Isometric knee extension increased cardiovascular loads in both sexes, with males exhibiting a greater rise in systolic blood pressure and a significant reduction in intraocular pressure.
Does a 1 min sustained maximal-effort isometric knee extension task elicit sex-specific intraocular pressure and retinal vessel responses in healthy young adults?
Maximal-effort isometric knee extension increases cardiovascular load in both sexes, with males showing greater SBP increases and IOP reductions, though both sexes experience similar shifts in retinal microvascular regulation.
Tasa de eventos absoluta: 0% vs 0%
Purpose: Evidence on the safety of single-joint isometric exercises of the lower legs remains limited. Thus, the aims of this study were to examine intraocular pressure (IOP) and retinal vessel responses during a 1 min isometric knee extension task and to assess potential sex-related differences. Materials and Methods: This prospective, parallel-group, quasi-experimental exploratory trial enrolled 43 healthy young adults (22 males and 21 females; age range: 19–35 years), who performed a 1 min sustained maximal-effort isometric knee extension task. The cardiovascular response, IOP, and retinal vessel diameters were assessed. Results: The isometric task increased fatigue, heart rate, systolic blood pressure (SBP), and mean arterial pressure in both sexes (p < 0.05), with males exhibiting a significantly greater rise in SBP than females (p < 0.05). A significant reduction in IOP was observed only in males (p < 0.05). Central retinal arteriolar equivalent decreased in both sexes (p < 0.05), whereas central retinal venular equivalent (CRVE) increased exclusively in females (p < 0.05). Despite the difference in the CRVE response, both sexes exhibited a comparably reduced arteriolar-to-venular diameter ratio (p < 0.05). Conclusions: To sum up, the isometric maximal-effort knee extension exercise increased cardiovascular loads in both sexes, with males showing a greater SBP rise and a reduction in IOP. Although retinal microvascular responses were sex specific, both sexes showed a similar reduction in the arteriolar-to-venular diameter ratio, indicating a consistent shift in microvascular regulation.
Vieversytė-Dvylienė et al. (Thu,) reported a other. Isometric knee extension increased cardiovascular loads in both sexes, with males exhibiting a greater rise in systolic blood pressure and a significant reduction in intraocular pressure.