Role of sex and training characteristics on exercise effects on cardiovascular aging: protocol for a systematic review with meta-analysis of randomized trials oleh Emmanuel Gomes Ciolac, Jana Babjakova, Raphael Martins de Abreu, Su-Jie Mao, Guoping Qian, Vanessa Teixeira do Amaral, Bartlomiej Wrzesinski, Artur Junio Togneri Ferron, Zbigniew Ossowski, Fabiane Valentini Francisqueti-Ferron, Seda Cansu Yeniğün, Bianca Fernandes, Luis Monteiro Rodrigues, Rahima Gabulova, the PhysAgeNet (Network on Evidence-Based Physical Activity in Old Age)