Abstract
Background:
Continuous glucose monitors (CGMs) are promoted to athletes as a tool to monitor metabolic responses to daily training and fuelling.
Aim:
To understand whether CGMs could support athletic performance, the reliability of these devices among endurance athletes needs to be defined.
Methods:
Twelve elite race-walking athletes (n = 7 men, 22.4 ± 3.5 years, VO2 max 61.6 ± 7.3 mL/kg/min) completed two 4-day trials separated by 4 days. Athletes were provided a weight-maintaining diet (225 ± 1.6 kJ/kg/day, 8.4 ± 0.3 g/kg/day carbohydrate) and completed standardised daily exercise. The timing, type and amount of food consumed and exercise undertaken were matched across each 4-day trial. Interstitial glucose data were collected via Freestyle Libre 2 CGMs (Abbott Diabetes Care, Chicago, IL, USA). Glycaemic variability was calculated as the mean amplitude of glycaemic excursions (MAGE), mean of daily differences (MODD) and standard deviation (SD).
Results:
Twenty-four-hour MAGE, MODD and SD for interstitial glucose were 2.0 ± 0.3, 0.7 ± 0.1 and 0.9 ± 0.1 mmol/L, respectively. Twenty-four-hour mean glucose (MG; 5.7 ± 0.3 mmol/L) was higher than overnight (5.1 ± 0.3 mmol/L; p < 0.0001) and was lower in women than men (5.5 ± 0.2 mmol/L vs. 5.8 ± 0.2 mmol/L; p = 0.059, d 1.4).
Conclusions:
This study provides reference indices for glycaemic variability amongst endurance athletes which are lower than reported values for healthy individuals, despite high energy and carbohydrate intakes. Differences exist between men and women's MG, despite standardised exercise and dietary conditions and warrants further consideration.
Continuous glucose monitors (CGMs) are promoted to athletes as a tool to monitor metabolic responses to daily training and fuelling.
Aim:
To understand whether CGMs could support athletic performance, the reliability of these devices among endurance athletes needs to be defined.
Methods:
Twelve elite race-walking athletes (n = 7 men, 22.4 ± 3.5 years, VO2 max 61.6 ± 7.3 mL/kg/min) completed two 4-day trials separated by 4 days. Athletes were provided a weight-maintaining diet (225 ± 1.6 kJ/kg/day, 8.4 ± 0.3 g/kg/day carbohydrate) and completed standardised daily exercise. The timing, type and amount of food consumed and exercise undertaken were matched across each 4-day trial. Interstitial glucose data were collected via Freestyle Libre 2 CGMs (Abbott Diabetes Care, Chicago, IL, USA). Glycaemic variability was calculated as the mean amplitude of glycaemic excursions (MAGE), mean of daily differences (MODD) and standard deviation (SD).
Results:
Twenty-four-hour MAGE, MODD and SD for interstitial glucose were 2.0 ± 0.3, 0.7 ± 0.1 and 0.9 ± 0.1 mmol/L, respectively. Twenty-four-hour mean glucose (MG; 5.7 ± 0.3 mmol/L) was higher than overnight (5.1 ± 0.3 mmol/L; p < 0.0001) and was lower in women than men (5.5 ± 0.2 mmol/L vs. 5.8 ± 0.2 mmol/L; p = 0.059, d 1.4).
Conclusions:
This study provides reference indices for glycaemic variability amongst endurance athletes which are lower than reported values for healthy individuals, despite high energy and carbohydrate intakes. Differences exist between men and women's MG, despite standardised exercise and dietary conditions and warrants further consideration.
| Original language | English |
|---|---|
| DOIs | |
| Publication status | Published - 23 Oct 2023 |
| Event | 2023 SDA Conference: Sports Dietitians Australia - University of Sunshine Coast, Sippy Downs, Australia Duration: 27 Oct 2023 → 28 Oct 2023 https://www.sportsdietitians.com.au/product/2023-sda-conference-early-bird-member-remote-2-days/ |
Conference
| Conference | 2023 SDA Conference |
|---|---|
| Country/Territory | Australia |
| City | Sippy Downs |
| Period | 27/10/23 → 28/10/23 |
| Other | We are assembling a line-up of experienced and well-respected professionals to discuss key advancements in sports nutrition research that will influence sports nutrition practice now and in the future. |
| Internet address |
