Blood lactate responses to leg presses performed against inertial resistance

A flywheel ergometer has been devised which employs gravity-independent inertial resistance. Concentric and eccentric actions, which are integral to weight-bearing and ambulation activities, may be done on this ergometer. However, blood lactate responses to exercise on the ergometer by contractile m...

Full description

Saved in:
Bibliographic Details
Published inAviation, space, and environmental medicine Vol. 77; no. 7; p. 707
Main Authors Caruso, John F, Herron, Jacquelyn C, Capps, Landon B, Coday, Michael A, Ramsey, Charles A, Drummond, Jan L
Format Journal Article
LanguageEnglish
Published United States 01.07.2006
Subjects
Adult
Ergometry
Exercise - physiology
Female
Glycolysis - physiology
Humans
Lactic Acid - blood
Male
Multivariate Analysis
Muscle Contraction - physiology
Online AccessGet more information

Cover

More Information
Summary:A flywheel ergometer has been devised which employs gravity-independent inertial resistance. Concentric and eccentric actions, which are integral to weight-bearing and ambulation activities, may be done on this ergometer. However, blood lactate responses to exercise on the ergometer by contractile mode and training volume are unknown. Workout order was balanced so that subjects performed each type of ergometer leg press workout twice in a nonsequential manner. Per workout, 10 repetitions were performed per set. Workouts were as follows: three sets with concentric and eccentric (CE3) actions, three sets with concentric-only (CO3) actions, and six sets with concentric-only (CO6) actions. Pre- and 5-min post-exercise lactate was measured from a fingertip blood drop. Lactate means were compared with a 2 x 3 (time X workout) ANOVA with repeated measures applied to both independent variables and Scheffe's post hoc test. With body mass and performance measures as predictor variables, multivariate regression attempted to explain post-exercise and delta (post-pre) lactate variance. Post-exercise blood lactate values (mmol x L(-1), mean +/- SEM) were as follows: CE3, 8.08 +/- 0.44; CO3, 7.57 +/- 0.49; and CO6, 6.96 +/- 0.43. CE3 and CO6 workouts produced comparable volumes of work. Though several CE3 performance measures were significantly correlated to post-exercise and delta lactate values, power indices had the strongest relationship. Factors related to lactate production and clearance caused CE3 values to be highest. Power indices were most correlated to lactate as they denote a higher work rate and reliance on glycolysis.
ISSN:0095-6562