (2) a high glycemic load meal + placebo capsules (HGL) and (3) a high glycemic load meal + caffeine capsules (3 mg kg− 1 body weight) (CAF). Measures of driving performance included lateral (standard deviation of lane position (SDLP), average lane position (AVLP), total number of lane crossings (LC)) and longitudinal (average speed (AVSP) and standard deviation of speed (SDSP)) vehicle control parameters. Blood glucose levels, plasma caffeine concentrations and subjective ratings of sleepiness, alertness, mood, hunger and simulator sickness were also collected throughout each trial. Result: No difference in either lateral or longitudinal vehicle control parameters or subjective ratings were observed between HGL and LGL treatments. A significant reduction in SDLP (0.36 ± 0.20 m vs 0.41 ± 0.19 m, p = 0.004) and LC (34.4 ± 31.4 vs 56.7 ± 31.5, p = 0.018) was observed in the CAF trial compared to the HGL trial. However, no differences in AVLP, AVSP and SDSP or subjective ratings were detected between these two trials (p > 0.05). Conclusion: Altering the glycemic load of a breakfast meal had no effect on measures of monotonous driving performance in non-diabetic adults. Individuals planning to undertake a prolonged monotonous drive following consumption of a morning meal may consider consuming caffeine as a means of improving vehicle control.
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    Journal Title
    Physiology & Behavior
    Volume
    181
    DOI
    https://doi.org/10.1016/j.physbeh.2017.09.013
    Subject
    Psychology
    Nutrition and dietetics
    Nutrition and dietetics not elsewhere classified
    Cognition
    Publication URI
    http://hdl.handle.net/10072/355188
    Collection
    • Journal articles

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