Changes in Muscle Activity and Kinematics of Highly Trained Cyclists During Fatigue

Changes in Muscle Activity and Kinematics of Highly Trained Cyclists During Fatigue

Muscle fatigue may alter kinematics and contribute to repetitive strain injuries. This study quantified how both localized muscle fatigue and movement kinematics change over time during exhaustive cycling. Seven highly trained cyclists rode a stationary bicycle ergometer at 100% of their maximum oxy...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on biomedical engineering Vol. 55; no. 11; pp. 2666 - 2674
Main Authors: Dingwell $^\ast$, Jonathan B., Joubert, Jason E., Diefenthaeler, Fernando, Trinity, Joel D.
Format: Journal Article
Language:English
Published: United States IEEE 01-11-2008
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Adolescent
Adult
Analysis of Variance
Bicycles
Bicycling
Biomechanical Phenomena
Capacitive sensors
Coordination
cross-correlation
cycling
Electromyography
electromyography (EMG)
Exercise Test
Extremities
Fatigue
Fluctuations
Frequency
Humans
Injuries
Kinematics
Male
muscle fatigue
Muscle Fatigue - physiology
Muscle, Skeletal - physiology
Muscles
Muscular system
Physical Endurance
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Muscle fatigue may alter kinematics and contribute to repetitive strain injuries. This study quantified how both localized muscle fatigue and movement kinematics change over time during exhaustive cycling. Seven highly trained cyclists rode a stationary bicycle ergometer at 100% of their maximum oxygen consumption ( VO 2 max) until voluntary exhaustion. Cycling kinematics and electromyography (EMG) activity from select lower extremity muscles were recorded. Cross-correlations were computed to quantify how EMG median frequencies (MDFs) changed with changes in movement kinematics. All athletes maintained both cadence and power output for ~ 90% of the trial duration. Significant sustained muscle fatigue occurred in 18 of 28 muscles tested, most prominently in the biceps femoris ( p = 0.020) and gastrocnemius ( p = 0.018). Kinematics and MDF both fluctuated nonmonotonically as subjects fatigued. Changes in MDF significantly preceded changes in mean trunk lean ( p = 0.009) and hip angles ( p = 0.025), and trunk lean range of motion ( p = 0.029). Fluctuations in MDF were positively correlated with fluctuations in mean trunk lean ( p = 0.009 ) and knee splay angles ( p = 0.011), and with trunk lean ( p = 0.002) and ankle ( p = 0.001) range of motion. These results therefore establish a direct link between changes in muscle fatigue state and subsequent changes in movement kinematics during cycling.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ObjectType-Article-1
ObjectType-Feature-2
ISSN:0018-9294
1558-2531
DOI:10.1109/TBME.2008.2001130