High-intensity interval eccentric cycling: Acute and chronic effects

Eccentric cycling training has been prescribed in continuous and low intensities protocols, based on concentric cycling parameters. While the lower metabolic demand of eccentric than concentric cycling is advantageous for clinical or ‘at-risk’ populations, it is a disadvantage for cardiovascular and pulmonary adaptations. High-intensity interval protocols may increase both, strength and endurance. Thus, this research project compared i) an incremental concentric and eccentric cycling test until exhaustion for the relationship between power output and physiological parameters <Study1>; ii) interval and continuous eccentric cycling protocols for oxygen consumption, perceived exertion and enjoyment <Study 2>; and iii) aerobic performance, muscle morphology and function after 8-week interval eccentric versus concentric cycling training <Study 3>. Study 1: Nine men and two women (20-48 y) performed an incremental concentric and eccentric cycling test. Peak power output (PPO) was 53% greater (PStudy 2:The same subjects as those of Study 1 performed continuous cycling at 60% of PPO for 20 min at 60 rpm, and 13.2 min at 90 rpm (CONT13@60%), 4 x 4 min intervals at 75% of PPO with 2 min rest, 12 x 1 min at 100% of PPO with 1 min rest and 10 x 1 min at 150% of PPO with 1 min rest (INT1x10@150%). Total VO2 was the largest (pStudy 3:Eighteen men (19-56 y) performed either eccentric (EC, n=9) or concentric cycling (CC, n=8) twice a week for 8 weeks on an isokinetic cycling ergometer. Intensity was matched for perceived effort, started at 30% and 45%, and increased to 36% and 70% of concentric sprint PPO (10s) for CC and EC, respectively, and progressively increased from 5 x 2 min with a 1-min rest to 7 x 2 min with 30-s rest. The magnitude of increases in quadriceps cross-sectional area, concentric sprint PPO, countermovement and squat jump was greater (P

Grantor dc:publisher

Edith Cowan University, Research Online, Perth, Western Australia

Year dc:date

2018

Author dc:creator

• Lipski, Marcin

• Eccentric exercise
• muscle function
• eccentric muscle action
• muscle lengthening
• strength
• endurance
• Sports Sciences

Repository record dc:identifier

https://ro.ecu.edu.au/theses/2104

OAI identifier oai:identifier

oai:ro.ecu.edu.au:theses-3106