Allan Hahn - Academia.edu (original) (raw)

Papers by Allan Hahn

Research paper thumbnail of β-Hydroxy-β-Methylbutyrate (HMB) Supplementation Does Not Affect Changes in Strength or Body Composition during Resistance Training in Trained Men

International Journal of Sport Nutrition and Exercise Metabolism, Sep 1, 2001

Research paper thumbnail of Características Fisiológicas de Ciclistas Profesionales de Mountain Bike y de Ruta Exitosos - International Endurance Group

Research paper thumbnail of Power output demands of elite track sprint cycling

International Journal of Performance Analysis in Sport, Dec 1, 2005

Research paper thumbnail of Beneficios Potenciales de las Chaquetas Refrigerantes

PubliCE Standard, May 15, 2005

Los científicos del Instituto Australiano del Deporte han desarrollado una chaqueta para el pre e... more Los científicos del Instituto Australiano del Deporte han desarrollado una chaqueta para el pre enfriamiento de los atletas antes de eventos de resistencia en ambientes calurosos. Las chaquetas están hechas de un material que no permite el paso de la humedad y se rellenan con ...

Research paper thumbnail of Improved running economy and increased hemoglobin mass in elite runners after extended moderate altitude exposure

Journal of Science and Medicine in Sport, 2009

Research paper thumbnail of “Live high, train low” does not change the total haemoglobin mass of male endurance athletes sleeping at a simulated altitude of 3000 m for 23 nights

European journal of applied physiology and occupational physiology, Sep 1, 1999

Research paper thumbnail of Doug Tumilty, sports scientist, 1941–2004

Journal of Science and Medicine in Sport, Mar 1, 2005

Research paper thumbnail of Technological foundations and current status of a modified, low-risk form of competitive boxing (Box'Tag®)

Sports Technology, Aug 1, 2011

Boxing-related activities are commonly used for fitness enhancement, but for many people fear of ... more Boxing-related activities are commonly used for fitness enhancement, but for many people fear of injury precludes participation in competitive boxing. Over the past six years, technological developments have contributed to the emergence in Australia of a modified, low-risk form of competitive boxing called Box'Tag®. The rules of Box'Tag® prohibit impacts to the head and any impacts above a moderate level of force. Contestants wear instrumented equipment that, in combination with a dedicated software package, allows automated impact detection and real-time display of scores. Participatory action research methods are being used to guide iterative technology refinements, with success evaluated based on feedback obtained through constant, direct interaction with the technology end-users. In concert with technological advances, the popularity of Box'Tag® is steadily increasing, with programmes now established in three Australian states and about to be initiated elsewhere. Box'Tag® is attracting demographically diverse participation and injury rates are low. Physiological and perceptual data recorded during contests show Box'Tag® to be a highly intensive activity and an excellent vehicle for building physical fitness. There is scope for further technological improvements, but the Box'Tag® initiative is already demonstrating potential to add a new dimension to boxing and has been adopted by Australian boxing authorities.

Research paper thumbnail of Absence of refractoriness in asthmatic subjects after exercise with warm, humid inspirate

Research paper thumbnail of Townsend EJAP 2005

Research paper thumbnail of A simple method for the assessment of general fitness: The Tri-level Profile

The Australian journal of science, 1989

Research paper thumbnail of trained distance runners performance or erythropoietic markers in highly Intermittent normobaric hypoxia does not alter

Research paper thumbnail of Increased arterial desaturation in trained cyclists during maximal exercise at 580 m altitude

Journal of Applied Physiology, 1996

This study utilized a hypobaric chamber to compare the effects of mild hypobaria (MH; 50 mmHg, ap... more This study utilized a hypobaric chamber to compare the effects of mild hypobaria (MH; 50 mmHg, approximately 580 m altitude) on blood O2 status and maximal O2 consumption (VO2max) in 9 untrained and 11 trained (T) cyclists with VO2max values of 51 +/- 3 and 77 +/- 1 ml.kg-1.min-1, respectively. In both groups, arterial O2 saturation (SaO2) decreased significantly during maximal exercise, and this effect was enhanced with MH. Both these responses were significantly greater in the T cyclists in whom the final SaO2 during MH was 86.5 +/- 0.9%. When the group data were combined, approximately 65% of the variance in SaO2 could be attributed to a widened alveolar-arterial Po2 difference. The arterial PO2 during maximal exercise at sea level in the T group was on the steeper portion of the hemoglobin-O2-loading curve (T, 68.3 +/- 1.3 Torr; untrained, 89.0 +/- 2.9 Torr) such that a similar decrease in arterial PO2 in the two groups in response to MH resulted in a significantly greater fall ...

Research paper thumbnail of Footstrike is the major cause of hemolysis during running

Journal of Applied Physiology, 2002

There is a wide body of literature reporting red cell hemolysis as occurring after various forms ... more There is a wide body of literature reporting red cell hemolysis as occurring after various forms of exercise. Whereas the trauma associated with footstrike is thought to be the major cause of hemolysis after running, its significance compared with hemolysis that results from other circulatory stresses on the red blood cell has not been thoroughly addressed. To investigate the significance of footstrike, we measured the degree of hemolysis after 1 h of running. To control for the potential effects of oxidative and circulatory stresses on the red blood cell, the same subjects cycled for 1 h at equivalent oxygen uptake. Our subjects were 10 male triathletes, who each completed two separate 1-h sessions of running and cycling at 75% peak oxygen uptake, which were performed in random order 1 wk apart. Plasma free hemoglobin and serum haptoglobin concentrations were measured as indicators of hemolysis. We also measured methemoglobin as a percentage of total hemoglobin immediately postexer...

Research paper thumbnail of One hundred and fifty years of rowing faster

Research paper thumbnail of Histamine reactivity during the refractory period after exercise induced asthma

Research paper thumbnail of VO2max & ARTERIAL O2 SATURATION AT SEA LEVEL & 610 m

Medicine & Science in Sports & Exercise, 1995

Research paper thumbnail of Does Intermittent Normobaric Hypoxic Exposure Uncouple Submaximal &OV0312;O2 and Power?

Medicine & Science in Sports & Exercise, 1999

Research paper thumbnail of Accuracy of two pulse oximeters during maximal cycling exercise

Medicine &amp Science in Sports &amp Exercise, 1997

This study compared the measurement of oxygen saturation of haemoglobin (SaO2) by two pulse oxime... more This study compared the measurement of oxygen saturation of haemoglobin (SaO2) by two pulse oximeters (Ohmeda Biox 3700e and Criticare 504 USP) with the measurement of SaO2 in arterial blood samples by CO-oximetry. Unlike many previous validation studies, arterial blood was sampled in ground glass rather than plastic syringes. Twenty men, 11 well-trained cyclists (mean +/- SE, age = 23.3 +/- 1.5 years, mass = 71.4 +/- 1.1 kg VO2max = 77 +/- 1 ml.kg1.min-1) and 9 relatively untrained subjects (age = 27.1 +/- 2.8 years, mass = 78.1 +/- 2.2 kg VO2max = 51 +/- 3 ml.kg 1.min-1) performed two maximal cycle ergometer tests each in an hypobaric chamber. The tests were at 745 mm Hg or 695 mm Hg with simultaneous measurement of SaO2 by the pulse oximeters and the CO-oximeter at rest, minute 7 of exercise and at VO2max. The best correlations, to the Co-oximeter measurement (SCO-OXO2) were found when all data from rest and exercise were combined (Criticare: r = 0.94; Ohmeda: r = 0.91). The bias measurements showed the Ohmeda underestimated SCO-OXO2 at all levels (mean = -2.5 +/- 1.9%) and the Criticare overestimated SCO-OXO2 at all levels, although to a lesser degree (mean = 0.9 +/- 1.5%). In conclusion, these results highlight the need for validation of individual pulse oximeters and that the effect of dyshaemoglobins must also be considered.

Research paper thumbnail of Sport-Specific Reticulocyte Levels in Elite Athletes

Medicine & Science in Sports & Exercise, 1995

Research paper thumbnail of β-Hydroxy-β-Methylbutyrate (HMB) Supplementation Does Not Affect Changes in Strength or Body Composition during Resistance Training in Trained Men

International Journal of Sport Nutrition and Exercise Metabolism, Sep 1, 2001

Research paper thumbnail of Características Fisiológicas de Ciclistas Profesionales de Mountain Bike y de Ruta Exitosos - International Endurance Group

Research paper thumbnail of Power output demands of elite track sprint cycling

International Journal of Performance Analysis in Sport, Dec 1, 2005

Research paper thumbnail of Beneficios Potenciales de las Chaquetas Refrigerantes

PubliCE Standard, May 15, 2005

Los científicos del Instituto Australiano del Deporte han desarrollado una chaqueta para el pre e... more Los científicos del Instituto Australiano del Deporte han desarrollado una chaqueta para el pre enfriamiento de los atletas antes de eventos de resistencia en ambientes calurosos. Las chaquetas están hechas de un material que no permite el paso de la humedad y se rellenan con ...

Research paper thumbnail of Improved running economy and increased hemoglobin mass in elite runners after extended moderate altitude exposure

Journal of Science and Medicine in Sport, 2009

Research paper thumbnail of “Live high, train low” does not change the total haemoglobin mass of male endurance athletes sleeping at a simulated altitude of 3000 m for 23 nights

European journal of applied physiology and occupational physiology, Sep 1, 1999

Research paper thumbnail of Doug Tumilty, sports scientist, 1941–2004

Journal of Science and Medicine in Sport, Mar 1, 2005

Research paper thumbnail of Technological foundations and current status of a modified, low-risk form of competitive boxing (Box'Tag®)

Sports Technology, Aug 1, 2011

Boxing-related activities are commonly used for fitness enhancement, but for many people fear of ... more Boxing-related activities are commonly used for fitness enhancement, but for many people fear of injury precludes participation in competitive boxing. Over the past six years, technological developments have contributed to the emergence in Australia of a modified, low-risk form of competitive boxing called Box'Tag®. The rules of Box'Tag® prohibit impacts to the head and any impacts above a moderate level of force. Contestants wear instrumented equipment that, in combination with a dedicated software package, allows automated impact detection and real-time display of scores. Participatory action research methods are being used to guide iterative technology refinements, with success evaluated based on feedback obtained through constant, direct interaction with the technology end-users. In concert with technological advances, the popularity of Box'Tag® is steadily increasing, with programmes now established in three Australian states and about to be initiated elsewhere. Box'Tag® is attracting demographically diverse participation and injury rates are low. Physiological and perceptual data recorded during contests show Box'Tag® to be a highly intensive activity and an excellent vehicle for building physical fitness. There is scope for further technological improvements, but the Box'Tag® initiative is already demonstrating potential to add a new dimension to boxing and has been adopted by Australian boxing authorities.

Research paper thumbnail of Absence of refractoriness in asthmatic subjects after exercise with warm, humid inspirate

Research paper thumbnail of Townsend EJAP 2005

Research paper thumbnail of A simple method for the assessment of general fitness: The Tri-level Profile

The Australian journal of science, 1989

Research paper thumbnail of trained distance runners performance or erythropoietic markers in highly Intermittent normobaric hypoxia does not alter

Research paper thumbnail of Increased arterial desaturation in trained cyclists during maximal exercise at 580 m altitude

Journal of Applied Physiology, 1996

This study utilized a hypobaric chamber to compare the effects of mild hypobaria (MH; 50 mmHg, ap... more This study utilized a hypobaric chamber to compare the effects of mild hypobaria (MH; 50 mmHg, approximately 580 m altitude) on blood O2 status and maximal O2 consumption (VO2max) in 9 untrained and 11 trained (T) cyclists with VO2max values of 51 +/- 3 and 77 +/- 1 ml.kg-1.min-1, respectively. In both groups, arterial O2 saturation (SaO2) decreased significantly during maximal exercise, and this effect was enhanced with MH. Both these responses were significantly greater in the T cyclists in whom the final SaO2 during MH was 86.5 +/- 0.9%. When the group data were combined, approximately 65% of the variance in SaO2 could be attributed to a widened alveolar-arterial Po2 difference. The arterial PO2 during maximal exercise at sea level in the T group was on the steeper portion of the hemoglobin-O2-loading curve (T, 68.3 +/- 1.3 Torr; untrained, 89.0 +/- 2.9 Torr) such that a similar decrease in arterial PO2 in the two groups in response to MH resulted in a significantly greater fall ...

Research paper thumbnail of Footstrike is the major cause of hemolysis during running

Journal of Applied Physiology, 2002

There is a wide body of literature reporting red cell hemolysis as occurring after various forms ... more There is a wide body of literature reporting red cell hemolysis as occurring after various forms of exercise. Whereas the trauma associated with footstrike is thought to be the major cause of hemolysis after running, its significance compared with hemolysis that results from other circulatory stresses on the red blood cell has not been thoroughly addressed. To investigate the significance of footstrike, we measured the degree of hemolysis after 1 h of running. To control for the potential effects of oxidative and circulatory stresses on the red blood cell, the same subjects cycled for 1 h at equivalent oxygen uptake. Our subjects were 10 male triathletes, who each completed two separate 1-h sessions of running and cycling at 75% peak oxygen uptake, which were performed in random order 1 wk apart. Plasma free hemoglobin and serum haptoglobin concentrations were measured as indicators of hemolysis. We also measured methemoglobin as a percentage of total hemoglobin immediately postexer...

Research paper thumbnail of One hundred and fifty years of rowing faster

Research paper thumbnail of Histamine reactivity during the refractory period after exercise induced asthma

Research paper thumbnail of VO2max & ARTERIAL O2 SATURATION AT SEA LEVEL & 610 m

Medicine & Science in Sports & Exercise, 1995

Research paper thumbnail of Does Intermittent Normobaric Hypoxic Exposure Uncouple Submaximal &OV0312;O2 and Power?

Medicine & Science in Sports & Exercise, 1999

Research paper thumbnail of Accuracy of two pulse oximeters during maximal cycling exercise

Medicine &amp Science in Sports &amp Exercise, 1997

This study compared the measurement of oxygen saturation of haemoglobin (SaO2) by two pulse oxime... more This study compared the measurement of oxygen saturation of haemoglobin (SaO2) by two pulse oximeters (Ohmeda Biox 3700e and Criticare 504 USP) with the measurement of SaO2 in arterial blood samples by CO-oximetry. Unlike many previous validation studies, arterial blood was sampled in ground glass rather than plastic syringes. Twenty men, 11 well-trained cyclists (mean +/- SE, age = 23.3 +/- 1.5 years, mass = 71.4 +/- 1.1 kg VO2max = 77 +/- 1 ml.kg1.min-1) and 9 relatively untrained subjects (age = 27.1 +/- 2.8 years, mass = 78.1 +/- 2.2 kg VO2max = 51 +/- 3 ml.kg 1.min-1) performed two maximal cycle ergometer tests each in an hypobaric chamber. The tests were at 745 mm Hg or 695 mm Hg with simultaneous measurement of SaO2 by the pulse oximeters and the CO-oximeter at rest, minute 7 of exercise and at VO2max. The best correlations, to the Co-oximeter measurement (SCO-OXO2) were found when all data from rest and exercise were combined (Criticare: r = 0.94; Ohmeda: r = 0.91). The bias measurements showed the Ohmeda underestimated SCO-OXO2 at all levels (mean = -2.5 +/- 1.9%) and the Criticare overestimated SCO-OXO2 at all levels, although to a lesser degree (mean = 0.9 +/- 1.5%). In conclusion, these results highlight the need for validation of individual pulse oximeters and that the effect of dyshaemoglobins must also be considered.

Research paper thumbnail of Sport-Specific Reticulocyte Levels in Elite Athletes

Medicine & Science in Sports & Exercise, 1995

Research paper thumbnail of Overview and summary of ModBox in India

An Australian sport-based development initiative is currently operating in 10 schools across the ... more An Australian sport-based development initiative is currently operating in 10 schools across the northern Indian states of Uttarakhand and Uttar Pradesh. The project uses a modified, low-risk form of boxing (ModBox) as a vehicle for reaching young people from some of the most disadvantaged sectors of the Indian community and is aimed at facilitating their personal development.