The effects of exercise interventions on physical function tests and glycemic control in adults with type 2 diabetes: A systematic review

Long-term impact of Diabetes Prevention Program interventions on walking endurance

Objectives

Type 2 diabetes (T2D) and prediabetes are associated with poor walking endurance, a marker of physical function. We aimed to examine the long-term effects of metformin or intensive lifestyle intervention in adults at high risk of T2D on their 6-min walk test (6MWT) performance.

Methods

Participants were randomized in the 3-year Diabetes Prevention Program (DPP) to one of the three groups: lifestyle intervention, metformin, or placebo, and were subsequently followed in the DPP Outcomes Study. A 6MWT was conducted 20 years after randomization. Associations between DPP interventions and 6MWT completion (achieving a distance ≥200 m) were assessed using logistic regression. Among the test completers, differences in distance walked (6MWD) were evaluated using multivariable linear regression. Additional variables of interest included concomitant measures of body mass index (BMI) and grip strength along with mean measures of HbA1c and self-reported physical activity (PA).

Results

Data on 1830 participants were analyzed. The interventions were not associated with test completion or the 6MWD among test completers (362, 364, and 360 m in the lifestyle, metformin, and placebo groups, respectively, p = 0.8). Age, education, grip strength, and PA were each significantly associated with the 6MWT completion and the 6MWD after adjustment. Grip strength, PA, and education were positively associated with the 6MWD, while age, BMI, and HbA1c were negatively associated with the 6MWD.

Conclusion

We confirmed that the 6MWT is related to other measures of physical ability such as PA and grip strength in persons at risk for and with T2D, suggesting potential long-term benefits of maintaining a healthy lifestyle. However, we did not observe a sustained effect of the original randomized interventions.

Clinical trial registration

http://www.clinicaltrials.gov/ct/show/NCT00004992, identifier DPP NCT00004992; http://www.clinicaltrials.gov/ct/show/NCT00038727, identifier DPPOS NCT00038727.

Improvement in physical function and lipid profile following low-intensity resistance training and a lower limb conditioning program in people with diabetic neuropathy

BACKGROUND

Diabetic peripheral neuropathy (DPN) impairs glucose and fat metabolism and physical functioning. This study examined the effects of low-intensity resistance exercise training (LI-RT) and a lower limb conditioning program (LLCP) on physical function and lipid profile in DPN.

METHODS

Forty-five diabetic women with mild to moderate neuropathy (55.5 ± 3.1 y) were randomly assigned to one of three groups: LI-RT (n = 15), LLCP (n = 15), and control (n = 15). The LI-RT and LLCP groups trained 3 times/week (90 min/session) for 12 weeks. The LI-RT group completed 3 sets of 10 repetitions for ten exercises at 30-repetition maximum; the LLCP group performed 12 lower extremity motions designed for peripheral neuropathy; and the control group followed their routine daily activities. Physical function was assessed using the Timed Up and Go Test (TUG), Five Times Sit-to-Stand (FTSTS) test, and 6-min walking test (6MWT). Blood lipid profile was assessed.

RESULTS

Both the LI-RT and LLCP groups significantly improved in TUG scores compared to the control group (p ≤ 0.05). No significant changes between groups were observed for the FTSTS and 6MWT. The LI-RT and LLCP groups, compared to the control group, showed a significant reduction in low-density lipoprotein (p ≤ 0.05), and triglycerides (p ≤ 0.001). High-density lipoproteins showed non-significant changes.

CONCLUSION

Low intensity training involving resistance exercises or lower limb range of motion enhance physical function and lipid profile in patients with DPN. High intensity exercise could be risky and deter adherence. Hence, these gentler exercise programs offer viable options for enhancing health and fitness in DPN patients.

How effective are allied health group interventions for the management of adults with long-term conditions? An umbrella review of systematic reviews and its applicability to the Australian primary health system

BACKGROUND

Group allied health interventions for people with chronic conditions may be a solution to increasing access to allied health in primary care. This umbrella review aimed to determine the effectiveness of allied health group interventions to improve health-related outcomes for adults with chronic conditions and the applicability of the findings to the Australian primary health care context.

METHODS

An umbrella review of systematic reviews conducted April-July 2022, searching eight databases. Systematic reviews were eligible if they included randomised controlled trials (RCT) or quasi-RCTs, community dwelling adults aged ≥ 18, at least one chronic condition, group intervention in scope for allied health professionals, and published in English after 2000. Studies were excluded if interventions were conducted in hospital or aged care facilities, out of scope for allied health, or unsupervised.

RESULTS

Two thousand three hundred eighty-five systematic reviews were identified: after screening and full text review 154 were included and data extracted from 90. The chronic conditions included: cancer (n = 15), cardiovascular disease (n = 6), mixed chronic conditions (n = 3), kidney disease (n = 1), low back pain (n = 12), respiratory disease (n = 8), diabetes (n = 14), heart failure (n = 9), risk of falls (n = 5), hypertension (n = 4, osteoarthritis (n = 6) and stroke (n = 8). Most group interventions included prescribed exercise and were in scope for physiotherapists and exercise physiologists. Overall, allied health group exercise programs for community dwelling adults improved health outcomes for most chronic conditions. Aggregated data from the systematic reviews suggests programs of 45-60 min per session, 2-3 times per week for 12 weeks. Lifestyle education and support for people with type-2 diabetes improved glycaemic control.

CONCLUSIONS

Prescribed group exercise delivered by allied health professionals, predominantly by exercise physiologists and physiotherapists, significantly improved health outcomes for community dwelling adults with a broad range of chronic conditions.

Therapeutic Potential of Various Intermittent Fasting Regimens in Alleviating Type 2 Diabetes Mellitus and Prediabetes: A Narrative Review

Intermittent fasting has drawn significant interest in the clinical research community due to its potential to address metabolic complications such as obesity and type 2 diabetes mellitus. Various intermittent fasting regimens include alternate-day fasting (24 h of fasting followed by 24 h of eating), time-restricted fasting (fasting for 14 h and eating within a 10 h window), and the 5:2 diet (fasting for two days and eating normally for the other five days). Intermittent fasting is associated with a reduced risk of type 2 diabetes mellitus-related complications and can slow their progression. The increasing global prevalence of type 2 diabetes mellitus highlights the importance of early management. Since prediabetes is a precursor to type 2 diabetes mellitus, understanding its progression is essential. However, the long-term effects of intermittent fasting on prediabetes are not yet well understood. Therefore, this review aims to comprehensively compile existing knowledge on the therapeutic effects of intermittent fasting in managing type 2 diabetes mellitus and prediabetes.

Association Between Physical Activity and Physical Function in a Marshallese Population with Type 2 Diabetes

Physical activity can delay functional decline in people with type 2 diabetes (T2D), but these associations have not been studied within a sample of Native Hawaiian or Pacific Islander adults with T2D. Using data from a randomized control trial in which 218 Marshallese adults with T2D participated in a 10-week diabetes self-management education intervention, this study tested our hypothesis that physical activity would predict physical function when controlling for time and other variables. Levels of physical activity were positively associated with levels of physical function, even after controlling for time and other covariates. These findings provide a more robust understanding of the relationship between physical activity and physical function in a sample of minority adults with T2D. Future studies should further explore levels of physical activity needed to maintain and improve physical function so that culturally appropriate physical activity interventions can be developed.

Assessing physical function after completing a supervised education and exercise program in adults with type 2 diabetes and exploring exercise motivation at one-year follow up: A case series study

BACKGROUND

Exercise programs for adults with type 2 diabetes (T2D) improve glycemic control and physical function. However, diabetes complications, disability, and motivation pose challenges for exercise participation.

OBJECTIVE

The purpose of the study was to: 1) measure change in fasting blood glucose, blood pressure, anthropometrics (i.e. BMI and waist circumference), and physical function (i.e. endurance, agility and balance, upper and lower-body strength and flexibility) after completing an eight-week education and exercise program for adults with T2D; and 2) explore the experience of exercise continuation in people living with T2D at one-year follow-up.

METHODS

A mixed methods case series design was conducted. Participants were ≥ 18 years and had a clinical diagnosis of T2D (glycated hemoglobin (A1C) ≥ 6.5%). Participants completed two one-hour exercise sessions and one one-hour education session per week for eight weeks. Blood glucose, blood pressure, body mass index (BMI), waist circumference, and physical function were measured at baseline and after completing the program. Follow-up telephone interviews were conducted at one, six, and 12-months and thematic analysis was employed to analyze interviews.

RESULTS

Twelve participants completed the program. Clinically significant improvements were observed for waist circumference, systolic blood pressure, six-minute walk test (6MWT), timed up-and-go test (TUG), 30-second chair stand test (CST) and arm curls. Three themes emerged from the interviews that described participant reflections and experiences with a supervised education and exercise program for management of their T2D: 1) medical management; 2) lifestyle management; and 3) finding what works. Conclusion: Supervised programming improves physical function and may mitigate disability. Physiotherapists are qualified to assess and treat physical function through education and exercise.

The Effect of Exercise on Quality of Life in Type 2 Diabetes: A Systematic Review and Meta-analysis

BACKGROUND

Exercise is a proven therapy for managing cardiometabolic risk factors in type 2 diabetes (T2D). However, its effects on patient-reported outcome measures such as quality of life (QoL) in people with T2D remain unclear. Consequently, the primary aim of this study was to determine the effect of regular exercise on QoL in adults with T2D. A secondary aim was to determine the effect of different exercise modalities on QoL. The third aim was to determine whether improvements in QoL were associated with improvements in gly'cated hemoglobin (A1C).

METHODS

Relevant databases were searched to May 2022. Eligible studies included randomized trials involving ≥2 wk of aerobic and/or resistance exercise and assessed QoL using a purpose-specific tool. Mean differences and 95% confidence intervals (CI) were calculated as standardized mean difference (SMD) or weighted mean difference. A regression analysis was undertaken to examine the interaction between change in QoL with change in A1C.

RESULTS

Of the 12,642 studies retrieved, 29 were included involving 2354 participants. Exercise improved QoL when compared with control (SMD, 0.384; 95% CI, 0.257 to 0.512; P < 0.001). Aerobic exercise, alone (SMD, 0.475; 95% CI, 0.295 to 0.655; P < 0.001) or in combination with resistance training (SMD, 0.363; 95% CI, 0.179 to 0.548; P < 0.001) improved QoL, whereas resistance training alone did not. Physical components of health-related QoL (HRQoL) improved with all exercise modalities, but mental components of HRQoL remained unchanged. Exercise improved A1C (mean difference, -0.509%; 95% CI, -0.806% to -0.212%; P = 0.001), and this change was associated with improvements in HRQoL ( β = -0.305, SE = 0.140, Z = -2.18, P = 0.030).

CONCLUSIONS

These results provide robust evidence that regular aerobic exercise alone or in combination with resistance training is effective for improving QoL in adults with T2D. Such improvements seem to be mediated by improvements in physical components of HRQoL and are associated with improved blood glucose control. Further studies should be undertaken to determine the relative importance of exercise duration, intensity, and frequency on patient-reported outcomes such as QoL.

Effects of Endurance Exercise and Vitamin D Supplementation on Insulin Resistance and Plasma Lipidome in Middle-Aged Adults with Type 2 Diabetes

(1) Background: We investigated the effects of a 12-week exercise intervention with or without vitamin D supplementation on insulin resistance and the plasma lipidome of participants with type 2 diabetes. We further explored whether the effects of the intervention on glycemic parameters could be associated with the baseline lipidome. (2) Methods: Sixty-one participants were randomly allocated to control (Con), exercise (EX), vitamin D (VD), and EX + VD groups. Multiple glycemic and anthropometric parameters were evaluated before and after intervention. The homeostasis model assessment of insulin resistance (HOMA-IR) was the primary outcome. The plasma lipidome was analyzed before, after, and at an additional 12-week follow-up. Machine learning was applied to establish prediction models for responsiveness of glycemic control. (3) Results: Our interventions failed to improve the HOMA-IR index while fasting glucose was reduced in the EX + VD group (change%, -11.9%; effect size, 0.65; p < 0.05). Both EX and VD interventions altered the plasma lipidome, with EX + VD intervention considerably affecting levels of lyso-phosphatidylcholines and triglycerols containing long-chain unsaturated fatty acids. Such effects could last until 12 weeks after intervention. Notably, there was high inter-individual variability in glycemic parameters including HOMA-IR in response to the interventions, which could be predicted with great accuracy using an optimal panel of baseline lipid predictors alone or in combination with clinical indices, as assessed by an area under the receiver operating characteristic curve value of over 0.9. (4) Conclusions: Although substantial alterations were observed in the plasma lipidome related to glycemic control, our intervention failed to improve HOMA-IR scores, which may have been predominately due to the large inter-individual variability in responses. Basal plasma lipid levels could potentially predict an individual's response to intervention, highlighting the necessity of personalized nutrition.

Little but Intense: Using a HIIT-Based Strategy to Improve Mood and Cognitive Functioning in College Students

Looking for useful and motivational strategies for promoting healthy habits and improving cognitive functioning in young populations, the aim of the present study was to determine if a single bout of high-intensity interval exercise could stimulate mood and working memory in college students. A total of 25 male subjects (mean ± SD, age: 21.7 ± 2.1 years; height: 1.77 ± 0.06 m; weight: 72.6 ± 8.4 kg; body mass index: 23.1 ± 1.4 kg/m²; VO_2peak: 47.1 ± 9.3 mL/kg/min) participated voluntarily in this study. Participants underwent a high-intensity interval exercise consisting of 10 × 1 min of cycling at VO_2peak power output. The Profile of Mood States (POMS) questionnaire and Digit Span Test (DST) were administered at three assessment time points: (a) pre-intervention assessment, (b) post-intervention assessment, and (c) 30 min post-intervention. The mood states decreased significantly after exercise; however, a significant increase in mood was found after 30 min of recovery. A significant post-exercise increase in DST performance was observed; moreover, DST scores obtained 30 min after exercise remained higher than those assessed pre-exercise. In conclusion, a single bout of HIIT induces acute positive changes in mood states in male college students and seems to be a powerful stimulus for cognitive functioning.

Physiotherapists’ Perspectives on Type 2 Diabetes Management and as a Primary Condition for Referral to Physiotherapy Services: A Qualitative Descriptive Study

Purpose:

We explored the current and potential role of physiotherapists in the management of people with type 2 diabetes (T2D) and T2D as a primary condition for physiotherapy referral.

Method:

We conducted a qualitative descriptive study. Participants were physiotherapists practicing in community and outpatient settings across Canada. One-on-one telephone interviews were completed to explore provision of physiotherapy care for people with T2D, including current practices and readiness of physiotherapists to provide direct care. We employed thematic analysis for generation of themes from interviews.

Results:

We interviewed 21 participants from eight provinces and territories. Three themes were generated from the data: current approach to T2D management; challenges for physiotherapy integration; and merits of physiotherapy and needed evolution. Participants described that physiotherapists are not part of the healthcare team for T2D management. There is a gap in medical management of T2D that physiotherapy would fill, that is, education and prescription for exercise participation.

Conclusions:

Our findings support a gap in the management of T2D in Canadian healthcare, particularly in reference to physiotherapy. Further, our findings support the need for greater inclusion of physiotherapists for lifestyle counseling with an emphasis on physical activity and exercise for patients at risk of and with T2D to maximize health and improve/maintain function. Studies focusing on accessibility and funding of physiotherapy services are needed to validate these findings.

Exercise, medication adherence, and the menstrual cycle: How much do these change seizure risk?

People with epilepsy can experience tremendous stress from the uncertainty of when a seizure will occur. Three factors deemed important because of their potential influence on seizure risk are exercise, medication adherence, and the menstrual cycle. A narrative review was conducted through PubMed searching for relevant articles on how seizure risk is modified by 1) exercise, 2) medication adherence, and 3) the menstrual cycle. There was no consensus about the impact of exercise on seizure risk. Studies about medication nonadherence suggested an increase in seizure risk, but there was not a sufficient amount of data for a definitive conclusion. Most studies about the menstrual cycle reported an increase in seizures connected to a specific aspect of the menstrual cycle. No definitive studies were available to quantify this impact precisely. All three triggers reviewed had gaps in the research available, making it not yet possible to definitively quantify a relationship to seizure risk. More quantitative prospective studies are needed to ascertain the extent to which these triggers modify seizure risk.