Sex Effects on Blood Pressure Regulation to Acute Isometric Handgrip Exercise, Following 4 Weeks of Isometric Handgrip Training
University of Massachusetts, Boston
Summary
The goal of this intervention is to compare the blood pressure response of young females and males to a single bout of static handgrip exercise before and after static handgrip training (4 weeks). The main questions this study aims to answer are: * Are the lowering blood pressure effects of static handgrip exercise training different between young females and males? * Which factors explain the lowering blood pressure effects of static handgrip training and possible differences between sexes? Is it an improved blood vessel dilation? Is it a reduced stiffening of blood vessels? Is it a reduced fight or flight response resulting in a lower heart rate and blood pumped by the heart into the vessels? All the above? * Which factors regulate blood pressure response during and immediately after a single bout of static handgrip exercise? All participants will be asked to: * Visit the laboratory to perform static handgrip exercise - first visit; * Participants will be randomized (like flipping a coin) to static handgrip exercise training or to a non-exercising phase, with each phase lasting four weeks. Participants will also complete the other condition (handgrip or no handgrip) after completing the first four-week condition * Return to the laboratory after the completion of both static handgrip training and no training to perform the static handgrip exercise of the first visit. The investigators will compare participants' blood pressure response to a single bout static of handgrip exercise after training to their own blood pressure response to the same bout of exercise after the non-training period.
Description
Hypertension is still the leading modifiable risk factor for cardiovascular disease and a silent independent predictor of all-cause death worldwide. Projections for the US suggest that 41% of adults will develop hypertension before 2030. Thus, it is clinically relevant to optimize interventions aimed at preventing and managing hypertension. Isometric handgrip training holds promise to mitigate the growing prevalence of hypertension in healthy adults. This form of exercise training can be performed at home, requires less time investment compared to conventional training, and requires only one…
Eligibility
- Age range
- 18–40 years
- Sex
- All
- Healthy volunteers
- Yes
Inclusion Criteria: * Ages between 18-40 years; * Normal blood pressure as defined by the American Heart Association (\<130/90 mmHg); * BMI \< 30 kg/m2; * No cardiovascular risk factors and no clinically diagnosed cardiovascular disease; * Being recreationally active (≤ 2 days of structured physical activity); * Able to speak English. Exclusion Criteria: * Diagnosed with cardiovascular disease (e.g., coronary artery disease, heart failure), musculoskeletal (i.e., osteoporosis and sarcopenia), metabolic disease (e.g., diabetes mellitus) and kidney disease; * Taking antihypertensive or other…
Interventions
- OtherIsometric handgrip training
Participants will train three days per week at home for 1 month using a reliable and validated digital handgrip dynamometer (DynX, MD System, Inc., Westerville, USA) in a seated position. The isometric handgrip training protocol will consist of four sets (2 for each hand) of two-min sustained contractions starting at 30% of maximum voluntary contraction (MVC) interspersed by 1-min resting periods (a total of 12-min). All training sessions will be remotely supervised via Zoom or phone call by a research team member to ensure compliance with the exercise prescription. Before each training session, MVCs will be re-assessed over three repetitions, each separated by 30-s, to ensure an accurate exercise prescription. The highest value will be used to determine the target intensity of the session
Locations (2)
- UMassachusetts BostonBoston, Massachusetts
- University of Massachusetts BostonBoston, Massachusetts