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In this study the primary aims are to investigate the effect of resistance exercise training with different degrees of effort on glycemic control and psychological variables in individuals living with type 2 diabetes mellitus. As a secondary aim, investigate adherence and dropout rates and reasons for dropping out and adhering or not to the protocols.
Resistance exercise training can be both effective for the management of type 2 diabetes mellitus (T2DM) and appealing for individuals living with T2DM, and has been shown to be a viable exercise prescription option for this population. It has been suggested that the degree of effort is important for acute improvements in glucose metabolism and insulin sensitivity in individuals living with T2DM, although direct evidence of that is lacking. However, performing resistance exercise sets with a high degree of effort is associated with higher perceived exertion and discomfort, increased muscle soreness, negative perceptual responses, and higher neuromuscular fatigue and muscle damage. Taken together, these negative perceptual and physiological responses to resistance exercise sets performed with high degree of effort might negatively affect enjoyment, self-efficacy, and motivation during a resistance exercise session, ultimately reducing long-term adherence.
The primary aim of this study is to assess the effects resistance exercise training with different degrees of effort on glycemic control and psychological responses in individuals living with T2DM. Also, perceptual responses will be assessed to investigate how feelings experienced during resistance exercise training are altered relative to different degrees of effort. The hypothesis is that glycemic control will not be affected by the degree of effort, and improvements will be observed regardless of that. Also, it is hypothesized that the degree of effort will be associated with better psychological responses. The secondary aim of this study is to investigate and report adherence rate and reasons for adhering or not to the protocols. It is anticipated that adherence will be associated with the degree of effort and psychological responses experienced during training.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| High-effort | Experimental | The high-effort protocol will entail performing 3 sets per exercise, 8 repetitions per set, ~2.5 seconds per repetition, with 120 seconds between sets and exercises. |
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| Low-effort | Experimental | The low-effort protocol will entail performing 6 sets per exercise, 4 repetitions per set, ~2.5 seconds per repetition, with 60 seconds between sets and exercises. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| High-effort resistance exercise training | Behavioral | Six sets per exercise, 8 repetitions per set. |
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| Measure | Description | Time Frame |
|---|---|---|
| Glucose concentration | Average glucose concentration (measured in milligrams per deciliter of blood, with a continuous glucose monitoring device) | For 60 hours before the first training session and for 60 hours after the last (32nd) training session |
| Measure | Description | Time Frame |
|---|---|---|
| Adherence to the resistance training protocols | Adherence rate assessed using the Kaplan-Meier method | From date of randomization until the date of first documented dropout from any cause, assessed up to 16 weeks (the end of the training period) |
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Inclusion Criteria:
Exclusion Criteria:
Temporary exclusions include:
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| Name | Affiliation | Role |
|---|---|---|
| Flavio De Castro Magalhaes, PhD | Assistant Professor | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| UNM Exercise Physiology Lab | Albuquerque | New Mexico | 87131-0001 | United States |
For sharing the data generated the Open Science Framework (OSF) platform will be used. Before data sharing, all personal identifiers will be stripped from the data. Specifically, any direct identifiers (e.g., name, email addresses, phone and cell phone numbers), date identifiers (e.g., birthday, date of disease diagnosis, dates patients participated in data collection), location identifiers (e.g., personal or professional addresses, zip codes), links to external datasets identifiers (e.g., social media accounts) will be removed. Furthermore, participants will be represented by an identification string generated randomly (www.random.org/strings/), and their data will be inserted in the files in a random order, not associated with the order they were enrolled. Thus, data will be entirely de-identified before sharing, in order to protect sensitive personal information and privacy.
The anticipated date for data sharing will be 6 months after publication of data or 18 months after award end date, whatever happens first.
Open access
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| ICF | No | No | Yes | Informed Consent Form | May 22, 2024 | Jun 27, 2024 | ICF_000.pdf |
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Participants will undergo anthropometrics, familiarization, and strength test, and will be randomized to a high-effort, or a low-effort resistance training protocol, that will be carried out 2 days/week, for 16 weeks, and will be composed of 7 exercises (hex bar squat, seated chest press, leg press, lat pulldown, leg extension, shoulder press, leg curl, always in this order). Load will be set at 10-RM load (75% 1-RM). Participants will be instructed to perform the concentric (lifting) phase of the repetition as fast as they can (~0.5 seconds), and to perform the eccentric phase in 2 seconds. Psychological responses (perceived exertion, enjoyment, feeling scale, discomfort, and self-efficacy) will be assessed. Anthropometrics will be repeated after training, and before and after the training period, glycemic control will be assessed via a continuous glucose monitoring device. The main outcomes will be compared between training interventions, pre-training data will used as comparator.
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Data and statistical analysis will be performed by a researcher blinded to groups and participants' identities.
| Low-effort resistance exercise training | Behavioral | Three sets per exercise, 4 repetitions per set. |
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