Abstract
Dose-Response Relationship Between Daily Steps And Fat Metabolism In Young Adults: 469
Medicine and science in sports and exercise, Vol.54(9S Suppl 2), pp.114-114
09/01/2022
DOI: 10.1249/01.mss.0000876464.96250.83
Abstract
INTRODUCTION: A 10,000-step per day target is often suggested to meaningfully improve cardiometabolic health. However, emerging epidemiological evidence suggests reductions in risk can be achieved with lower steps·day-1.
PURPOSE: We assessed the effects of daily step dose on resting energy expenditure (REE), respiratory exchange ratio (RER), fat oxidation rate (FOR), and the postprandial lipemic (PPL; i.e., triglyceride(TG)) response to a high-fat mixed meal (HFMM).
METHODS: Nine young adults (30 ± 8 y; 5 female) completed 4 separate, randomly ordered conditions in which they walked 2,000 (2K), 5,000 (5K), 10,000 (10K), and 15,000 (15K) steps·day-1performed in three separate bouts. Standardized meals were provided and activity was controlled on experimental days. Participants’ physical activity and diet were also standardized the day prior to each experimental visit and confirmed using accelerometry and dietary logs. Thirty minutes after their final walking bout, REE, RER, and FOR were measured with indirect calorimetry. A blood sample was obtained from the antecubital vein to measure baseline TG, and then participants consumed a standardized HFMM (960 kcal; 48% fat). Postprandial TG were measured 30-, 60-,90-, 120-, and 240-min post-meal. Statistical analyses included two-way or one-way ANOVAs, with post-hoc tests for linear and non-linear trends or Holm-Sidak-corrected comparisons as appropriate. Results are reported as mean ±SD.
RESULTS: Participants walked 2,013 ± 167, 5,066 ± 98, 10,022 ± 45, and 15,119 ± 321 steps in the 2K, 5K, 10K, and 15K conditions. There was no effect of step dose on REE (p = 0.42), but RER decreased linearly (p =0.003) from 2K (0.838 ± 0.05) to 15K (0.783 ± 0.04). Similarly, FOR increased linearly (p = 0.003) from 2K (0.072 ± 0.02 g/min) to 15K (0.101 ± 0.04g/min). There was a significant condition effect of step dose on PPL (p= 0.041). This effect was characterized as linear (p = 0.039) where PPL decreased from 2K (134 ± 53 mg/dL) to 10K (108 ± 35 mg/dL), and only PPL at 10K was lower than 2K (p = 0.03).
CONCLUSION: While there were linear increases in resting fat oxidation with increasing step dosage, the postprandial triglyceride response was lowest at 10K. Future analyses of factors important to the regulation of fatty acid metabolism will be essential to understand this apparent discrepancy.
Details
- Title: Subtitle
- Dose-Response Relationship Between Daily Steps And Fat Metabolism In Young Adults: 469
- Creators
- Emily M. Rogers - University of IowaNile F. Banks - University of IowaNathaniel D.M. Jenkins - University of Iowa
- Resource Type
- Abstract
- Publication Details
- Medicine and science in sports and exercise, Vol.54(9S Suppl 2), pp.114-114
- DOI
- 10.1249/01.mss.0000876464.96250.83
- ISSN
- 0195-9131
- Publisher
- Lippincott Williams & Wilkins
- Language
- English
- Date published
- 09/01/2022
- Academic Unit
- Center for Social Science Innovation; Injury Prevention Research Center; Health, Sport, and Human Physiology
- Record Identifier
- 9984749559602771
Metrics
17 Record Views