Immediate post-breakfast physical activity improves interstitial postprandial glycemia: a comparison of different activity-meal timings.

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ID: 57774
2019
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Abstract
The optimal timing between meal ingestion and simple physical activity for improving blood glucose control is unknown. This study compared the effects of physical activity on postprandial interstitial glucose responses when the activity was conducted either immediately before, immediately after, or 30 min after breakfast. Forty-eight adults were randomized to three separate physical activity interventions: standing still (for 30 min), walking (for 30 min), and bodyweight exercises (3 sets of 10 squats, 10 push-ups, 10 lunges, 10 sit-ups). In each intervention, 16 participants completed four trials (A to D) during which a 500 kcal mixed nutrient liquid breakfast meal was consumed. Interstitial glucose responses were recorded using continuous glucose monitoring for 2 h after the meal. The activity was completed either after the glucose monitoring period (trial A; control) or immediately before (trial B), immediately after (trial C), or 30 min after (trial D) the breakfast. Mean, coefficient of variance (CV), and area under the curve (AUC) for glucose were calculated and compared between the four trials. Walking and bodyweight exercises immediately after the meal improved mean, CV, and AUC glucose (P ≤ 0.05 vs. control), while standing immediately after the meal only improved AUC glucose (P ≤ 0.05 vs. control) and nearly improved mean glucose (P = 0.06). Mean, CV, and AUC glucose were not affected by standing, walking, or bodyweight exercise conducted immediately before, or 30 min after the meal (all P > 0.05 vs. control). Energy intake (diet records) and energy expenditure (Actigraph) were consistent throughout the studies and did not influence the findings. Low- to moderate-intensity activity should be implemented soon after eating to improve glucose control following breakfast. The type of activity appears less important than the timing. These findings will help optimize exercise-meal timing in general health guidelines. ClinicalTrials.gov Identifier: NCT03730727.
Reference Key
solomon2019immediatepflugers Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Solomon, Thomas P J;Tarry, Eloise;Hudson, Chloe O;Fitt, Alice I;Laye, Matthew J;
Journal pflugers archiv : european journal of physiology
Year 2019
DOI
10.1007/s00424-019-02300-4
URL
Keywords
glycemic control continuous glucose monitoring glycemic variability exercise walking office workers cgm circuit training exercise-meal timing inactivity sitting breaks sitting time standing

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