AUTHOR=Zhu Xingyun , Zhao Lina , Chen Jing , Lin Chu , Lv Fang , Hu Suiyuan , Cai Xiaoling , Zhang Li , Ji Linong 

TITLE=The Effect of Physical Activity on Glycemic Variability in Patients With Diabetes: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

JOURNAL=Frontiers in Endocrinology

VOLUME=Volume 12 - 2021

YEAR=2021

URL=https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2021.767152

DOI=10.3389/fendo.2021.767152

ISSN=1664-2392

ABSTRACT=Purpose: The effect of physical activity on glycemic variability remains controversial. This meta-analysis aimed to assess the overall effect of physical activity treatment on glycemic variability in patients with diabetes. 
Methods: PubMed/MEDLINE, Embase, and Cochrane databases were searched for clinical trials that conducted in patients with type 1 diabetes mellitus and type 2 diabetes mellitus with reports of mean amplitude of glycemic excursion (MAGE), time in range (TIR), time above range (TAR), or time below range (TBR). Eligible trials were analyzed by fixed-effect model, random effect model, and meta-regression analysis accordingly. 
Results: In total, thirteen trials were included. Compared with the control group, physical activity intervention was associated with significantly increasing TIR (WMDs, 4.17 %; 95% CI, 1.11 to 7.23 %, P＜0.01) and significantly decreasing MAGE (WMDs, -0.68 mmol/L; 95% CI, -1.01 to -0.36 mmol/L, P＜0.01) and TAR (WMDs, -3.54 %; 95% CI, -5.21 to -1.88 %, P＜0.01) in patients with diabetes, but was not associated with increasing TBR. Patients with higher baseline BMI levels have a greater decrease in MAGE (β=-0.903, 95% CI: -1.550, -0.255), and patients with lower baseline HbA1c levels have a greater increase in TBR during physical activities (β=-2.347, 95% CI: -5.482, -0.789).
Conclusion: Physical activity was associated with significantly decreased glycemic variability in patients with diabetes. Patients with higher body weight might benefit more from physical activity therapy. Hypoglycemia associated with physical activity treatment still warranted caution, especially in patients with intensive glycemic control. This study is registered with PROSPERO, number CRD42021259807.