Cerebral Oxygenation Dynamics During Incremental Exercise: Comparison of Arm Cranking and Leg Cycling

2021 ◽  
pp. 125-130
Author(s):  
K. Hashimoto ◽  
K. Hotta ◽  
S. Morishita ◽  
R. Kanai ◽  
H. Takahashi ◽  
...  
Keyword(s):  
Cerebral Oxygenation ◽  
Incremental Exercise ◽  
Arm Cranking ◽  
Leg Cycling

Anaerobic threshold and maximal aerobic power for three modes of exercise

1976 ◽  
Vol 41 (4) ◽  
pp. 544-550 ◽  
Author(s):  
J. A. Davis ◽  
P. Vodak ◽  
J. H. Wilmore ◽  
J. Vodak ◽  
P. Kurtz
Keyword(s):  
Gas Exchange ◽  
Anaerobic Threshold ◽  
Venous Blood ◽  
Incremental Exercise ◽  
Vo2 Max ◽  
Gas Exchange Parameters ◽  
Arm Cranking ◽  
College Age ◽  
Significant Difference ◽  
Leg Cycling

Alterations in selected respiratory gas exchange parameters have been proposed as sensitive, noninvasive indices of the onset of metabolic acidosis(anaerobic threshold (AT) during incremental exercise. Our purposes were toinvestigate the validity and feasibility of AT detection using routine laboratory measures of gas exchange, i.e., nonlinear increases in VE and VCO2 and abrupt increases in FEO2. Additionally, we examined the comparability ofthe AT and VO2 max among three modes of exercise (arm cranking, leg cycling, and treadmill walk-running) with double determinations obtained from 30 college-age, male volunteer subjects. The AT's for arm cranking, leg cycling, and treadmill walk-running occurred at 46.5 +/- 8.9 (means +/- SD), 63.8 +/- 9.0, and 58.6 +/- 5.8% of VO2 max, respectively. No significant difference was found between the leg exercise modes (cycling and walk-running) forthe AT while all pairwise arm versus leg comparisons were significantly different. Using nine additional subjects performing leg cycling tests, a significant correlation of r = 0.95 was found between gas exchange AT measurements (expressed as % VO2 max) and venous blood lactate AT measurements (% VO2 max). We conclude that the gas exchange AT is a valid and valuable indirect method for the detection of the development of lactic acidosis during incremental exercise.

scholarly journals Cardiovascular Responses to Electrical Stimulation-Induced Leg Cycling Versus Voluntary Arm Cranking Exercise

2004 ◽  
Vol 36 (Supplement) ◽  
pp. S60
Author(s):  
Thomas W. Janssen ◽  
Laurien M. Buffart ◽  
Nina M.C. Mathijssen ◽  
A. Peter Hollander ◽  
Christof A.J. Smit ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Cardiovascular Responses ◽  
Arm Cranking ◽  
Leg Cycling ◽  
Arm Cranking Exercise

Cardiovascular Responses to Electrical Stimulation-Induced Leg Cycling Versus Voluntary Arm Cranking Exercise

2004 ◽  
Vol 36 (Supplement) ◽  
pp. S60
Author(s):  
Thomas W. Janssen ◽  
Laurien M. Buffart ◽  
Nina M.C. Mathijssen ◽  
A. Peter Hollander ◽  
Christof A.J. Smit ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Cardiovascular Responses ◽  
Arm Cranking ◽  
Leg Cycling ◽  
Arm Cranking Exercise

253 PHYSIOLOGIC RESPONSES TO ARM CRANKING AND ELECTRICAL STIMULATION LEG CYCLING, PART I: PARAPLEGICS

1990 ◽  
Vol 22 (2) ◽  
pp. S43 ◽  
Author(s):  
S. P. Hooker ◽  
S. F. Figonl ◽  
R. M. Glaser ◽  
M. M Rodgers ◽  
P. D. Faghri ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Arm Cranking ◽  
Leg Cycling ◽  
Physiologic Responses

Effects of acute hypoxia on cerebral and muscle oxygenation during incremental exercise

2007 ◽  
Vol 103 (1) ◽  
pp. 177-183 ◽  
Author(s):  
Andrew W. Subudhi ◽  
Andrew C. Dimmen ◽  
Robert C. Roach
Keyword(s):  
Power Output ◽  
Repeated Measures ◽  
Near Infrared ◽  
Cerebral Oxygenation ◽  
Vastus Lateralis ◽  
Acute Hypoxia ◽  
Incremental Exercise ◽  
Muscle Oxygenation ◽  
Peak Power Output ◽  
Vastus Lateralis Muscle

To determine if fatigue at maximal aerobic power output was associated with a critical decrease in cerebral oxygenation, 13 male cyclists performed incremental maximal exercise tests (25 W/min ramp) under normoxic (Norm: 21% FiO2) and acute hypoxic (Hypox: 12% FiO2) conditions. Near-infrared spectroscopy (NIRS) was used to monitor concentration (μM) changes of oxy- and deoxyhemoglobin (Δ[O2Hb], Δ[HHb]) in the left vastus lateralis muscle and frontal cerebral cortex. Changes in total Hb were calculated (Δ[THb] = Δ[O2Hb] + Δ[HHb]) and used as an index of change in regional blood volume. Repeated-measures ANOVA were performed across treatments and work rates (α = 0.05). During Norm, cerebral oxygenation rose between 25 and 75% peak power output {Powerpeak; increased (inc) Δ[O2Hb], inc. Δ[HHb], inc. Δ[THb]}, but fell from 75 to 100% Powerpeak {decreased (dec) Δ[O2Hb], inc. Δ[HHb], no change Δ[THb]}. In contrast, during Hypox, cerebral oxygenation dropped progressively across all work rates (dec. Δ[O2Hb], inc. Δ[HHb]), whereas Δ[THb] again rose up to 75% Powerpeak and remained constant thereafter. Changes in cerebral oxygenation during Hypox were larger than Norm. In muscle, oxygenation decreased progressively throughout exercise in both Norm and Hypox (dec. Δ[O2Hb], inc. Δ [HHb], inc. Δ[THb]), although Δ[O2Hb] was unchanged between 75 and 100% Powerpeak. Changes in muscle oxygenation were also greater in Hypox compared with Norm. On the basis of these findings, it is unlikely that changes in cerebral oxygenation limit incremental exercise performance in normoxia, yet it is possible that such changes play a more pivotal role in hypoxia.

Comparison of hemodynamic responses to static and dynamic exercise

1982 ◽  
Vol 53 (6) ◽  
pp. 1589-1593 ◽  
Author(s):  
G. R. Bezucha ◽  
M. C. Lenser ◽  
P. G. Hanson ◽  
F. J. Nagle
Keyword(s):  
Arterial Pressure ◽  
Pressor Response ◽  
Peripheral Resistance ◽  
Bicycle Ergometer ◽  
Open Circuit ◽  
Dynamic Exercise ◽  
Arm Cranking ◽  
Hemodynamic Responses ◽  
Leg Extension ◽  
Leg Cycling

Eight healthy male adults (25–34 yr) were studied to compare hemodynamic responses to static exercise (30% MVC in leg extension), static-dynamic exercise (one-arm cranking, 66 and 79% VO2 max-arm), and dynamic exercise (two-leg cycling, 58 and 82% VOmax-legs). Leg extension (LE) strength was measured by a spring scale. Cranking and cycling were performed on a Quinton bicycle ergometer. VO2 was measured using an automated open-circuit system. Heart rate (HR) was monitored from a CM-5 ECG lead, and arterial pressure (Pa) was measured from an indwelling brachial artery catheter. Cardiac output (Q) was measured using a CO2-rebreathing procedure. Total peripheral resistance (TPR) was calculated using the mean arterial pressure (Pa) as the systemic pressure gradient. In 30% LE, a significant (P less than 0.05) Pa increase occurred (pressor response) mediated primarily by an increase in Q. One-arm cranking and two-leg cycling at similar relative VO2 demands resulted in nearly identical increases in Pa due to different contributions of Q and TPR. Q and the arteriovenous O2 difference varied as a function of VO2 regardless of the mode of exercise (static or dynamic). On the other hand, the HR response, which accounted for increased Q in the exercises containing a static component, and Pa varied with mode of exercise. Any generalized scheme of cardiovascular control during exercise must account for the potential influence of dynamic and static components of the exercise.

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