scholarly journals Effects of acute and chronic interval sprint exercise performed on a manually propelled treadmill on upper limb vascular mechanics in healthy young men

2016 ◽  
Vol 4 (13) ◽  
pp. e12861 ◽  
Author(s):  
T. Dylan Olver ◽  
Steph M. Reid ◽  
Alan R. Smith ◽  
Mair Zamir ◽  
Peter W. R. Lemon ◽  
...  
Keyword(s):  
Upper Limb ◽  
Young Men ◽  
Vascular Mechanics ◽  
Sprint Exercise

Androgen Responses to Sprint Exercise in Young Men

2010 ◽  
Vol 31 (05) ◽  
pp. 291-297 ◽  
Author(s):  
F. Derbré ◽  
S. Vincent ◽  
B. Maitel ◽  
C. Jacob ◽  
P. Delamarche ◽  
...  
Keyword(s):  
Young Men ◽  
Sprint Exercise

Dihydrotestosterone is elevated following sprint exercise in healthy young men

2013 ◽  
Vol 114 (10) ◽  
pp. 1435-1440 ◽  
Author(s):  
Alan A. Smith ◽  
Rebecca Toone ◽  
Oliver Peacock ◽  
Scott Drawer ◽  
Keith A. Stokes ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Venous Blood ◽  
Young Men ◽  
Free Testosterone ◽  
Total Testosterone ◽  
Cycle Exercise ◽  
Skeletal Muscle Function ◽  
Sprint Exercise ◽  
Rate Maximum ◽  
Repeat Sprint

Dihydrotestosterone (DHT) exerts both functional and signaling effects extending beyond the effects of testosterone in rodent skeletal muscle. As a primer for investigating the role of DHT in human skeletal muscle function, this study aimed to determine whether circulating DHT is acutely elevated in men following a bout of repeat sprint exercise and to establish the importance of training status and sprint performance to this response. Fourteen healthy active young men (V̇o2max61.0 ± 8.1 ml·kg body mass−1·min−1) performed a bout of repeat sprint cycle exercise at a target workload based on an incremental work-rate maximum (10 × 30 s at 150% Wmaxwith 90-s recovery). Venous blood samples were collected preexercise and 5 and 60 min after exercise. Five minutes after exercise, there were significant elevations in total testosterone (TT; P < 0.001), free testosterone (FT; P < 0.001), and DHT ( P = 0.004), which returned to baseline after 1 h. Changes in DHT with exercise (5 min postexercise − preexercise) correlated significantly with changes in TT ( r = 0.870; P < 0.001) and FT ( r = 0.914; P < 0.001). Sprinting cadence correlated with changes in FT ( r = 0.697; P = 0.006), DHT ( r = 0.625; P = 0.017), and TT ( r = 0.603; P = 0.022), and habitual training volume correlated with the change in TT ( r = 0.569, P = 0.034). In conclusion, our data demonstrate that DHT is acutely elevated following sprint cycle exercise and that this response is influenced by cycling cadence. The importance of DHT in the context of exercise training and sports performance remains to be determined.

Reflex Responses in Upper Limb Muscles to Cutaneous Stimuli

1993 ◽  
Vol 20 (04) ◽  
pp. 271-278 ◽  
Author(s):  
R. Chen
Keyword(s):  
Stimulus Intensity ◽  
Upper Limb ◽  
Healthy Subjects ◽  
Voluntary Contraction ◽  
Cutaneous Reflexes ◽  
Focal Lesions ◽  
Normal Ranges ◽  
Conduction Velocities ◽  
Limb Muscles ◽  
Biphasic Responses

ABSTRACT:Cutaneous reflexes in the upper limb were elicited by stimulating digital nerves and recorded by averaging rectified EMG from proximal and distal upper limb muscles during voluntary contraction. Distal muscles often showed a triphasic response: an inhibition with onset about 50 ms (Il) followed by a facilitation with onset about 60 ms (E2) followed by another inhibition with onset about 80 ms (12). Proximal muscles generally showed biphasic responses beginning with facilitation or inhibition with onset at about 40 ms. Normal ranges for the amplitude of these components were established from recordings on 22 arms of 11 healthy subjects. An attempt was made to determine the alterent fibers responsible for the various components by varying the stimulus intensity, by causing ischemic block of larger fibers and by estimating the afferent conduction velocities. The central pathways mediating these reflexes were examined by estimating central delays and by studying patients with focal lesions

Mangling upper limb injuries in industry

Injury ◽  
1999 ◽  
Vol 30 ◽  
pp. S
Author(s):  
D RING
Keyword(s):  
Upper Limb ◽  
Limb Injuries
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