Neuromuscular and circulatory adaptation during combined arm and leg exercise with different maximal work loads.
Cardiopulmonary kinetics and electromyographic activity (EMG) during exhausting exercise were measured in 8 males performing three maximal combined arm+leg exercises (cA+L). These exercises were performed at different rates of work (mean+/-SD; 373+/-48, 429+/-55 and 521+/-102 W) leading to different average exercise work times in all tests and subjects. VO2 reached a plateau versus work rate in every maximal cA+L exercise (range 6 min 33 s to 3 min 13 s). The three different exercise protocols gave a maximal oxygen consumption (VO2MAX) of 4.67+/-0.57, 4.58+/-0.52 and 4.66+/-0.53 l min(-1) (P=0.081), and a maximal heart rate (HRmax) of 190+/-6, 189+/-4 and 189+/-6 beats min(-1) (P=0.673), respectively. Root mean square EMG (EMGRMS) of the vastus lateralis and the triceps brachii muscles increased with increasing rate of work and time in all three cA+L protocols. The study demonstrates that despite different maximal rates of work, leading to different times to exhaustion, the circulatory adaptation to maximal exercise was almost identical in all three protocols that led to a VO2 plateau. The EMG(RMS) data showed increased muscle recruitment with increasing work rate, even though the HRmax and VO2MAX was the same in all three cA+L protocols. In conclusion, these findings do not support the theory of the existence of a central governor (CG) that regulates circulation and neuronal output of skeletal muscles during maximal exercise.
Brink-Elfegoun
Thibault
T
Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden. thibault.elfegoun@gih.se
Holmberg
Hans-Christer
HC
Ekblom
Maria Nordlund
MN
Ekblom
Björn
B
D000222:Adaptation, Physiological / Q000502:physiology*; D000328:Adult; D015308:Anaerobic Threshold / Q000502:physiology; D001132:Arm / Q000502:physiology*; D004562:Electrocardiography; D004576:Electromyography; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D007866:Leg / Q000502:physiology*; D008297:Male; D018482:Muscle, Skeletal / Q000098:blood supply / Q000294:innervation* / Q000502:physiology*; D010101:Oxygen Consumption / Q000502:physiology; D010807:Physical Endurance / Q000502:physiology; D010809:Physical Fitness / Q000502:physiology; D011652:Pulmonary Circulation / Q000502:physiology; D012039:Regional Blood Flow / Q000502:physiology; D013147:Spirometry
Eur J Appl Physiol. 2003 Aug;89(6):619-23
12759760
J Physiol. 1996 Feb 15;491 ( Pt 1):271-80
9011619
Med Sci Sports Exerc. 2007 Jan;39(1):103-7
17218891
Eur J Appl Physiol. 2002 Jul;87(3):202-6
12111279
Eur J Appl Physiol Occup Physiol. 1999 Aug;80(3):213-9
10453923
Exerc Sport Sci Rev. 2000 Jan;28(1):10-4
11131681
Physiol Rev. 1974 Jan;54(1):75-159
4587247
Br J Sports Med. 2004 Dec;38(6):797-806
15562183
Chest. 1989 Dec;96(6):1312-6
2582837
Respir Physiol. 1996 Feb;103(2):195-202
8833551
Acta Physiol Scand Suppl. 1973;399:1-104
4522516
J Appl Physiol (1985). 2005 Dec;99(6):2453
16342379
Neurosci Lett. 2004 Aug 19;366(3):250-3
15288428
J Appl Physiol (1985). 2004 Jan;96(1):218-25
12972439
Circ Res. 1986 Apr;58(4):523-30
3698218
J Physiol. 1990 Oct;429:17-27
2277345
J Appl Physiol. 1967 Jan;22(1):61-70
6017655
Acta Physiol Scand. 1977 Jul;100(3):288-97
920199
Br J Sports Med. 2005 Jan;39(1):52-62
15618343
Am J Physiol. 1992 Dec;263(6 Pt 2):H1675-81
1481894
Br J Sports Med. 2006 Jul;40(7):573-86; discussion 586
16799110
J Physiol. 1985 Sep;366:233-49
4057091
Brain Res. 1969 Sep;15(1):291-4
5807778
J Exp Biol. 2003 Mar;206(Pt 6):1075-83
12582149
Med Sci Sports Exerc. 2000 Jan;32(1):85-8
10647533
J Appl Physiol (1985). 2007 Feb;102(2):781-6
17068219
J Appl Physiol. 1961 Nov;16:977-81
13863012
J Appl Physiol. 1976 Aug;41(2):191-6
956101
Scand J Med Sci Sports. 2000 Jun;10(3):123-45
10843507
J Appl Physiol. 1972 Apr;32(4):516-22
5026501
J Exp Biol. 2001 Sep;204(Pt 18):3225-34
11581338
J Physiol. 1983 Jul;340:335-46
6887053
J Appl Physiol. 1976 Mar;40(3):379-83
931852
Neurosci Lett. 1986 Aug 4;68(3):327-33
3748459
Br J Sports Med. 2005 Sep;39(9):655-60; discussion 660
16118305
Eur J Appl Physiol. 2003 Oct;90(3-4):411-9
12883902
J Physiol. 1991;440:497-512
1839558
Eur J Appl Physiol. 2003 Oct;90(3-4):420-9
12910345
Med Sci Sports Exerc. 1994 Nov;26(11):1319-26
7741865
Med Sci Sports Exerc. 1998 Sep;30(9):1381-98
9741607
J Appl Physiol (1985). 2000 Jul;89(1):305-13
10904066
J Appl Physiol. 1955 Jul;8(1):73-80
13242493
Med Sci Sports Exerc. 1997 May;29(5):571-90
9140893
J Appl Physiol. 1975 Jul;39(1):71-5
1150596
Circulation. 1974 Dec;50(6):1179-89
4430113
J Appl Physiol. 1974 May;36(5):515-8
4826311
J Appl Physiol (1985). 1990 Jan;68(1):404-10
2312484