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Entry

Optimizing Lifestyle Behaviors in Preventing Multiple Long-Term Conditions

by
Ahmad Alkhatib
School of Health and Life Sciences, Teesside University, Tees Valley, Middlesbrough TS1 3BX, UK
Encyclopedia 2023, 3(2), 468-477; https://doi.org/10.3390/encyclopedia3020032
Submission received: 31 January 2023 / Revised: 1 April 2023 / Accepted: 4 April 2023 / Published: 13 April 2023
(This article belongs to the Section Medicine & Pharmacology)
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Definition

:
Multiple long-term conditions such as the simultaneous prevalence of obesity, diabetes and cardiovascular disease are becoming increasingly prevalent globally with major consequences of morbidity, mortality and health economy. Lifestyle preventative approaches, especially combining nutrition and physical activity behavioral components, are essential in preventing multiple long-term conditions. However, funded research programs often focus on a single disease or a condition rather than a cluster of conditions. This entry addresses how lifestyle components, especially exercise and nutrition, could target multiple risk reductions associated with preventing multiple long-term conditions, especially diabetes and cardiovascular disease. Innovative exercise prescription should include different intensity-based approaches, which may include intense forms of exercise, but one size does not fit all. Nutritional intake guidelines can also be individualized to target multiple long-term conditions, which all contribute to informing better public health preventative policies.

Graphical Abstract

1. Introduction

Lifestyle related diseases are becoming prevalent globally and non-communicable diseases (NCDs) such as cardiovascular disease (CVD), cancer, respiratory disease and diabetes are now becoming synonymous causes of mortality among adults. Type-2 diabetes (T2D) prevalence figures have almost reached one in ten adults [1], but this figure is on the rise due to the recent COVID-19 lockdown burdens, especially given the reduced healthcare provision and the increased sedentary lifestyle. Multiple NCDs have often been clustered together as the term multimorbidity is coined, which defines the simultaneous existence of two or more chronic conditions in the same individual, such as diabetes, CVD and hypertension [2]. However, lifestyle being the primary cause of such diseases could serve as the primary preventative approach of multimorbidity; hence, it should remain a priority prevention across the healthcare systems.
Interventions involving lifestyle are well established amongst several NCDs. For example, diabetes prevention programs have shown superior or similar effectiveness to medication in individuals with prediabetes [3,4,5,6]. Conventional components of such lifestyle interventions were primarily driven by physical activity, nutrition and education in individuals with high risks of T2D and cardiovascular disease [7,8]. Large prospective cohort studies have consistently demonstrated that lifestyle interventions have significant risk reduction in T2D incidence among populations with impaired glucose tolerance or those with prediabetes [3,4,5,6]. Both the US diabetes prevention program and the Finnish diabetes studies showed 58% reduced T2D incidence in a large cohort who followed combined physical activity and dietary lifestyle behavior changes over a 5-year period [3,4]. Similar benefits of lifestyle interventions have also been shown across other global regions such as those shown in the Indian Diabetes Study and the Di Qing study in China [5,6]. A single-component nutritional lifestyle intervention, focusing on adopting the Mediterranean diet longitudinally, has also shown CVD prevention effectiveness [9,10]. This intervention was retrospectively analyzed for diabetes incidence in older adults with prediabetes as a secondary outcome, and showed that the Mediterranean diet had reversed prediabetes into the remission state [11]. As such, longitudinal and population-based physical activity and nutritional interventions are recommended to prevent multiple long-term conditions.
However, lessons from such largescale interventions across different countries have also shown that widescale interventions require major government, societal and health care systems’ commitment, significant healthcare cost and coordinated efforts, which are not always possible across the globe [12]. Disparities between high-income countries (HICs) and low- and middle-income countries (LMICs), based on countries’ GDP, have been associated with a prevalence of NCDs across different age groups [13,14]. There is also an issue of health inequality in terms of community reach, recruitment, effectiveness and long-term adherence, even with the same country. Preventative healthcare could target a cluster of NCDs via interventions which could be appropriated across different populations. Therefore, whether and how is an important question to answer via this entry, which proposes lifestyle intervention approaches to address multiple long-term conditions, including those appropriate to reduce health disparities, and offers useful tools for public health researchers and healthcare professionals.

2. Optimization Components of Lifestyle Interventions for Multiple Long-Term Conditions

The design of a lifestyle intervention requires significant coordinated efforts from diverse expertise of healthcare professionals, policy makers and funders, and so it is often faced by numerous organizational barriers [15]. In England, current lifestyle prevention guidelines in both exercise and nutrition are disperse, even for a single condition, let alone for multiple long-term conditions [16]. Given the clear benefits of lifestyle disease prevention, it would be important to appropriate the specific components of lifestyle towards making targeted and practical recommendations for multiple long-term conditions.
Targeting multiple risk reduction of NCDs is possible through ameliorating shared disease mechanisms, such as those contained in obesity, diabetes and cardiovascular disease. Each disease or a condition has specific primary (e.g., reduced incidence rate) and secondary outcomes (e.g., glucose and lipid profiles, blood pressure and cardiorespiratory fitness), which can be modified through targeted adjustments in lifestyle behaviors, whether being physical activity, nutritional, dietary or psychological components. However, it is impossible to solely attribute a single lifestyle component to the desired intervention benefits. Meta-analysis and intervention studies have shown that the benefits of physical activity alone, especially in walking exercise, are more effective in terms of compliance than a combined component approach involving diet and exercise [17,18]. However, a combined approach involving exercise and nutrition changes is effective for its preventative benefits in T2D and associated cardiometabolic outcomes when personalized for the targeted risks, and has been justified for cost-effectiveness [7,8]. Sleep patterns and circadian rhythm, which can be modified, have also been implicated in the risk of developing long-term conditions of hypertension, CVD and T2D, and have been recently associated with the metabolic syndrome [19]. Thus, while a combined approach should always be simplified, the effects of each lifestyle component should be carefully reported. A comparison between longitudinal and prospective cohort studies showed that the simpler the intervention is, the better the long-term preventative effects are for multiple outcomes of long-term conditions. Below (Table 1), are four distinct examples showing outcomes relating to T2D glycemic control (fasting blood glucose, HbA1c, Oral glucose tolerance), hypertension (systolic and diastolic blood pressure), obesity (waist circumference, lipid profile of LDL, HDL, TG, total cholesterol) and incidence of T2D, cardiovascular disease, and mortality.

2.1. Simplifying Exercise Prescription for Multiple Long-Term Conditions

It is difficult to implement physical activity guidelines for healthy adults, let alone for those with multiple long-term conditions. For example, current guidelines involve low-intensity physical activity of 150–300 min per week or intense physical activity of 75 min per week. More recently, high intensity exercise of 20 min per week was added, while twice per week of resistance exercise is also added [23,24,25]. One should also perform flexibility, balance and interval type exercise [23], or increase the physical activity duration from 150 min to 300 min per week, with at least 10 min bouts [24]. Elsewhere, some recommended performing more intense “HIIT” bouts [25]. Together, impractical advice makes it difficult to achieve adherence. In total, over 10 h weekly seems to be recommended (e.g., 5 h aerobic, 2 h or more, resistance, 3 h light exercise, flexibility, balance) [8], which makes achieving it impractical. An individualized and simplified exercise prescription approach which takes into consideration preventing multiple long-term conditions is needed.

2.2. Addressing Gaps in Prescribing Physical Activity High-Intensity Training

High intensity interval training, or HIIT, involves repeated bouts of a shorter duration exercise with a rest interval in between. HIIT as a training concept has grown in recent years from being a sport-related training to enhance elite athletes’ performance into a public health physical activity strategy prescribed for individuals with long-term conditions especially T2D [25,26,27,28]. However, such recommendation has relied on a number of studies that are acute in nature (e.g., training between one and six sessions only), which is too short of a training duration to indue long-term adaptive physiological response [26,27]. Based on this, the term “HIIT” may not be suitable in the absence of training “T” long-term adaptive response and could perhaps be replaced with a “HI”.
The historic definition of HIIT was intermittent exercise in nature and was not meant to induce long-term recovery in the athletic participants who followed such exercise method due to the performance needs of specific sports training (e.g., repeated sprints in football) [29]. Those needs required training which replicated elite sports performance intensities and were associated with enhancing sport-specific tasks and skills, and so were based on stressing the physiological systems at a higher level than that usually required to perform daily physical activity tasks by the general population. Such sports necessity is absent in individuals who are considered mostly sedentary and even more so in individuals who are living with a long-term condition such as CVD and T2D. Despite this knowledge, HIIT has continued to be promoted for managing and preventing T2D and CVD [26,30,31,32]. Examples of the postulated HIIT benefits include modulated glycemic control and mitochondrial biomarkers in those with early T2D diagnosis, following six sessions of HIIT [26], or even a single session or 1 min cycling at 90% of maximal heart rate [27]. The short term nature of those studies makes it difficult to consider them interventions that can be translated into real lifestyle settings. It has been shown that the smallest change in lifestyle, such as to the diurnal cycle or circadian rhythm, can negate any HIIT effects [33]. Therefore, inducing long-term physiological adaptive responses that are beneficial for several cardiometabolic conditions such as CVD and T2D should be the priority of an individualized exercise prescription, rather than a stiff focus on a specific high intensity or “HIIT” as a public health strategy.
In contrast to short term effects, longer-term effects of HIIT have shown contrasting benefits. High-risk groups such as women who are overweight showed no improvement in insulin sensitivity despite reduction in total and abdominal body fat percentage (BF%) following 18 sessions of HIIT [34]. In a more recent study in women with severe obesity (with total BF% = 40%), we found a similarly modest reduction in BF%, but this was combined with negative response in T2D glycemic control which showed significant elevation in both insulin and glucose following eight weeks of a typical HIIT intervention program [35]. Interestingly, the latter side-effects were also combined with increased metabolic endotoxicity, which could be perceived as a negative HIIT confounder when training individuals with obesity. However, this phenomenon of adverse metabolic response in the early to medium phase (1 session to 18 sessions equivalent to 8 weeks interventions) can be explained by the transient nature of the adaptive metabolic responses induced by HIIT, which are mitigated if long-term adherence is achieved. This suggests that ensuring long-term adherence to such an intense exercise training regime is essential, something that is difficult to achieve in high-risk populations with long-term conditions.
The lack of long-term adherence to HIIT in high-risk groups has been questioned due to concerns over inconsistent intensity definition and adverse physiological side effects especially for those with obesity or prediabetes [35,36,37]. In 411 CVD patients, HIIT was not superior to other types of lower intensity training if the isocaloric exercise protocols were compared [38]. The HIIT vs. moderate adherence records also showed a lower adherence and higher injury record in sedentary individuals with T2D [37,38]. HIIT and strength type exercise trainings have both shown several mitochondrial benefits on the proteomics and transcriptomics of young and older healthy individuals [39]. However, HIIT intervention in individuals with severe obesity can deleteriously elevate metabolic endotoxicity and augment the glucose–insulin action cycle following eight weeks of HIIT, though such adverse metabolic response to HIIT can be reversed by nutritional remedies such as simultaneous caffeine ingestion over the whole intervention period [35]. Despite a plethora of cardiovascular, respiratory and metabolic short-term benefits of HIIT, its metabolic side-effects in those with advanced or multiple long-term conditions should be taken into consideration.
Therefore, it would be premature to promote HIIT for the prevention of multiple long-term conditions. Essentially, HIIT is an already known heavy-exercise-intensity physiological domain, with an associated heavy-intensity-domain physiological responses (e.g., blood lactate concentration, oxygen uptake and respiratory quotient) that are already known in exercise physiology since the turn of the 20th Century [40]. After all, HIIT strategy is not a novel because it is simply a form of training in the heavy exercise intensity domain to induce domain-associated cardiometabolic physiological responses. Such a phenomenon is already known in exercise physiology for a century [40].

2.3. Optimizing Prevention of Multiple Conditions through Targeting Sedentary Behavior

Even minimum amounts of physical activity can be effective in preventing multiple conditions including obesity, T2D, cancer and CVD. Evidence from large meta-analyses from the EPIC study (European Prospective Investigation Into Cancer and Nutrition) has demonstrated an association between the lowest mortality risk for people with diabetes with moderate physical activity (hazard ratios were 0.60 for all-cause mortality) compared with a higher risk for the sedentary and less active individuals [41]. Specific to sedentary behavior, a dose–response relationship has been shown between sedentary behavior and all-cause, CVD, cancer mortality and T2D incidence [42]. Thus, reducing multiple long-term conditions requires addressing sedentary behavior prevention as an integral part of interventions.
Sedentary-related risks can target any lifestyle setting, whether leisure-based behaviors or workplace-based sedentary lifestyle. Thus, targeting workplace settings with interventions aimed at reducing sedentary-related cardiovascular risks through workplace screening and interventions is recommended. We have shown benefits in preventing CVD risks based on enhancing cardiorespiratory fitness, indicated by ventilatory threshold and maximal cardiorespiratory capacity, among white-collar sedentary workers based on their specific job roles and genders, and university community staff and students [43,44,45]. For example, there was a reduction in the cardiovascular and respiratory risks among sedentary university campus employees who followed a three-month intervention of moderate exercise intensity, which was individualized according to their ventilatory threshold (VT). The intervention significantly increased their both VT and its associated velocity, and enhanced V ˙ O 2 p e a k [44]. Such benefits were irrespective of weight loss or blood pressure outcomes (Table 2), which is in line with large scale lifestyle interventions aimed at targeted subgroups with specific risks [44].
Populations with diabetes and prediabetes prevalence have reported increased sedentariness. Higher intake of fruit and vegetables, especially those high in fiber (green leafy, yellow and cruciferous vegetables), is associated with a lower risk of T2D [46]. Nonetheless, reducing sedentariness can be achieved by increasing physical activity levels or taking a combined exercise–dietary change approach.
One year interventions targeting sedentary T2D adults with poor glycemic control and reduced insulin sensitivity have shown that increased step count, measured using wrist accelerometry, can be achieved concurrently with continuous glucose monitoring sensor monitoring [47]. High-risk postmenopausal women with CVD risks have also shown enhanced microvascular endothelial activity with individualized exercise training at VT combined with a Mediterranean dietary approach based on main nine nutritional components [48]. A different physical activity approach was used in younger adults who might be at a different workplace risk, such as university students attending campus-based classes. More intense activities or “HIIT” through game sports and intense exercise sessions were tolerated by such a group, resulting in reduced body mass index and fat percentage, lowered blood pressure and higher cardiorespiratory capacity [45]. Individualized sedentary reduction and physical activity approaches are therefore effective in high-risk populations and induce significant risk-reduction benefits in a cluster of long-term conditions.

2.4. Addressing Weight and Fat Loss Prescription

Determining changes in whole body metabolism is essential in health, disease and sports performance. However, achieving weight and fat loss is often simplified by looking into anthropometric changes in BMI, defined as weight in kilograms divided by the square of height in meters. An arbitrary measure of obesity is BMI > 30 kg.m−2, which, although indicative, does not consider metabolic or vascular status or the changes in response to an intervention. It is not uncommon for a lifestyle intervention, whether exercise or diet, to induce minor or no changes in BMI, but significant metabolic and vascular benefits related to CVD and T2D outcomes [34,35,48,49]. Therefore, weight and fat loss outcomes should always consider complementary indicative measures of the individuals’ cardiometabolic profile, especially measures which combine health and fitness profiles, especially in those with multiple long-term conditions. Examples include combined measurements of gaseous exchange data of V ˙ O 2 and V ˙ C O 2 which can be used to estimate various thresholds including VT and V ˙ O 2 p e a k [43,44].
Data derived from the respiratory gas exchange ratio also allow indirect calorimetry measurements of fatty acid oxidation (FAO) and carbohydrate CHO oxidation (CHO), which provide the main fuel supply for human energy production at rest and during exercise [50,51,52,53]. Impairments in FAO or CHO are known predictors of long-term conditions such as obesity, diabetes and cardiometabolic diseases [50,51]. However, relying on respiratory based calorimetry measures may be insufficient in describing individuals’ metabolic profile, and so adding blood-based biomarkers, especially blood lactate concentration (BLC), to measure metabolism provides a more robust approach in determining metabolic sensitivity and changes in weight and fat loss outcomes and adaptations of multiple cardiometabolic systems [51,52]. Recently validated models of assessing metabolism based on lactate–carbohydrate relationship have sensitively reflected adaptive responses of multiple metabolic characteristics such as muscle fiber composition, glycogen content and activity, gender, diet, aerobic capacity and exercise intensity and duration [52,53]. This model offers an individualized characterization of whole-body metabolism which addresses the large inter-individual and intra-individual variability in fat loss assessment, which are common confounders in measuring adaptations to a lifestyle dietary, or exercise training interventions [52]. Future use of the lactate–carbohydrate predictive model in lifestyle interventions involving multiple long-term conditions merits further research.

3. Conclusions and Prospects

The prevalence of multiple long-term conditions is on the rise across all age groups. The majority of these conditions, including T2D and CVD, can be prevented by lifestyle exercise and nutrition interventions (Figure 1). A person centered lifestyle approach should be adopted and simplified to achieve adherence, especially when intense types of exercise such as HIIT are recommended in high-risk populations. Lifestyle interventions should integrate a component of preventing sedentariness and utilize multiple levels of assessments of both physical fitness and the adaptive metabolic, cardiovascular and respiratory responses. Lifestyle interventions in high-risk children and adolescents with obesity should go beyond achieving weight- and fat-loss outcomes, especially in those with the obesity comorbidity. Predictive models characterizing individuals’ metabolic profiles and the associated whole-body adaptive cardiometabolic responses provide a future scope for the accurate prescription of personalized lifestyle interventions.

Funding

This research received no external funding.

Data Availability Statement

Data are available from the author on request.

Conflicts of Interest

The author declares no conflict of interest.

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Encyclopedia 03 00032 g001 550
Figure 1. Recommendations for lifestyle prevention of multiple long-term conditions.
Figure 1. Recommendations for lifestyle prevention of multiple long-term conditions.
Encyclopedia 03 00032 g001
Table
Table 1. Recommendations based on exercise contribution within lifestyle longitudinal interventions.
Table 1. Recommendations based on exercise contribution within lifestyle longitudinal interventions.
StudyMethodOutcomesPractical Recommendations
Six-month randomized controlled trial involving participants with obesity and prediabetes [18]1-Moderate exercise low volume (walking ~16 km/wk at 50% V ˙ O 2 p e a k );
2-Moderate high volume (walking ~22 km/wk);
3-Vigorous run, high volume (67 km/wk at 75% V ˙ O 2 p e a k )
4-Caloric restriction with low volume exercise.		Diet and exercise induced better FBG. Only Moderate exercise high-volume group improved T2D outcomes(OGTT), better than all other groups (including high-intensity-exercise) with a better compliance.Physical activity recommendation need not to be complex for T2D prevention and can be more effective than high-intensity exercise, with better compliance.
Four years intervention involving high CVD risk individuals diagnosed T2D patients [20]Objective measurement of physical activity while measuring obesity, hypertension and CVD outcomes (waist circumference, blood pressure, CVD risk via cardiorespiratory fitness).Simple intervention aimed at increasing physical activity using accelerometers and reducing sedentariness increased cardiorespiratory fitness and CVD risks.CVD risk in those with T2D can be reduced by a single component intervention aimed at reducing sedentary behavior.
Intensive lifestyle intervention to prevent CVD mortality in Look AHED cohort of 5145 T2D individuals with overweight [21]1 year (within 5 years) with 15 years follow up Intensive calorie restriction weight-loss and increased PA vs. counselling. CVD mortality outcomes (MI/stroke, angina).Improved weight loss (8.6 vs. 0.7% at yr1; 6.0% vs. 3.5% at end), initial fitness, HbA1c. did not reduce CVD mortality (403 vs. 418).Intensive intervention that is good for reducing T2D risks may not be good for CVD mortality. Weight loss caloric restriction may not be a sufficient T2D prevention strategy
Intensive Lifestyle Intervention as above [21] but with categorization of subgroups [22]Same as above, but sample was stratified as four subgroups related to older age at diabetes onset (42% of sample), poor glucose control (14%), severe obesity (24%) and younger age at diabetes onset (20%).CVD risk was not reduced in the poor-glucose-control subgroup (hazard ratio >1.32) but was reduced in all remaining 3 subgroups.T2D preventative interventions in poorly controlled glucose should carefully consider CVD risks. Nutritional intervention component in this group could focus on alternatives to caloric restriction.
CVD, cardiovascular disease; (T2D) type-2 diabetes, OGTT, oral glucose tolerance test; V ˙ O 2 p e a k , peak oxygen uptake; HR, heart rate; PAEE physical activity energy expenditure; PA, physical activity; MVPA, moderate physical activity; CRF, cardiovascular capacity; WC waste circumference; Units are KKW = kJ.kg bw−1.wk−1.
Table
Table 2. Sedentary risks reduced following an individualized exercise training intervention.
Table 2. Sedentary risks reduced following an individualized exercise training intervention.
InterventionWhole GroupMenWomen
AssessmentBeforeAfterBeforeAfterBeforeAfter
BMI27.8 ± 3.927.6 ± 3.628.6 ± 3.628.3 ± 3.327.2 ± 4.227.1 ± 3.9
SBP (mmHg)125.9 ± 17.8124.4 ± 10.6129.1 ± 13.8130.1 ± 8.4124.1 ± 20.0121.3 ± 10.7
DBP (mmHg)78.6 ± 12.579.8 ± 7.283.7 ± 9.780.3 ± 9.775.8 ± 13.379.5 ± 7.2
VT (ml.kg−1.min−1)12.0 ± 2.714.7 ± 2.9 **4.7 ± 1.05.6 ± 0.8 **4.4 ± 1.05.0 ± 0.8 **
VT Velocity (km.h−1)4.5 ± 0.95.2 ± 0.8 **12.7 ± 3.515.8 ± 2.5 **11.54 ± 2.113.97 ± 3.0 *
V ˙ O 2 p e a k (ml.kg−1.min−1)25.7 ± 6.629.3 ± 6.7 *29.4 ± 6.731.6 ± 7.323.2 ± 5.527.7 ± 6.0 *
* Higher after versus before the intervention at p < 0.05. ** Higher after versus before the intervention at p < 0.001. BMI, body mass index; SBP, systolic blood pressure; DBP, diastolic blood pressure, V ˙ O 2 p e a k cardiorespiratory capacity; VT, ventilatory threshold; VT velocity, Velocity at VT (all p < 0.001). Reproduced with permission from [44].
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