Physiological responses in different intensities of resistance exercise - Critical load and the effects of aging process

Author(s):Show less -

Arakelian, Vivian Maria ^{[1, 2]} ; Goulart, Cassia da Luz ^[1] ; Mendes, Renata Goncalves ^[1] ; de Sousa, Nuno Manoel ^{[1, 3]} ; Trimer, Renata ^[1] ; Guizilini, Solange ^{[4, 5]} ; Malosa Sampaio, Luciana Maria ^[6] ; Baldissera, Vilmar ^[3] ; Arena, Ross ^[7] ; Reis, Michel S. ^{[8, 9]} ; Borghi-Silva, Audrey ^{[7, 1, 2]}

Affiliation

^[1] Univ Fed Sao Carlos, UFSCar, Dept Fisioterapia, Lab Fisioterapia Cardiopulmonar, Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, EESC FMRP IQSC, Programa Posgrad Interunidades Bioengn, Sao Carlos, SP - Brazil

^[3] Univ Fed Sao Carlos, UFSCar, Dept Ciencias Fisiol, Lab Fisiol Exercicio, Sao Carlos, SP - Brazil

^[4] Univ Fed Sao Paulo, Phys Therapy Sch, Dept Human Mot Sci, Sao Paulo - Brazil

^[5] Univ Fed Sao Paulo, Escola Paulista Med, Sao Paulo Hosp, Cardiol & Cardiovasc Surg Disciplines, Sao Paulo - Brazil

^[6] Nove de Julho Univ, Rehabil Sci Masters Program, Sao Paulo - Brazil

^[7] Univ Illinois, Coll Appl Hlth Sci, Dept Phys Therapy, Chicago, IL - USA

^[8] Univ Fed Rio de Janeiro, Fac Med, Cardioresp Rehabil GECARE, Rio de Janeiro - Brazil

^[9] Univ Fed Rio de Janeiro, Fac Med, Dept Phys Therapy, Rio de Janeiro - Brazil

• Document type: Journal article
• Source: JOURNAL OF SPORTS SCIENCES; v. 37, n. 12, p. 1420-1428, JUN 18 2019.
• Web of Science Citations: 0

Abstract

Aim was to identify critical load (CL) in young and elderly apparently healthy male cohorts. To contrast the metabolic, cardiovascular and perceptual responses on CL according to age. We evaluated 12 young (23 +/- 3 years) and 10 elderly (70 +/- 2 years) apparently healthy active males, who underwent: (1) 1 repetition maximum (1RM) test on a 45 degrees Leg Press; (2) on different days, three high-intensity resistance exercise constant load tests (60%, 75% and 90% 1RM) until fatigue (Tlim). Absolute values of both the CL asymptote and curvature constant (kg) were significantly lower in elderly subjects (P < 0.05). In contrast, elderly subjects demonstrated a significantly higher number of repetitions at CL when compared with young subjects (P < 0.05). As expected, oxygen uptake (VO2) and heart rate (HR) during maximal aerobic exercise testing were significantly reduced in older subjects. However, percent-predicted aerobic capacity were higher in older subjects (P < 0.05). In addition, blood lactate ({[}La-]) corrected to Tlim and rating of perceived exertion values were greater in younger subjects at all intensities (P < 0.05). These findings, despite reduced force production in older subjects, endurance-related parameters are well preserved according to age-adjusted percent-predicted values in apparently healthy males. (AU)

• FAPESP's process: 09/01842-0 - Analysis of central and peripheral muscle metabolism and adjustments on dynamic versus resistance exercise in coronary arterial disease patients: effects of resistance physical training program based on anaerobic threshold by different methodologies
• Grantee: Audrey Borghi Silva
• Support Opportunities: Research Grants - Young Investigators Grants