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Ann Rehabil Med > Volume 45(5); 2021 > Article
Mustapa, Justine, Latir, and Manaf: Home-Based Physical Activity in Patients With Type 2 Diabetes Mellitus: A Scoping Review

Abstract

To promote optimal healthcare delivery in type 2 diabetes mellitus (T2DM) following the outbreak of coronavirus disease 2019, adopting home-based physical activity (PA) is being seriously considered. Therefore, this study aims to outline the characteristics of exercise protocols for home-based PA and the challenges and limitations in implementing home-based PA in patients with T2DM. This scoping review was carried out by identifying eligible studies in six different databases (Scopus, Cochrane Library, SpringerLink, ProQuest, Science Direct, and Google Scholar). The keywords used in the search strategies were: home-based physical activity, home-based exercise therapy, home-based physical exercise, home-based exercise, home-based exercise training, diabetes mellitus, and T2DM. Two reviewers independently screened all full-text articles to find articles that met the eligibility requirements. A total of 443 articles were identified in the search. Approximately 342 articles were excluded by screening titles and abstracts, which led to the selection of 44 articles relevant to the current study. Further screening of the full-text led to the subsequent removal of 34 other articles, leading to 10 studies that were eligible for data extraction. This review suggested that the exercise protocols for home-based PA include resistance exercise using free weight and own body weight with a frequency of two to three sessions per week at moderate intensity, along with aerobic exercise (particularly walking) with a frequency of three to five times per week at moderate intensity. A combination of resistance and aerobic exercise showed more significant benefits of PA in patients with T2DM. More studies regarding home-based PA in T2DM patients with metabolic disorders are warranted.

INTRODUCTION

Type 2 diabetes mellitus (T2DM) is a chronic and debilitating metabolic disease that accounts for 90% to 95% of all diabetes cases [1-3]. T2DM has a complex pathology, with hyperglycemia having a significant impact on metabolic and vascular factors, as well as genetic and environmental factors [4]. Driven by the impacts of prolonged hyperglycemia, numerous deleterious long-term complications on morbidity have been reported in diabetic patients [3-6]. Studies have shown that prolonged inactivity may significantly impact the pathogenesis of inflammation, which might explain the existence of substantial metabolic and cardiovascular complications in T2DM [7,8].
In addition, the coronavirus disease 2019 (COVID-19) pandemic has emphasized the significant susceptibility in individuals with pre-existing comorbidities such as T2DM [9]. Driven by complex factors such as immune system deficiencies and hyperglycemia, studies have shown that individuals with pre-existing comorbidities are predisposed to the deleterious impacts of COVID-19, such as viral proliferation and severe inflammatory reactions of the upper respiratory tract [9,10]. Therefore, physical activity (PA) is constituted as a fundamental approach to combat the progressive pathologies of COVID-19 in patients with T2DM [9,10], prevent the complications of DM, and offer protection against the detrimental impacts of inactivity.
PA is defined as any unstructured bodily movement (self-selected leisure activity) that leads to greater energy expenditure than in rest [11,12]. The word of PA and exercise is used interchangeably. However, exercise is expressed as a structured PA (planned intentionally) which is intended to improve health and/or physical fitness [11,12]. Current international guidelines have recommended that diabetic patients should perform regular PA with at least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity aerobic exercise along with resistance exercise for three days per week [3,13]. Compared with the aerobic or resistance exercise alone, the combination of aerobic and resistance exercise is proven to have a synergistic and incremental effect on glycemic control as well as decrease risk of cardiovascular complications and overall mortality among T2DM patients [9,12].
Studies have shown that regular PA among patients with T2DM in nationwide representative samples remains low to moderate, ranging from 30% to 60% [14-16]. Furthermore, current stringent lockdown orders following the COVID-19 pandemic have caused the majority of diabetic patients to become physically inactive [17-19]. In Poland, about 34% of 124 diabetic patients are inactive compared with 21% before the COVID-19 pandemic [17]. Therefore, considering that “staying at home” has been the essential recommendation for individuals with chronic comorbidities, further studies on the necessity of home-based PA during the COVID-19 outbreak are needed.
To the best of our knowledge, no previous reviews on home-based PA in patients with T2DM have been conducted, yet the heterogeneity of home-based PA protocols has been testified [20-22]. On the basis of this evidence, the present study aimed to (1) conduct a systematic search of published studies on home-based PA, (2) map out the characteristics of exercise protocols for home-based PA, (3) evaluate the effects of home-based PA on the investigated outcome measures, and (4) examine the adherence, challenges, and limitations in implementing home-based PA in T2DM patients.

MATERIALS AND METHODS

Study design

The protocol of this review has been registered within the Open Science Framework (https://osf.io/3djzp). This scoping review was carried out by using a standardized methodological framework [23]. The identification and screening process for article selection were conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) [24].

Search strategy

Electronic-based searches were performed in six different databases (Scopus, Cochrane Library, SpringerLink, ProQuest, Science Direct, and Google Scholar) to identify studies that describe home-based PA interventions delivered to T2DM patients (Supplement A). A comprehensive search of studies was conducted in January 2021 (updated June 2021). No date restrictions were imposed in the search strategy. The keywords and Boolean operators used in the search were as follows: “home-based physical activity” OR “home-based exercise therapy” OR “homebased physical exercise” OR “home-based exercise” OR “home-based exercise training” OR “aerobic exercise” OR “resistance exercise” AND “diabetes mellitus” OR “type 2 diabetes mellitus” AND NOT “type 1 diabetes mellitus” OR “gestational diabetes mellitus”.

Eligibility criteria

Articles or studies that focused on home-based PA and/or exercise with any design (except systematic and narrative reviews), setting, or duration were included in this study. Studies were excluded if they were (1) not reported in the English language and (2) did not include human subjects.

Study selection

Two reviewers independently screened all citations and full-text articles retrieved using the above literature search strategy to identify articles that met the eligibility criteria. Discrepancies between reviewers were resolved by consensus. Finally, two reviewers independently extracted data from the selected articles.

Data extraction

The extracted data from the selected articles are summarized in Table 1. Information regarding the effects of home-based PA on the investigated outcome measures is listed in Table 2.

RESULTS

A PRISMA-ScR flow diagram showing the stages of article screening and selection is shown in Fig. 1. A total of 443 articles were identified in the search. Briefly, about 342 articles were excluded on the basis of the initial screening of titles and abstracts, leading to the selection of 44 articles that were potentially relevant to the current study. Further screening of the full-text led to the subsequent removal of 34 other articles, resulting in a total of 10 studies that were eligible for data extraction [20-22,25-31].
Table 1 shows the characteristics of the included studies. Only seven studies were randomized controlled trials [21,22,25,26,28-30]. In total, 477 T2DM patients were divided into the intervention and control groups, with sample sizes ranging from n=16 to n=40 and n=13 to n=44, respectively (except the study of Shinji et al. [31]). The duration of interventions ranged from 4 weeks to an average of 17.2 months. Four studies included diabetes education, including a healthy eating plan, health counselling, and diabetes self-management prior to the intervention [21,26,27,31]. One study further instructed the participants to gradually increase their PA until they achieved 150 minutes per week [27]. Eight studies delivered the exercise demonstration and instruction in the study setting [20-22,25,26,28-30], while two studies used videotape [27] and gave verbal exercise prescription [31] before the intervention.
Aside from supervised sessions at the beginning of the intervention, eight studies included a supervised element either via home visit by the researcher or hospital visit by the participants on more than one occasion throughout the duration of the intervention [20-22,25,26,28-30]. However, two studies were considered unsupervised and maintained contact with their participants by phone or email to keep track of their activities [27,31]. On the other hand, the study of Dunstan et al. [21] implemented two phases of supervised and home-based resistance exercise.

Exercise protocols

The number of studies that reported on each of the following principles (FITT) is as follows: frequency 10/10, intensity 9/10, time 5/10, and type 10/10. Eight studies followed the standard international guidelines of the FITT principles of exercise protocol, two studies did not follow the recommendation in conducting aerobic exercise, which was limited to 70 minutes per week [20], and did not report the amount of aerobic exercise with frequency of at least 1 day per week [22]. Eight studies prescribed two to five sessions of resistance exercise per week [20-22,25-29]. Five studies prescribed three to six sessions of aerobic exercise per week [26-28,30,31].
Five studies used 1 repetitive maximum (1RM) in identifying the appropriate intensity for resistance exercise and started with 50%–60% of 1RM [20,28], progressing to 70%–95% [21,22,29]. These studies also prescribed two sets of resistance exercise with 8 to 15 repetitions, then progressing to three sets with 90–120 seconds rest between sets [20-22,28,29]. Four studies prescribed moderate- intensity aerobic exercise on basis of the maximum heart rate [20], talk test [26], maximum oxygen uptake (VO2 max), and the Borg scale [28,30]. Meanwhile, one study implemented low- to moderate-intensity aerobic exercise [27]. Shinji et al. [31] adjusted the intensity of aerobic exercise on the basis of the anaerobic threshold. Only one study did not report the intensity of aerobic exercise [22].
In the aspect of time, three studies implemented 30–45 minutes of resistance exercise, excluding warm-up and cool-down [20,21,25]. Five studies started with 10–15 minutes of aerobic exercise, excluding warm-up and cool-down, with a gradual increase to 45 minutes at the end of the intervention [20,27,28,30,31]. Two studies did not report the time or duration of exercise [22,29].
In the aspect of type, five studies used a combination of resistance and aerobic exercises [20,22,26-28]. Three studies employed resistance exercise only for the intervention [21,25,29]. Two studies used aerobic exercise only for the intervention [30,31].
The mode of aerobic exercise varied from walking dependent on the speed [20,26,27,30,31] to orienteering/ hiking/dancing [22], which are categorized as unstructured PA. However, one study did not report the mode of aerobic exercise included in the intervention [28]. Six studies incorporated resistance exercise using free weight, such as resistance band, ankle weight, and dumbbell, and own body weight in resistance exercise with standardized frequency and intensity [20,21,25,26,28,29],which are categorized as structured PA. One study did not report the mode of resistance exercise [22].

Effects of home-based PA on the investigated outcome measures

The most commonly reported outcome measures were the level of glycosylated hemoglobin (HbA1c) and fasting blood glucose (FBG) for glycemic control, body mass index (BMI) and waist and hip circumference for body composition, muscle strength, quality of life (QoL), and level of PA. Four studies showed statistically significant improvement in HbA1c regardless of combined exercise and resistance exercise alone [20-22,28], and four other studies showed non-significant improvement in HbA1c post-intervention [25-27,29]. However, the study of Dunstan et al. [21] showed a significant improvement in HbA1c during the supervised resistance training, but it was not maintained in home-based resistance training. The study by Rekha et al. [30] is the only one that measured glycemic control using FBG, instead of HbA1c, and found significant improvement in FBG after aerobic exercise.
One study found significant improvement of BMI in combined exercise [26], four studies showed non-significant improvement of BMI regardless of combined exercise and exercise alone [22,25,27,29], and one study found no improvement of BMI in combined exercise [20]. The study by Dunstan et al. [21] found significant improvement in body weight during the supervised resistance training and maintained improvement in home-based training. Waist and hip circumference were non-statistically improved in four studies [22,25,26,29] and two studies [25,29], respectively. The study by Dunstan et al. [21] showed significant improvement of waist circumference during the supervised resistance training, but it was not maintained in home-based training. Muscle strength was examined using 1RM [20,21,29] and handgrip dynamometers [25]. Three studies showed significant improvement in muscle strength after combined exercise and resistance exercise alone [20,21,29]. By contrast, one study showed no significant improvement in handgrip strength [25]. The study by Dunstan et al. [21] reported significant improvement in muscle strength during the supervised resistance training and maintained improvement in home-based training. Four studies did not report muscle strength in conducting the resistance exercise [22,26-28].
Several questionnaires were used in assessing the QoL, such as Short Form 12 [29], Short Form 36 (SF-36) [20,25,26], Health-Related Quality of Life [22], and Diabetes-Specific Quality of Life questionnaire (DSQoL) [30]. Except for general health and physical items [25,26], five studies demonstrated improvement in QoL although it was not significant [20,25-27-29]. Two studies reported significant improvement in QoL after the combined exercise and aerobic exercise alone [22,30]. Metabolic outcomes such as lipid profile and insulin resistance have also been investigated [20,22,26,28,29]. Two studies reported significant improvement in lipid profile after combined exercise [26,28], and three studies reported no significant improvement in lipid profile regardless of combined exercise and resistance exercise alone [20,22,29]. Three studies assessed the level of PA before the exercise training using the Active Australia Questionnaire [25], self-reported habitual PA [21], and 10-item Physical Functioning Scale [27]. These studies found no significant improvement in the level of PA postintervention [21,25,27]. Only one study examined flexibility, balance, and functional mobility using Chair Sit and Reach, Single Leg Balance, and Timed Up and Go, respectively [25]. The study by Shinji et al. [31] evaluated the incidence of cardiovascular disease (CVD) with the adherence of PA. This study found that adherence to exercise is associated with a reduced incidence of CVD.

Adherence, challenges, and limitations

In general, six studies indicated good adherence of participants with the home-based training ranging from 63% to 96% [20-22,25,26,29]. One study found that 12 patients (38%) in the intervention group achieved at least 80% or more of the prescribed exercise regardless of the supplemental videotape as an exercise aid [27]. Two studies did not report adherence [28,30]. The study by Shinji et al. [31] included participants who attended more than four sessions per week for data analysis.
Additionally, five studies reported no significant adverse events or injuries during the intervention [20-22,27,29], five studies did not report the adverse events of home-based PA [25,26,28,30,31]. Nevertheless, Plotnikoff et al. [29] reported that eight patients in the exercise group presented with musculoskeletal injuries of the knee, shoulder, back, and backside that impaired their ability to perform some of that diminished their compliance to the exercise.
Meanwhile, Dadgostar et al. [26] reported challenges and limitations of home-based training, such as loss of motivation because of reduced supervision and consultation throughout the intervention. However, this study further emphasized the usage of exercise aid such as pedometers to improve PA [26]. Additionally, regular telephone calls is an effective strategy in maintaining adherence [22]. Poor education on the specific dietary component was also postulated as one of the challenges and limitations of home-based PA [27]. Three studies did not state the challenges and limitations of home-based training [28,30,31].

DISCUSSION

This scoping review provided a synthesis of the exercise protocols for home-based PA in patients with T2DM. Overall, the majority of included studies adopted a combination of resistance and aerobic exercises in their intervention. The combination of resistance and aerobic exercises for home-based PA led to improvements in glycemic control, muscle strength, and QoL [20,22,28]. In most home-based PA studies, resistance exercise was performed in accordance with standardized guidelines (i.e., using free weight and own body weight with a frequency of 2–3 sessions per week at moderate intensity with 8–10 repetitions for 2–3 sets) [20,21,26,28]. The use of free weight in resistance exercise is highly recommended in home and community settings [32]. We found that enrolment of resistance exercise only in home-based PA is an effective method to increase muscle strength and QoL, but it did not significantly improve glycemic control [25,26,29]. This is supported by the fact that resistance exercise induces a hypertrophic response and a shift of muscle-fiber type in exercising muscles [33]. Nevertheless, Cheung et al. [25] found no significant increase in muscle strength, probably because of insufficient measurement for handgrip value and focus of resistance exercise on the back, upper arm, and leg regions. Perhaps 1RM strength assessment using standardized protocols may provide a better consistent measure of strength.
Along with resistance exercise, the majority of studies conducted aerobic exercise at a frequency of three to five times per week at moderate intensity lasting for a minimum of 15 minutes or a maximum of 45 minutes excluding warm-up and cool-down each session [26-28,30]. Particularly, walking is the most feasible type of unstructured PA and widely used in the therapeutic regime, especially in obese, middle-aged, and elderly patients with T2DM [12,34]. Performance of aerobic exercise only significantly improved glycemic control. However, adequate frequency and timing of walking are critical in improving the metabolic profile [35]. Likewise, a higher training frequency (at least 3 days per week) or longer durations of exercise can lead to better glycemic control in T2DM patients through greater muscle glycogen usage and glycogen repletion rate [36].
By contrast, we found that the study of Aylin et al. [20] conducted an inadequate amount of aerobic exercise, which resulted in significant glycemic control. This study further postulated that a combination of supervised resistance and home-based aerobic exercise may induce improvement in glycemic control. Similarly, the study by Ferrer-Garcia et al. [22] found that engaging in both resistance and aerobic exercises leads to improved glucose control despite the inadequate frequency of aerobic exercise. Correspondingly, combined aerobic and resistance exercise training may increase the rate of glucose infusion and glucose disposal, which leads to better glycemic control [37]. Thus, our findings support a previous review [38] suggesting that a combination of resistance and aerobic exercise shows more significant benefits of PA in patients with T2DM. We also found a non-significant improvement of lipid profile in the study by Aylin et al. [20]. The low frequency of aerobic exercise may lead to the poor outcome of lipid profile.
In addition, the patient’s safety is a vital aspect in the prescription of home-based PA. The present review found that most previous studies did not report any major injuries and adverse events throughout the intervention, which is an encouragement for maintaining homebased PA in T2DM patients [20-22,27]. Despite the good outcomes of home-based PA, most studies reported that patient’s adherence and compliance to the interventions are the limitations of home-based training [20-22,25,29]. This finding is in accordance with the study by Dunstan et al. [21], which found a failure in maintaining the gymnasium-based improvements during the home-based phase. Therefore, the maintenance of supervision and contact and supplementary exercise aid are crucial throughout the intervention to encourage adherence and compliance toward home-based PA.
The lack of demonstration and supervision might also contribute to the poor outcome of home-based training [22]. Therefore, personalized supervision in home-based structured PA is crucial in ensuring that T2DM patients achieve the current international guidelines and exercise protocols [39]. A home visit may also help educate T2DM patients to integrate PA in an unsupervised home environment [40]. In brief, the home-based PA approach in T2DM is highly favorable, and strict actions should be taken to address its limitations and barriers.
Poor education on the prescription of home-based PA by healthcare professionals may also hinder the adherence of home-based PA [41]. Therefore, the recommendation of counselling or detailed education sessions on PA by physicians during follow-up appointments and personalized interventions play an essential part in T2DM management. The prescription of home-based PA should be implemented on the basis of tailored interventions owing to obesity and physical inactivity in most patients with T2DM [16]. Thus, pre-screening for the correct techniques of PA is necessary prior to the implementation of home-based PA.
This study has limitations. First, the statistics comparison of the effects of the exercise methods between combined exercise and resistance or aerobic exercise alone was limited due to the small number of included papers. Second, we did not conduct a formal evaluation of the methodological quality and distinction of study design of the included studies as the purpose of a scoping review is to provide a more comprehensive overview of the available evidence [42]. However, studies involving diabetes education, health counselling, routine diet guidance, and psychological counselling components may have avoided definitive conclusions about home-based PA alone. Therefore, the majority of studies involving home-based PA utilized multiple therapeutic approaches. It is not easy to design an effective home-based PA particularly in T2DM patients with metabolic disorders. Thus, future studies should adopt transparent and consistent exercise principles in the recommendation of home-based PA related to activities of daily living (ADLs) in T2DM patients with metabolic disorders.

CONCLUSION

This review summarizes the characteristics of home-based PA in patients with T2DM. This review suggests that exercise protocols for home-based PA should include resistance exercise using free weight and own body weight with a frequency of 2–3 sessions per week at moderate intensity with 8–10 repetitions for 2–3 sets, along with aerobic exercise (particularly walking) with a frequency of 3–5 times per week at moderate intensity lasting for a minimum of 15 minutes or a maximum of 45 minutes. The performance of combined resistance and aerobic exercise is highly beneficial for patients with T2DM. More studies regarding home-based PA related to ADLs in T2DM patients with metabolic disorders are warranted.

CONFLICTS OF INTEREST

No potential conflict of interest relevant to this article was reported.

AUTHOR CONTRIBUTION

Conceptualization: Amirah M. Methodology: Amirah M, Haidzir M. Formal analysis: Amirah M, Haidzir M. Funding acquisition: None. Project administration: Amirah M, Maria J, Haidzir M. Visualization: Amirah M. Writing - original draft: Amirah M. Writing - review and editing: Amirah M, Maria J, Haidzir M, Alif AL. Approval of final manuscript: all authors.

ACKNOWLEDGMENTS

The authors thank IIUM and UiTM, Malaysia for funding this research through the IIUM-UMP-UITM Sustainable Research Gollaboration Grant 2020 (SRCG) (IIUM/504/G/14/3/1/1/SRCG20-0049) and Geran Kolaborasi Entiti Penyelidikan UiTM (KEPU) 2021(600-RMC/KEPU 5/3 (001/2021).

SUPPLEMENTARY MATERIALS

Supplementary materials can be found via http://doi.org/10.5535/arm.21102.
Supplement A.
Searching databases
arm-21102-suppl.pdf

Fig. 1.
A Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) flow diagram. T1DM, type 1 diabetes mellitus; DPN, diabetic peripheral neuropathy.
arm-21102f1.jpg
Table 1.
Characteristics of the included studies
Study, year Study design Participant characteristics
Study period (mo) Exercise intervention Exercise protocol
Supervision/contact Exercise aids
Type Sample size Mean age (yr) Sex (M/F) Freq . session per week Intensity/volume Time per session (min)a) Type/mode
Aylin et al. [20], 2009 PS NA HB: 18 51.39±2.02 15/3 2 Supervised RE and HB AE 2 50%-60% 1RM 35 RE: Shoulder flexion (sandbag); biceps curl, triceps kickback (dumbbell); hip flexion and abduction, knee extension and flexion (ankle weight); sit up Supervised RE NA
8-10 reps/2 sets
CG: 18 (no exercise) 56.06±1.48 12/6 2 60-79% HR max 10 → 35 AE: Walking Weekly phone call Log quest and feedback
IM: HR
Cheung et al. [25], 2009 Pilot RCT Sedentary HB: 20 59±8.7 7/13 4 HB RE 5 12 reps/2 sets 30 Chest press, back rows, leg press, triceps, and biceps curls (dynabands); leg abductions and extension (body weight) Supervised (5 session in 2 week of 1st m → monthly visit) Diary
CG: 17 (no exercise) 62±6.7 5/12
Dadgostar et al. [26], 2016 RCT NA HB: 36 50.21±5.47 F 3 Supervised RE and HB AE 3 Low (red) → high intensity (blue) NA RE: Shoulder girdle, biceps, triceps, chest, abdomen, back, quadriceps, hamstring and calf muscles (theraband) Supervised RE (3 session/week in 1st 6 week → 1 session/week in 2nd 6 week Pedometer and activity log
10-15 reps/2-3 sets
CG: 36 (no exercise) 49.06±5.81 3-5 2,500-3,000 → 10,000-12,000 steps/day) NA AE: Walking
IM: talk test
Dunstan et al. [21], 2005 RCT Sedentary, elderly, and OW HB: 16 67.6±5.2 10/6 12 1st phase: Supervised RE 3 50%-60% 1RM → 75%-85% 1RM 45 Supervised RE: Bench press, leg extension, upright row, lateral pulldown, leg curl (ankle weights); shoulder press, biceps curl, triceps kickback (dumbbell); abdominal curls Supervised RE NA
2nd phase: HB RE 8-10 reps/3 sets
CG: 13 66.9±5.3 6/7 3 60%-80% 1RM NA HB RE: Lying dumbbell flies; single-leg extension (ankle weights); shoulder press, bent-over row, upright row, bicep curls, triceps kickbacks (dumbbell); leg curl (ankle weights); abdominal curls Home visit in 1st week Diary, exercise booklet, log quest and feedback
8-10 reps/3 sets Weekly phone call in 1st m → 1 phone call in 2 week
Monthly hospital visit
Ferrer-Garcia et al. [22], 2011 RCT Elderly HB: 44 65.59±7.6 18/26 6 HB RE and AE 2 75%-95% 1RM NA RE: Different circuit of big muscle groups 3 clinic visits in baseline, 3rd m, and 6th m NA
3 × phone call
2 visits for diet and exercise compliance
CG: 40 (exercise education) 67.86±8.44 16/24 1 NA NA AE: Orienteering hikes, dancing, games, etc.
Krousel-Wood et al. [27], 2008 FS Sedentary HB: 37 56.6±9.6 24/52 3 HB RE and AE 5 Low→moderate 10 → 30 RE and AE: Exercise similar to ADL (e.g. walking) Weekly emailed activity log Videotape, activity log, and pedometer
CG: 39 (no exercise)
Liu et al. [28], 2015 RCT NA HB: 22 52.6±11.43 12/10 3 HB RE and AE 3 40% VO2 max → 60% VO2 max 10 → 35 AE: NA Supervised AE (3-10 sessions in the beginning) NA
IM: Borg scale Monthly hospital visit
Weekly phone call
CG: 20 (no exercise) 51.2±11.34 7/13 2-3 50%-60% 1RM NA RE: Using elastic band
8-10 reps/2 sets
IM: Borg scale
Plotnikoff et al. [29], 2010 RCT Sedentary and obese HB: 27 55±12 8/9 4 HB RE 3 50%-60% 1RM → 85% 1RM NA RE: Core: squats, seated row, chest press, shoulder press; complementary: lunges, lateral pull-down, triceps extension, pulley abdominal twists, biceps curl, triceps press, reverse rhomboid flies, lateral pulley deltoid raise and pulley abdominal curls Home supervised 3 sessions in 1st 2 week → 2 sessions in 2nd 2 week → weekly in 2nd m → 1 session in 2 week of 3rd m Activity log
8-10 reps/2-3 sets
CG: 21 (no exercise) 54±12 8/13
Rekha et al. [30], 2014 RCT NA HB: 28 43.38±5.74 13/15 1 HB AE 5 12-14 Borg scale 30 AE: Brisk walking Weekly hospital visit Activity log
CG: 25 (no exercise) 44±6.36 14/11
Shinji et al. [31], 2007 PS NA HB: 64 58.3±9.8 40/24 Avg. 17.2 HB AE 4-6 Anaerobic threshold 20-30 AE: Daily walking Phone call NA

Values are presented as mean±standard deviation.

ADL, activities of daily living; AE, aerobic exercise; CG, control group; FS, feasibility study; HB, home-based; HR, heart rate; IM, intensity monitoring; NA, not available; OW, overweight; PS, prospective study; Quest, questions; Reps, repetitions; RE, resistance exercise; RM, repetitive maximum; →, progression to.

a) Do not include warm-up or cool-down periods.

Table 2.
Effects of home-based PA on the investigated outcome measures
Study, year Exercise intervention Outcome measures
Main findings Adherence/dropouts (%/%) Significant adverse events
Glycemic control Body composition Physical performance QoL Others
Aylin et al. [20], 2009 Combined HbA1c BMI RM SF-36 Lipid HbA1c and muscle strength improveda) 96/5 No
FBG FBG, QoL, and lipid improvedb)
No improvement in BMI
Cheung et al. [25], 2009 RE HbA1c BMI Handgrip SF-36 PA (AAQ) HbA1c, body composition, physical performance, and level of PA improvedb) 90/7.5 Not reported
Waist and hip C TUG
CSR QoL improvedb) except general health itema)
SLB
Dadgostar et al. [26], 2016 Combined HbA1c BMI NA SF-36 Lipid BMI, body fat, lipid improveda) 77.8/27 Not reported
FBG Body fat PA (step count) HbA1c, FBG, waist circumference, gluteal girth, and level of PA improvedb)
Waist C QoL improvedb) except general health and physical itema)
Gluteal girth
Dunstan et al. [21], 2005 RE HbA1c Weight RM NA IS FBG, muscle strength, IS, and level of PA improvedb) 88/19 No
FBG Body fat Habitual PA Muscle strength improvedc)
LBM HbA1c, and body composition improvedd)
Waist C
Ferrer-Garcia et al. [22], 2011 Combined HbA1c BMI NA HRQoL Lipid HbA1c, FBG, and QoL improveda) 63/12 No
BBG Waist C BMI, waist circumference, and lipid improvedb)
Krousel-Wood et al. [27], 2008 Combined HbA1c BMI NA PF-10 BP HbA1c, BMI, QoL, and BP improvedb) 80% in 12 participants/19 No
Liu et al. [28], 2015 Combined HbAlc NA NA NA Lipid HbA1c, PBG, lipid, IR, and inflammatory markers improveda) Not reported/0 Not reported
PBG IR
Inflammatory markers
Plotnikoff et al. [29], 2010 RE HbAlc BMI RM SF-12 Lipid HbA1c, FBG, BMI, waist and hip circumference, QoL, |lipid, improvedb) 71/15 No
FBG Waist and hip C Insulin
SE Muscle strength and SE improveda)
Rekha et al. [30], 2014 AE FBG NA NA DSQoL NA FBG and QoL improveda) Not reported/3.8 Not reported
Shinji et al. [31], 2007 AE NA NA NA NA CVD Adherence to exercise is associated with a reduced incidence of CVD Attended 4 sessionse)/37.3 Not reported

AAQ, Active Australia Questionnaire; AE, aerobic exercise; BMI, body mass index; BP, blood pressure; Combined, combined resistance and aerobic exercises; C, circumference; CSR, Chair Sit and Reach; CVD, cardiovascular disease; DSQoL, diabetic specific quality of life questionnaire; FBG, fasting blood glucose; HbA1c, glycosylated hemoglobin; HRQOL, health-related quality of life; IR, insulin resistance; IS, insulin sensitivity; LBM, lean body mass; NA, not assessed; PA, physical activity, PBG, postprandial blood glucose; PF-10, 10-item Physical Functioning Scale; QoL, quality of life; RM, repetitive maximum; SE, self-efficacy; SF-12, Short Form 12; SF-36, Short Form 36; SLB, single leg balance; TUG, Timed Up and Go.

a) Significant improvement in the exercise group post-intervention.

b) No significant improvement in the exercise group post-intervention.

c) Significant improvement in the exercise group and maintained in home-based post-intervention.

d) Significant improvement in the exercise group but not maintained in home-based post-intervention.

e) Participants attended more than 4 sessions per week were subjected for data analysis.

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