DEPARTMENTS: ACSM Newsbriefs
ECCENTRIC VERSUS CONCENTRIC CYCLING EXERCISE
A recent article published in the September 2013 issue of Medicine & Science in Sports & Exercise ® examined metabolic and muscle damage profiles of eccentric cycling. In contrast to traditional cycling, muscles lengthen during eccentric cycling when resisting against the motor-driven backward rotational movement of the pedals. In this study, eccentric cycling (60% of maximal concentric workload) was compared with concentric cycling (CONC), and muscle damage and soreness (i.e., DOMS) were assessed after initial and repeated eccentric bouts (ECC1 and ECC2).
Ten healthy men performed the three cycling bouts for 30 minutes 2 weeks apart. Heart rate (HR), oxygen consumption (VO2), blood lactate (BLa), rate of perceived exertion (RPE), and muscle activity data were recorded. Maximal knee extensor strength (MVC), jump height, and DOMS also were measured before, immediately after, and 1 to 4 days after exercise.
Cardiovascular stress (HR, VO2, BLa, RPE) significantly was lower during ECC1 (19%, 50%, 65%, and 22%, respectively) and ECC2 (29%, 51%, 71%, and 23%, respectively) than CONC. Muscle activity also was lower during ECC1 and ECC2 than CONC. Although MVC and jump height were lower and DOMS was greater after ECC1 than CONC, ECC2 did not affect MVC and jump height and elicited no DOMS.
Therefore, muscle damage is minimalafter the secondbout and should not affect the choice to exercise. These findings confirm that eccentric cycling is less demanding metabolically than CONC and, because it provides greater hypertrophic and strength stimulus to muscles, it could be an ideal exercise for those with disease or lower cardiorespiratory fitness.
MARK YOUR CALENDAR FOR ACSM’s 2014 HEALTH & FITNESS SUMMIT & EXPOSITION
Before your know it, it will be time for ACSM’s Health & Fitness Summit & Exposition. Mark your calendars now for April 1 to 4, 2014. The 2014 Summit will be held in Atlanta, GA. Stay tuned to www.acsmsummit.org for more details.
APPLY FOR THE LAWRENCE A. GOLDING SCHOLARSHIP
The Lawrence A. Golding Scholarship is being offered for the ninth consecutive year. The scholarship is designed to recognize publicly undergraduate students who are in their sophomore, junior, or senior year, who have made significant outstanding contributions to their communities in the areas of health, fitness, and/or education.
Healthy Learning™ underwrites this scholarship, granting two $1,000 awards. The recipients also receive complimentary registration to ACSM’s 2014 Health & Fitness Summit & Exposition to be held April 1 to 4, 2014, in Atlanta, GA. Visit www.acsmsummit.org to apply this fall.
GET READY: WORLDWIDE FITNESS TRENDS SURVEY RESULTS ARE COMING!
The eighth annual worldwide survey results will be released in the November/December 2013 issue of ACSM’s Health & Fitness Journal®. See which health and fitness trends will be ranked in the top 20 for 2014 and read expert commentary on the results. The winners of the prize drawing also will be announced.