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Papers by Yagesh Bhambhani

Research paper thumbnail of Oxygen Pulse Predicts Stroke Volume During Wheelchair Racing in Trained Males with Quadriplegia 484

Medicine and Science in Sports and Exercise, May 1, 1997

Research paper thumbnail of Validity of Breathing Frequency to Monitor Exercise Intensity in Trained Cyclists

International Journal of Sports Medicine, May 1, 1995

This study compared breathing frequency (fB) during a ventilation threshold (VT) test with fB dur... more This study compared breathing frequency (fB) during a ventilation threshold (VT) test with fB during a simulated 40 km time trial (40TT) to assess whether fB can be used to monitor exercise intensity. Twenty-six male cyclists (mean +/- SD VO2max = 4.42 +/- 0274 l.min-1) performed an incremental VT ergometer test and a simulated 40TT on a set of wind-loaded rollers. During the 40TT, expired gas was collected for 3 min using open circuit spirometry at 10 km intervals. A significant correlation (r = 0.89; p < or = 0.05) was found between the fB threshold (VTf) and the gas exchange VT (VTg) (3.42 +/- 0.08 and 3.31 +/- 0.09 l.min-1, respectively). No differences were found in VO2 at the VTf vs. X VO2 (3.48 +/- 0.08 l.min-1) during the simulated 40TT. However, when fB in br.min-1 calculated from the VT test (32.5 br.min-1), was compared with fB during the 40TT (45.6 br.min-1), there was a significant difference. Ventilation, heart rate and the respiratory exchange ratio were all significantly higher during the 40TT. Although a significant relationship was found between the VT test and the 40TT for VTf measured in l.min-1 of VO2 (r = 0.66; p < or = 0.05), fB in br.min-1 obtained from the incremental test should not be used to identify exercise training intensity. These data suggest that during competition, trained athletes exercise at a higher fB than that determined when being tested, implying that fB in br.min-1 may not be a valid measurement of exercise intensity.

Research paper thumbnail of Vastus medialis muscle oxygenation trends during a simulated 20-km cycle time trial

European Journal of Applied Physiology, Sep 1, 2001

In this study we examined the oxygenation trend of the vastus medialis muscle during sustained hi... more In this study we examined the oxygenation trend of the vastus medialis muscle during sustained high-intensity exercise. Ten cyclists performed an incremental cycle ergometer test to voluntary exhaustion [mean (SD) maximum oxygen uptake 4.29 (0.63) l x min(-1); relative to body mass 60.8 (2.4) ml x kg(-1)min(-1)] and a simulated 20-km time trial (20TT) on a wind-loaded roller system using their own bicycle (group time = 23-31 min) in two separate sessions. Cardiorespiratory responses were monitored using an automated metabolic cart and a wireless heart rate monitor. Tissue absorbency, which was used as an index of muscle oxygenation, was recorded simultaneously from the vastus medialis using near-infrared spectroscopy. Group mean values for oxygen uptake, ventilation, heart rate, respiratory exchange ratio, power output, and rating of perceived exhaustion were significantly (P < or = 0.05) higher during the incremental test compared to the 20TT [4.29 (0.63) l x min(-1) vs 4.01 (0.55) l x min(-1), 120.4 (26) l x min(-1) vs 97.6 (16.1) l x min(-1), 195 (8) beats x min(-1) vs 177 (9) beats min(-1), 1.15 (0.06) vs 0.93 (0.06), 330.1 (31) W vs 307.2 (24.5) W, and 19 (1.5) vs 16 (1.7), respectively]. Oxygen uptake and heart rate during the 20TT corresponded to 93.5% and 90.7%, respectively, of the maximal values observed during the incremental test. Comparison of the muscle oxygenation trends between the two tests indicated a significantly greater degree of deoxygenation during the 20TT [-699 (250) mV vs 439 (273) mV; P < or = 0.05] and a significant delay in the recovery oxygenation from the 20TT. The mismatching of whole-body oxygen uptake and localised tissue oxygenation between the two tests could be due to differences in muscle temperature, pH, localised blood flow and motor unit recruitment patterns between the two tests.

Research paper thumbnail of Comparative Physiological Responses of Exercising Men and Women to 5 ppm Hydrogen Sulfide Exposure

American Industrial Hygiene Association journal, Nov 1, 1994

Research paper thumbnail of Reliability of peak cardiorespiratory responses in patients with moderate to severe traumatic brain injury11No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit upon the author(s) or upon any organization with w...

Archives of Physical Medicine and Rehabilitation, Nov 1, 2003

To examine the test-retest reliability of acute physiologic responses in patients with traumatic ... more To examine the test-retest reliability of acute physiologic responses in patients with traumatic brain injury (TBI). Repeated measures within 1 week. Brain injury rehabilitation program and community rehabilitation hospital. Thirty-six inpatients or their legal guardians. Each patient performed a symptom-limited incremental cycle ergometer test to voluntary fatigue on 2 separate occasions within 1 week. Peak values of power output and cardiorespiratory responses measured with a metabolic cart interfaced with an electrocardiogram. Intraclass correlations between the 2 trials were as follows: power output,.96; absolute oxygen uptake,.98; relative oxygen uptake,.97; heart rate,.82; ventilation rate,.96; and respiratory exchange ratio,.81. Bland-Altman plots showed that all data points were within the 95% confidence limits of the mean value of the 2 trials for each variable. The reliability of the peak cardiorespiratory responses during non-weight-bearing exercise was high in patients with TBI in a controlled laboratory setting. Therefore, aerobic exercise programs can be accurately prescribed, and changes resulting from such interventions can be confidently evaluated in this population.

Research paper thumbnail of Effects of circuit training on body composition and peak cardiorespiratory responses in patients with moderate to severe traumatic brain injury

Archives of Physical Medicine and Rehabilitation, Feb 1, 2005

Research paper thumbnail of Relationship Between Peak Aerobic Power and Cerebral Hemodynamics in Patients with Traumatic Brain Injury

Medicine and Science in Sports and Exercise, May 1, 2002

Research paper thumbnail of Assessment of Exercise Stroke Volume and Its Prediction From Oxygen Pulse in Paralympic Athletes With Locomotor Impairments: Cardiac Long-Term Adaptations Are Possible

Frontiers in Physiology, 2020

Research paper thumbnail of Reliability of erector spinae oxygenation and blood volume responses using near-infrared spectroscopy in healthy males

European Journal of Applied Physiology, May 1, 2004

Research paper thumbnail of Circuit Training Improves Submaximal Cardiorespiratory Fitness in Patients with Moderate to Severe Traumatic Brain Injury

Medicine and Science in Sports and Exercise, May 1, 2006

Research paper thumbnail of Optimal load setting for determining peak power output during arm ergometry in police officers

Medicine and Science in Sports and Exercise, 1991

Research paper thumbnail of Boosting Questionnaire--Modified

Research paper thumbnail of Evaluation of a new sports wheelchair design

Research paper thumbnail of Regional cerebral oxygenation and blood volume responses in healthy women during seated whole-body vibration (WBV)

Research paper thumbnail of Peak Oxygen Uptake And Muscle Oxygenation During Incremental Lifting In Healthy And Low-back Pain Subjects

Medicine and Science in Sports and Exercise, May 1, 2005

Research paper thumbnail of Intensity And Energy Expenditure Of Sports In Elite Paralympic Athletes With Locomotor Disabilities

Medicine and Science in Sports and Exercise, May 1, 2009

Symposium Lessons Learned on the Road to Vancouver (Olympic and Paralympic Friday 3:15PM-5:15PM A... more Symposium Lessons Learned on the Road to Vancouver (Olympic and Paralympic Friday 3:15PM-5:15PM Andrew Pipe,FACSM,University of Ottawa Sports Medicine Issues Committee) Heart Institute Randall L.Wilber,FACSM,United States Olympic Committee Jos de Koning,FACSM,University of Amsterdam Donald McKenzie,University of British Columbia Mark Aubry,Ottawa Sport Medicine Centre Marco Bernardi,University of Rom

Research paper thumbnail of Acute Effect of Two Different Whole Body Vibration Magnitudes on the Knee Extensors Strength

Medicine and Science in Sports and Exercise, May 1, 2008

Research paper thumbnail of Muscle Oxygenation at the Ventilatory Threshold During Incremental Arm and Leg Exercise 1517

Medicine and Science in Sports and Exercise, May 1, 1997

Research paper thumbnail of Reliability and reactivity of the prefrontal hemodynamic responses in essential hypertension: a functional near infrared spectroscopy study

Journal of The American Society of Hypertension, Oct 1, 2015

Research paper thumbnail of Validity of the Baltimore Therapeutic Equipment Work Simulator in Measuring Lifting Endurance

Medicine and Science in Sports and Exercise, May 1, 1999

To examine the criterion validity of the Baltimore Therapeutic Equipment (BTE) work simulator by ... more To examine the criterion validity of the Baltimore Therapeutic Equipment (BTE) work simulator by comparing endurance time, oxygen uptake (VO2), and heart rate measured during real and simulated lifting tasks and to derive a regression equation for predicting actual lifting endurance from measurements on the work simulator. Twenty healthy male volunteers repetitively lifted and lowered a load of 40 lb using the BTE work simulator and actual weights at a laboratory workstation. Postures, location, and frequency of lifts were kept constant. Endurance (defined as the time taken for the rating of perceived exertion to increase 2 units on the Borg scale) was measured under both conditions. VO2 and heart rate were also recorded, using standard physiological procedures. The mean values for endurance time, steady-state VO2, and heart rate were significantly different between the real and simulated tasks (p < .05). Correlation of endurance time between the two tasks was significant (r = .71, p < .05). Step wise regression analysis resulted in the following equation for predicting real endurance from simulated time measurements: predicted real time = .34 simulated time + 3.29; r = .71; SE = 1.00 min. The BTE work simulator tends to overestimate real lifting endurance performance in healthy men. The lower physiological stress during the simulated task suggests a significant difference between the real and simulated loads. Occupational therapists should exercise caution when using the results of the BTE work simulator during functional capacity evaluations.

Research paper thumbnail of Oxygen Pulse Predicts Stroke Volume During Wheelchair Racing in Trained Males with Quadriplegia 484

Medicine and Science in Sports and Exercise, May 1, 1997

Research paper thumbnail of Validity of Breathing Frequency to Monitor Exercise Intensity in Trained Cyclists

International Journal of Sports Medicine, May 1, 1995

This study compared breathing frequency (fB) during a ventilation threshold (VT) test with fB dur... more This study compared breathing frequency (fB) during a ventilation threshold (VT) test with fB during a simulated 40 km time trial (40TT) to assess whether fB can be used to monitor exercise intensity. Twenty-six male cyclists (mean +/- SD VO2max = 4.42 +/- 0274 l.min-1) performed an incremental VT ergometer test and a simulated 40TT on a set of wind-loaded rollers. During the 40TT, expired gas was collected for 3 min using open circuit spirometry at 10 km intervals. A significant correlation (r = 0.89; p < or = 0.05) was found between the fB threshold (VTf) and the gas exchange VT (VTg) (3.42 +/- 0.08 and 3.31 +/- 0.09 l.min-1, respectively). No differences were found in VO2 at the VTf vs. X VO2 (3.48 +/- 0.08 l.min-1) during the simulated 40TT. However, when fB in br.min-1 calculated from the VT test (32.5 br.min-1), was compared with fB during the 40TT (45.6 br.min-1), there was a significant difference. Ventilation, heart rate and the respiratory exchange ratio were all significantly higher during the 40TT. Although a significant relationship was found between the VT test and the 40TT for VTf measured in l.min-1 of VO2 (r = 0.66; p < or = 0.05), fB in br.min-1 obtained from the incremental test should not be used to identify exercise training intensity. These data suggest that during competition, trained athletes exercise at a higher fB than that determined when being tested, implying that fB in br.min-1 may not be a valid measurement of exercise intensity.

Research paper thumbnail of Vastus medialis muscle oxygenation trends during a simulated 20-km cycle time trial

European Journal of Applied Physiology, Sep 1, 2001

In this study we examined the oxygenation trend of the vastus medialis muscle during sustained hi... more In this study we examined the oxygenation trend of the vastus medialis muscle during sustained high-intensity exercise. Ten cyclists performed an incremental cycle ergometer test to voluntary exhaustion [mean (SD) maximum oxygen uptake 4.29 (0.63) l x min(-1); relative to body mass 60.8 (2.4) ml x kg(-1)min(-1)] and a simulated 20-km time trial (20TT) on a wind-loaded roller system using their own bicycle (group time = 23-31 min) in two separate sessions. Cardiorespiratory responses were monitored using an automated metabolic cart and a wireless heart rate monitor. Tissue absorbency, which was used as an index of muscle oxygenation, was recorded simultaneously from the vastus medialis using near-infrared spectroscopy. Group mean values for oxygen uptake, ventilation, heart rate, respiratory exchange ratio, power output, and rating of perceived exhaustion were significantly (P < or = 0.05) higher during the incremental test compared to the 20TT [4.29 (0.63) l x min(-1) vs 4.01 (0.55) l x min(-1), 120.4 (26) l x min(-1) vs 97.6 (16.1) l x min(-1), 195 (8) beats x min(-1) vs 177 (9) beats min(-1), 1.15 (0.06) vs 0.93 (0.06), 330.1 (31) W vs 307.2 (24.5) W, and 19 (1.5) vs 16 (1.7), respectively]. Oxygen uptake and heart rate during the 20TT corresponded to 93.5% and 90.7%, respectively, of the maximal values observed during the incremental test. Comparison of the muscle oxygenation trends between the two tests indicated a significantly greater degree of deoxygenation during the 20TT [-699 (250) mV vs 439 (273) mV; P < or = 0.05] and a significant delay in the recovery oxygenation from the 20TT. The mismatching of whole-body oxygen uptake and localised tissue oxygenation between the two tests could be due to differences in muscle temperature, pH, localised blood flow and motor unit recruitment patterns between the two tests.

Research paper thumbnail of Comparative Physiological Responses of Exercising Men and Women to 5 ppm Hydrogen Sulfide Exposure

American Industrial Hygiene Association journal, Nov 1, 1994

Research paper thumbnail of Reliability of peak cardiorespiratory responses in patients with moderate to severe traumatic brain injury11No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit upon the author(s) or upon any organization with w...

Archives of Physical Medicine and Rehabilitation, Nov 1, 2003

To examine the test-retest reliability of acute physiologic responses in patients with traumatic ... more To examine the test-retest reliability of acute physiologic responses in patients with traumatic brain injury (TBI). Repeated measures within 1 week. Brain injury rehabilitation program and community rehabilitation hospital. Thirty-six inpatients or their legal guardians. Each patient performed a symptom-limited incremental cycle ergometer test to voluntary fatigue on 2 separate occasions within 1 week. Peak values of power output and cardiorespiratory responses measured with a metabolic cart interfaced with an electrocardiogram. Intraclass correlations between the 2 trials were as follows: power output,.96; absolute oxygen uptake,.98; relative oxygen uptake,.97; heart rate,.82; ventilation rate,.96; and respiratory exchange ratio,.81. Bland-Altman plots showed that all data points were within the 95% confidence limits of the mean value of the 2 trials for each variable. The reliability of the peak cardiorespiratory responses during non-weight-bearing exercise was high in patients with TBI in a controlled laboratory setting. Therefore, aerobic exercise programs can be accurately prescribed, and changes resulting from such interventions can be confidently evaluated in this population.

Research paper thumbnail of Effects of circuit training on body composition and peak cardiorespiratory responses in patients with moderate to severe traumatic brain injury

Archives of Physical Medicine and Rehabilitation, Feb 1, 2005

Research paper thumbnail of Relationship Between Peak Aerobic Power and Cerebral Hemodynamics in Patients with Traumatic Brain Injury

Medicine and Science in Sports and Exercise, May 1, 2002

Research paper thumbnail of Assessment of Exercise Stroke Volume and Its Prediction From Oxygen Pulse in Paralympic Athletes With Locomotor Impairments: Cardiac Long-Term Adaptations Are Possible

Frontiers in Physiology, 2020

Research paper thumbnail of Reliability of erector spinae oxygenation and blood volume responses using near-infrared spectroscopy in healthy males

European Journal of Applied Physiology, May 1, 2004

Research paper thumbnail of Circuit Training Improves Submaximal Cardiorespiratory Fitness in Patients with Moderate to Severe Traumatic Brain Injury

Medicine and Science in Sports and Exercise, May 1, 2006

Research paper thumbnail of Optimal load setting for determining peak power output during arm ergometry in police officers

Medicine and Science in Sports and Exercise, 1991

Research paper thumbnail of Boosting Questionnaire--Modified

Research paper thumbnail of Evaluation of a new sports wheelchair design

Research paper thumbnail of Regional cerebral oxygenation and blood volume responses in healthy women during seated whole-body vibration (WBV)

Research paper thumbnail of Peak Oxygen Uptake And Muscle Oxygenation During Incremental Lifting In Healthy And Low-back Pain Subjects

Medicine and Science in Sports and Exercise, May 1, 2005

Research paper thumbnail of Intensity And Energy Expenditure Of Sports In Elite Paralympic Athletes With Locomotor Disabilities

Medicine and Science in Sports and Exercise, May 1, 2009

Symposium Lessons Learned on the Road to Vancouver (Olympic and Paralympic Friday 3:15PM-5:15PM A... more Symposium Lessons Learned on the Road to Vancouver (Olympic and Paralympic Friday 3:15PM-5:15PM Andrew Pipe,FACSM,University of Ottawa Sports Medicine Issues Committee) Heart Institute Randall L.Wilber,FACSM,United States Olympic Committee Jos de Koning,FACSM,University of Amsterdam Donald McKenzie,University of British Columbia Mark Aubry,Ottawa Sport Medicine Centre Marco Bernardi,University of Rom

Research paper thumbnail of Acute Effect of Two Different Whole Body Vibration Magnitudes on the Knee Extensors Strength

Medicine and Science in Sports and Exercise, May 1, 2008

Research paper thumbnail of Muscle Oxygenation at the Ventilatory Threshold During Incremental Arm and Leg Exercise 1517

Medicine and Science in Sports and Exercise, May 1, 1997

Research paper thumbnail of Reliability and reactivity of the prefrontal hemodynamic responses in essential hypertension: a functional near infrared spectroscopy study

Journal of The American Society of Hypertension, Oct 1, 2015

Research paper thumbnail of Validity of the Baltimore Therapeutic Equipment Work Simulator in Measuring Lifting Endurance

Medicine and Science in Sports and Exercise, May 1, 1999

To examine the criterion validity of the Baltimore Therapeutic Equipment (BTE) work simulator by ... more To examine the criterion validity of the Baltimore Therapeutic Equipment (BTE) work simulator by comparing endurance time, oxygen uptake (VO2), and heart rate measured during real and simulated lifting tasks and to derive a regression equation for predicting actual lifting endurance from measurements on the work simulator. Twenty healthy male volunteers repetitively lifted and lowered a load of 40 lb using the BTE work simulator and actual weights at a laboratory workstation. Postures, location, and frequency of lifts were kept constant. Endurance (defined as the time taken for the rating of perceived exertion to increase 2 units on the Borg scale) was measured under both conditions. VO2 and heart rate were also recorded, using standard physiological procedures. The mean values for endurance time, steady-state VO2, and heart rate were significantly different between the real and simulated tasks (p < .05). Correlation of endurance time between the two tasks was significant (r = .71, p < .05). Step wise regression analysis resulted in the following equation for predicting real endurance from simulated time measurements: predicted real time = .34 simulated time + 3.29; r = .71; SE = 1.00 min. The BTE work simulator tends to overestimate real lifting endurance performance in healthy men. The lower physiological stress during the simulated task suggests a significant difference between the real and simulated loads. Occupational therapists should exercise caution when using the results of the BTE work simulator during functional capacity evaluations.