Effects of acute aerobic exercise, dehydration and ad libitum fluid consumption on mood and choice reaction time in trained females: A distributional analysis

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McCartney, D
Desbrow, B
Cox, GR
Irwin, C
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2019
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Abstract

This study investigated the effect of acute aerobic exercise, dehydration and fluid intake on choice reaction time (CRT) and the ex-Gaussian CRT distribution. On 4 separate occasions, 8 trained females (body mass [BM]: 61.8±10.7 kg; VO2 max: 46.3±7.5 mL·kg-1·min-1) lost 2.0±0.3% BM cycling at ~75% VO2max (~60 min, 24.2±0.9°C) before commencing a 1 h recovery period with ad libitum access to one of 4 beverages: Water, Powerade® Isotonic (SD), Up&Go EnergizeTM (HP-MILK) and Up&Go Reduced SugarTM (LS-MILK). Participants had an additional 15 min to consume food (e.g. muesli bars, fruit, bread and condiments) ad libitum at the end of the 1 h period. CRT and mood (concentration and alertness) were assessed 'Pre-Exercise', ~5 min 'Post-Exercise' and 'Post-Recovery'. Median CRT decreased Post-Exercise (401±48 ms) compared to Pre-Exercise (420±48 ms, p=0.025) and Post-Recovery values (427±49 ms, p=0.050). This improvement was localized to the μ-component of the ex-Gaussian CRT distribution (Pre-Exercise: 393±40 ms; Post-Exercise: 366±47 ms; Post-Recovery: 395±52 ms, p=0.018); the spread and skew of the distribution (i.e. σ- and τ-parameters) was unchanged across trials (p's>0.05). The effect on μ was relatively consistent across each exercise occasion (Hedges' g range: 0.32-0.63). No changes in mood were identified across time (p's>0.05). While beverage intake was similar across treatments (p=0.351), differences in total (i.e. food plus fluid) energy (p=0.014) and carbohydrate (CHO) (p<0.001) consumption were observed. Still, the type of beverage consumed did not affect mood, CRT or the ex-Gaussian CRT distribution (p's>0.05). Acute aerobic exercise provides a cognitive performance benefit, which appears to outweigh any adverse effects imposed by dehydration in the immediate post-exercise period in trained females.

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Pertanika Journal of Social Sciences and Humanities

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27

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S3

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© 2019 The Authors & Universiti Putra Malaysia. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.

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Nutrition and dietetics

Sport and exercise nutrition

Sports science and exercise

Cognition

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McCartney, D; Desbrow, B; Cox, GR; Irwin, C, Effects of acute aerobic exercise, dehydration and ad libitum fluid consumption on mood and choice reaction time in trained females: A distributional analysis, Pertanika Journal of Social Sciences and Humanities, 2019, 27 (S3), pp. 169-181

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