The purpose was to examine selected physiological responses of endurance-trained male wheelchair athletes in different Paralympic racing classes (T2, n = 3; T3, n = 8; T4, n = 7) during a 10-km treadmill time trial (TM:10-km). Peak oxygen uptake (V̇O2 peak) was determined, and a TM:10-km was completed on a motorized treadmill. From this, % V̇O2peak utilized and the relationship between V̇O2peak and TM:10-km were established. During the TM:10-km, the following dependent variables were examined: propulsion speed, oxygen uptake, respiratory exchange ratio, and heart rate. The results showed athletes utilize a high % V̇O2peak (78.4 –13.6%) during the TM:10-km. There was a moderate correlation (r = -.57, p < .01) between VO2peak and TM:10-km. No physiological differences were found between the paraplegic racing classes (T3, T4), which suggests that there is some justification in amalgamating these racing classes for endurance events.
Ian G. Campbell, Clyde Williams and Henryk K.A. Lakomy
Ben J. Lee and Charles Douglas Thake
match the strain observed during “normal” nonsupported running. Therefore, the aim of this study was to compare the physiological response to running at 8 km·h −1 at different levels of BWS while breathing a hypoxic gas mixture compared with normoxia. It was hypothesized that cardiorespiratory strain
Kenji Masumoto, Ayako Hamada, Hiro-omi Tomonaga, Kana Kodama and Noboru Hotta
Walking in water has been included in rehabilitation programs. However, there is a dearth of information regarding the influence of a water current on physiological responses, rating of perceived exertion (RPE), and stride characteristics of subjects while they walk in water.
To compare physiological responses, RPE, and stride characteristics of subjects walking in water (with and without a current) with those of subjects walking on dry land.
7 male adults (mean age = 21.6 y).
Subjects walked on a treadmill on dry land and on an underwater treadmill immersed to the level of the xiphoid process. The walking speeds in water were set to be half of that on dry land.
Main Outcome Measures:
Oxygen consumption (VO2), respiratory-exchange ratio (RER), heart rate (HR), minute ventilation (VE), RPE (for breathing and legs, RPE-Br and RPE-Legs, respectively), systolic (SBP) and diastolic (DBP) blood pressures, and stride frequency (SF) were measured. In addition, stride length (SL) was calculated.
There was no significant difference in the VO2, RER, HR, VE, RPE-Br, and RPE-Legs while walking in water with a current compared with walking on dry land (P > .05). Furthermore, VO2, RER, HR, VE, RPE-Br, RPE-Legs, SF, and SBP while walking in water were significantly higher with a water current than without (P < .05).
These observations suggest that half the speed should be required to work at the similar metabolic costs and RPE while walking in water with a current, compared with walking on dry land. Furthermore, it was suggested that the physiological responses and RPE would be higher while walking in water with a current than without.
Stephen F. Figoni, Richard A. Boileau, Benjamin H. Massey and Joseph R. Larsen
The purpose of this study was to compare quadriplegic and able-bodied men on selected cardiovascular and metabolic responses to arm-crank ergometry at the same rate of oxygen consumption (V̇O2). Subjects included 11 untrained, spinal cord-injured, C5–C7 complete quadriplegic men and 11 untrained, able-bodied men of similar age (27 years), height (177 cm), and mass (65 kg). Measurement techniques included open-circuit spirometry, impedance cardiography, and electrocardiography. Compared with the able-bodied group, at the V̇O2 of 0.5 L/min, the quadriplegics displayed a significantly higher mean heart rate and arteriovenous O2 difference, lower stroke volume and cardiac output, and similar myocardial contractility. These results suggest that quadriplegic men achieve an exercise-induced V̇O2 of 0.5 L/min through different central cardiovascular adjustments than do able-bodied men. Quadriplegics deliver less O2 from the heart toward the tissues but extract more O2 from the blood. Tachycardia may contribute to low cardiac preload and low stroke volume, while paradoxically tending to compensate for low stroke volume by minimizing reduction of cardiac output.
George T. Hardison Jr., Richard G. Israel and Grant W. Somes
The purpose of this study was to identify the most desirable cranking rate to be used by paraplegic individuals during submaximal arm training programs. Eleven healthy paraplegic males (M age = 28.8 years) with lesion levels ranging from T4 to T12 served as subjects. Arm exercise loads for the four submaximal cranking rates studied (50, 60, 70, and 80 rpm) were set to elicit 60% of peak V̇O2. Duration of the submaximal tests was 15 min. V̇E, V̇O2, RER, HR, and differentiated RPE were recorded each minute throughout the 15-min test. A randomized block ANOVA and Duncan’s post hoc analysis indicated that 80 rpm produced significantly higher (p <.05) values for HR, absolute V̇O2, V̇E, V̇CO2, and V̇E/V̇O2 than any other rates. Cranking at 70 rpm resulted in significantly higher (p <.05) values for O2 pulse, while relative V̇O2 was significantly higher (p <05) at 70 rpm than at all other rates except 80 rpm. RPE was significantly higher (p <.05) at 50 rpm than at 60 or 70 rpm, with no difference between 50 and 80 or 60, 70, and 80. The authors concluded that 70 rpm was the most appropriate cranking rate for paraplegic males to use during arm training programs.
Yasuki Sekiguchi, Erica M. Filep, Courteney L. Benjamin, Douglas J. Casa and Lindsay J. DiStefano
hydration status of the subjects exercising in the heat 4 – 8 and it is well known that hydration status impacts physiological and performance responses in the heat. 9 Some of the physiological responses that are desired to elicit heat acclimation (ie, higher heart rate and internal body temperature) are
Aitor Iturricastillo, Javier Yanci and Cristina Granados
, which suggests that the physiological demands could be similar to those of a real game ( Yanci, Iturricastillo, & Granados, 2014 ). However, to our knowledge, there is no study with the aim of describing the neuromuscular load and physiological responses. Fatigue is a complex concept, involving both
Mário A.M. Simim, Gustavo R. da Mota, Moacir Marocolo, Bruno V.C. da Silva, Marco Túlio de Mello and Paul S. Bradley
the demands (i.e., distances covered and acute physiological responses) of AS match-play and its impact on muscular endurance and power. Methods Subjects Sixteen male Brazilian AS players (age: 32 ± 5 years; range: 25–42 years; body mass: 68.4 ± 9.9 kg; stature: 1.72 ± 0.07 m, and body fat: 14 ± 2
Ross Armstrong, Christopher Michael Brogden and Matt Greig
is the Dance Aerobic Fitness Test (DAFT), 14 which is a standardized routine that elicits a quantifiable physiological response to exercise to allow the measurement of mechanical loading. Global positioning systems (GPS) with triaxial accelerometry have been used to measure mechanical loading which
Brandon R. Rigby, Ronald W. Davis, Marco A. Avalos, Nicholas A. Levine, Kevin A. Becker and David L. Nichols
cognitive benefits to this population. Performing regular, moderate- to vigorous-intensity exercise in the middle of life has been associated with a decreased risk of developing PD later in life ( Xu et al., 2010 ). During exercise, physiological responses may be altered due to the inherent motor symptoms