Acute responsiveness to single leg cycling in adults with obesity

The mechanisms through which obesity impacts age-related muscle mass regulation are unclear. In the present study, rates of integrated myofibrillar protein synthesis (iMyoPS) were measured over 48-h prior-to and following a 45-min treadmill walk in 10 older-obese (O-OB, body fat[%]: 33 ± 3%), 10 older-non-obese (O-NO, 20 ± 3%), and 15 younger-non-obese (Y-NO, 13 ± 5%) individuals. Surface electromyography was used to determine thigh muscle “activation”. Quadriceps cross-sectional area (CSA), volume, and intramuscular thigh fat fraction (ITFF) were measured by magnetic resonance imaging. Quadriceps maximal voluntary contraction (MVC) was measured by dynamometry. Quadriceps CSA and volume were greater (muscle volume, Y-NO: 1182 ± 232 cm3; O-NO: 869 ± 155 cm3; O-OB: 881 ± 212 cm3, P < 0.01) and ITFF significantly lower (m. vastus lateralis, Y-NO: 3.0 ± 1.0%; O-NO: 4.0 ± 0.9%; O-OB: 9.1 ± 2.6%, P ≤ 0.03) in Y-NO compared with O-NO and O-OB, with no difference between O-NO and O-OB in quadriceps CSA and volume. ITFF was significantly higher in O-OB compared with O-NO. Relative MVC was lower in O-OB compared with Y-NO and O-NO (Y-NO: 5.5 ± 1.6 n·m/kg−1; O-NO: 3.9 ± 1.0 n·m/kg−1; O-OB: 2.9 ± 1.1 n·m/kg−1, P < 0.0001). Thigh muscle “activation” during the treadmill walk was greater in O-OB compared with Y-NO and O-NO (Y-NO: 30.5 ± 13.5%; O-NO: 35.8 ± 19.7%; O-OB: 68.3 ± 32.3%, P < 0.01). Habitual iMyoPS did not differ between groups, whereas iMyoPS was significantly elevated over 48-h post-walk in O-OB (+ 38.6 ± 1.2%·day−1, P < 0.01) but not Y-NO or O-NO (+ 11.4 ± 1.1%·day−1 and + 17.1 ± 1.1%·day−1, respectively, both P > 0.271). Equivalent muscle mass in O-OB may be explained by the muscle anabolic response to weight-bearing activity, whereas the age-related decline in indices of muscle quality appears to be exacerbated in O-OB and warrants further exploration.

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Greater myofibrillar protein synthesis following weight-bearing activity in obese old compared with non-obese old and young individuals

Morgan

Smeuninx

Marshall

et al. 2023

GeroScience

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Single-leg cycling to maintain and improve function in healthy and clinical populations

Heidorn¹,

Elmer²,

Martin³

et al. 2023

Front. Physiol.

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Exercise with reduced muscle mass facilitates greater muscle-specific adaptations than training with larger muscle mass. The smaller active muscle mass can demand a greater portion of cardiac output which allows muscle(s) to perform greater work and subsequently elicit robust physiological adaptations that improve health and fitness. One reduced active muscle mass exercise that can promote greater positive physiological adaptations is single-leg cycling (SLC). Specifically, SLC confines the cycling exercise to a smaller muscle mass resulting in greater limb specific blood flow (i.e., blood flow is no longer “shared” by both legs) which allows the individual to exercise at a greater limb specific intensity or for a longer duration. Numerous reports describing the use of SLC have established cardiovascular and/or metabolic benefits of this exercise modality for healthy adults, athletes, and individuals living with chronic diseases. SLC has served as a valuable research tool for understanding central and peripheral factors to phenomena such as oxygen uptake and exercise tolerance (i.e., V̇O2peak and V̇O2 slow component). Together, these examples highlight the breadth of applications of SLC to promote, maintain, and study health. Accordingly, the purpose of this review was to describe: 1) acute physiological responses to SLC, 2) long-term adaptations to SLC in populations ranging from endurance athletes to middle aged adults, to individuals living with chronic disease (COPD, heart failure, organ transplant), and 3) various methods utilized to safely perform SLC. A discussion is also included on clinical application and exercise prescription of SLC for the maintenance and/or improvement of health.

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Management of Obesity through Diet and Exercise

Jamil,

Baqir,

Fahim

et al. 2023

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Worldwide, Pakistan is ranked as the 6th most highly populated country. Approximately 1.6 million deaths are due to the health problems associated with obesity. Obesity is the root cause of any health problem and can lead to many serious diseases of the heart, lungs, and kidneys, and can cause death. Lack of physical activity, excessive consumption of food, and unawareness is the main cause of obesity in Pakistan. The obesity ratio of people living in urban areas is more than people living in rural. To describe the different types of exercises and diet plans for losing weight in an obese person. This literature review is written by the collection of many search websites like Google Scholar, Pub Med, Sci-Hub, Centre of Disease Control, etc. It is used to enhance the awareness of weight management interventions with the help of evidence-based practice. Weight reduction can be accomplished by following the standard guidelines and different ways of weight management programs.

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Acute responsiveness to single leg cycling in adults with obesity

Cited by 3 publications

References 70 publications

Greater myofibrillar protein synthesis following weight-bearing activity in obese old compared with non-obese old and young individuals

Greater myofibrillar protein synthesis following weight-bearing activity in obese old compared with non-obese old and young individuals

Single-leg cycling to maintain and improve function in healthy and clinical populations

Management of Obesity through Diet and Exercise

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