Abstract
We hypothesized that a bout of high or low volume eccentric exercise would protect against muscle damage following a subsequent high volume bout and that adaptation would be attributable to neural changes, independent of the initial exercise volume. Sixteen males performed either 45 (ECC45) or 10 (ECC10) maximal eccentric contractions using the elbow flexors, followed by an ECC45 bout 2 weeks later. Damage markers were measured for the following 96 h; EMG and work done during the first 10 eccentric contractions were also recorded. CK, soreness, and decrements in MVC and range of motion (ROM) were greater in bout 1 than bout 2 (p < 0.01). Soreness, MVC and ROM were greater after the initial ECC45 bout compared to the initial ECC10 bout and the repeated bouts of ECC45 exercise in both groups (p < 0.01). Median frequency decreased from bout 1 to bout 2 (p < 0.001), no differences between groups were observed. An ECC45 bout of maximal eccentric exercise causes more initial damage than an ECC10 bout of maximal eccentric exercise, although both confer protection from subsequent ECC45 bouts of maximal eccentric contractions, which are attributable, at least in part, to a shift in the frequency content of EMG.
Key words
muscle damage - adaptation - EMG - repeated bout effect
References
-
1
Armstrong R B.
Initial events in exercise-induced muscular injury.
Med Sci Sports Exerc.
1990;
22
429-435
-
2
Brown S J, Child R B, Day S H, Donnelly A E.
Exercise-induced skeletal muscle damage and adaptation following repeated bouts of eccentric muscle contractions.
J Sports Sci.
1997;
15
215-222
-
3
Byrne C, Eston R G, Edwards R HT.
Characteristics of isometric and dynamic strength loss following eccentric exercise-induced muscle damage.
Scand J Med Sci Sports.
2001;
11
134-140
-
4
Chen T C.
Effects of a second bout of maximal eccentric exercise on muscle damage and electromyography activity.
Eur J Appl Physiol.
2003;
89
115-121
-
5
Crameri R M, Langberg H, Teisner B, Magnusson P, Schroder H D, Olesen J L, Jensen C H, Koskinen S, Suetta C, Kjaer M.
Enhanced procollagen processing in skeletal muscle after a single bout of eccentric loading in humans.
Matrix Biol.
2004;
23
259-264
-
6
DeLuca C J.
The use of surface electromyography in biomechanics.
J Appl Biomech.
1997;
13
35-163
-
7
Ebbeling C B, Clarkson P M.
Exercise-induced muscle damage and adaptation.
Sports Med.
1989;
7
207-234
-
8
Farina D, Merletti R, Enoka R.
The extraction of neural strategies from the surface EMG.
J Appl Physiol.
2004;
96
1486-1495
-
9
Fridén J, Sjostrom M, Ekblom B.
A morphological study of delayed muscle soreness.
Experientia.
1981;
37
506-507
-
10
Fridén J, Sjostrom M, Ekblom B.
Myofibrillar damage following intense eccentric exercise in man.
Int J Sports Med.
1983;
4
170-176
-
11
Hough T.
Ergographic studies in muscular soreness.
Am J Appl Physiol.
1902;
7
76-92
-
12
Howell J N, Fuglevand A J, Walsh Bigland-Richie M CB.
Motor unit activity during isometric and concentric-eccentric contractions of the human first interosseus muscle.
J Neurophysiol.
1995;
74
901-904
-
13
Howatson G, van Someren K A.
Ice massage: effects on exercise-induced muscle damage.
J Sports Med Phys Fitness.
2003;
43
500-505
-
14
Howatson G, Gaze D, van Someren K A.
The efficacy of ice massage in the treatment of exercise-induced muscle damage.
Scand J Med Sci Sports.
2005;
15
416-422
-
15
LaStayo P, Ewy G, Pierotti D, Johns R, Lindstedt S.
The positive effects of negative work: increased muscle strength and decreased fall risk in a frail elderly population.
J Gerontol A Biol Med Sci.
2003;
58 A
419-424
-
16
Lieber R L, Fridén J.
Morphological and mechanical basis of delayed-onset muscle soreness.
J Am Acad Orthop Surg.
2002;
10
67-73
-
17
Mair J.
Tissue release of cardiac markers: from physiology to clinical applications.
Clin Chem Lab Med.
1999;
37
1077-1084
-
18
McHugh M P, Connolly D AJ, Eston R G, Gleim G W.
Exercise-induced muscle damage and potential mechanisms for the repeated bout effect.
Sports Med.
1999;
27
157-170
-
19
McHugh M P, Connolly D AJ, Eston R G, Gartman E J, Gleim G W.
Electromyographic analysis of repeated bout effect.
J Sports Sci.
2001;
19
163-170
-
20
McHugh M P.
Recent advances in the understanding of the repeated bout effect against muscle damage from a single bout of eccentric exercise.
Scand J Med Sci Sports.
2003;
13
88-97
-
21
Nardone A, Romano C, Schieppat M.
Selective recruitment of high threshold motor units during voluntary lengthening of active muscle.
J Physiol.
1989;
409
451-471
-
22
Nosaka K, Clarkson P M.
Variability in serum creatine kinase response after eccentric exercise of the elbow flexors.
Int J Sports Med.
1995;
120-127
-
23
Nosaka K, Clarkson P M, McGuiggan M E, Byrne J M.
Time course of muscle adaptation after high force eccentric exercise.
Eur J Appl Physiol.
1991;
63
70-76
-
24
Nosaka K, Sakamoto K, Newton M, Sacco P.
How long does the protective effect on eccentric exercise-induced muscle damage last?.
Med Sci Sports Exerc.
2001;
33
1490-1495
-
25
Nosaka K, Sakamoto K, Newton M, Sacco P.
The repeated bout effect of reduced-load eccentric exercise on elbow flexor muscle damage.
Eur J Appl Physiol.
2001;
85
34-40
-
26
Nosaka K, Newton M, Sacco P.
Responses of human elbow flexor muscles to electrically stimulated forced lengthening exercise.
Acta Physiol Scand.
2002;
174
137-145
-
27
Nosaka K, Newton M, Sacco P.
Delayed-onset muscle soreness does not reflect the magnitude of eccentric exercise-induced muscle damage.
Scand J Med Sci Sports.
2002;
12
337-346
-
28
Warren G L, Lowe D A, Armstrong R B.
Measurement tools used in the study of eccentric contraction-induced injury.
Sports Med.
1999;
27
43-59
-
29
Warren G L, Hermann K M, Ingalls C P, Masselli M R, Armstrong R B.
Decreased EMG median frequency during a second bout of eccentric contractions.
Med Sci Sports Exerc.
2000;
32
820-829
-
30
Yu J G, Carlsson L, Thornell L E.
Evidence for myofibril remodeling as opposed to myofibril damage in human muscles with DOMS: an ultrastructural and immunoelectron microscopic study.
Histochem Cell Biol.
2004;
121
219-227
PhD Glyn Howatson
St Mary's College
School of Human Sciences
Strawberry Hill
Twickenham
United Kingdom
eMail: howatsong@smuc.ac.uk
