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The effect of a near-maximal effort one-hour run on preferred and optimal stride rate and vertical stiffnessHunter, Iain 12 July 2001 (has links)
Experienced runners naturally optimize stride rate in a manner that
minimizes oxygen uptake at given running speeds. However, as runners become
fatigued, preferred stride rate often decreases. Whether such changes with fatigue
occur in parallel with changes in optimal stride rate is unknown. This study's focus
was on determining whether experienced runners self-optimize stride rate
throughout a near-maximal one-hour run. A secondary focus was to determine if
vertical stiffness is associated with decreases in stride rate.
Seventeen subjects completed a one-hour near-maximal effort run on a
treadmill. After the first five minutes, preferred and optimal stride rates were
measured. Ground reaction force data were used to determine preferred stride rate
averaged over ten strides. Runners completed five two-minute segments of
running at preferred stride rate, 4% and 8% above and below their preferred rate.
Oxygen uptake was measured during the second minute of each two-minute
segment. Fitting a second-degree polynomial through oxygen uptake versus stride
rate data provided a minimum value for oxygen uptake from which optimal stride
rate was determined. Fifty minutes into the run, optimal stride rate was measured
again.
Repeated measures ANOVA showed no difference between preferred and
optimal stride rates at the beginning or at the end of the run, but a decrease in
optimal stride rate was observed from beginning to end. About half of the subjects
decreased preferred and optimal stride rate over the course of the hour run while
the other half showed little or no change.
Vertical stiffness was measured based upon center of mass vertical
displacement and active peak force. Decreases in preferred stride rate over the
course of the hour run were expected to be associated with decreases of vertical
stiffness. However, the changes in stride rate and vertical stiffness were small; no
strong relationship was observed (R²=0.12).
Experienced runners have demonstrated the capability to self-optimize
stride rate at the beginning and near the end of a one hour run. This ability was
observed for runners with substantial shifts of stride rate with fatigue as well as for
runners with no change of stride rate with fatigue. / Graduation date: 2002
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PHYSIOLOGICAL DETERMINANTS OF SUCCESS IN DISTANCE RUNNING: SPECIAL EMPHASIS ON THE ONSET OF PLASMA LACTATE ACCUMULATIONFarrell, Peter Anthony January 1978 (has links)
No description available.
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Effect of intense interval workouts on running economy using three recovery durationsZavorsky, Gerald Stanley. January 1997 (has links)
The purposes of this study were to determine if (1) RE is adversely affected by intense interval bouts of 10 x 400-m, and (2) if there is an interaction effect between RE and recovery duration during the workouts. Twelve highly trained male runners (VO$ rm sb{2max} = 72.5 pm 4.3 ml cdot kg sp{-1} cdot min sp{-1}$) performed 3 interval workouts of 10 x 400-m with a minimum of 4 days between runs. Recovery between repetitions was randomly assigned at 60, 120 or 180 s. The velocity for each 400-m run was determined from a treadmill VO$ rm sb{2max}$ test. The average running velocity was 357.9 $ pm$ 9.0 $ rm m cdot min sp{-1}$. Following the workout, rating of perceived exertion (RPE) increased significantly (p $<$ 0.01) as recovery duration decreased (14.4 at 180 s; 16.1 at 120 s; 17.7 at 60 s recovery). Prior to and following each workout, RE was measured at speeds of 200 and 268 $ rm m cdot min sp{-1}$. Changes from pre to post RE tests in VO$ sb2$, HR, and RER were similar for the three recovery conditions. Averaged across conditions, VO$ sb2$ increased significantiy (p $<$ 0.01) pre to post tests (38.5 to 40.5 $ rm ml cdot kg sp{-1}min sp{-1}$ at 200 $ rm m cdot min sp{-1}$ and from 53.1 to 54.5 $ rm ml cdot kg sp{-1}min sp{-1}$ at 268 $ rm m cdot min sp{-1}$) HR increased (124 to 138; and 151 to 157 bpm) and RER decreased (0.90 to 0.78; and 0.93 to 0.89) at 200 and 268 $ rm m cdot min sp{-1}$, respectively (p $<$ 0.01). This study showed that RE can be perturbed after a high-intensity interval workout and that changes in VO$ sb2$, HR and RER were independent of the recovery duration between repetitions.
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The effect of banked-curves on electromyographic activity in the lower leg during running : by Jennifer Gow.Gow, Jennifer. January 2005 (has links)
The biomechanics of running on level surfaces has been extensively researched, but there is limited knowledge on the biomechanical adaptations of curvilinear running. The purpose of this study was to investigate the electromyographic activity (EMG) of the lower leg muscles while running at two speeds (3.8 and 7.0 m/s) under three conditions (straight-away, flat curve, and banked curve of 11 degrees). Seven male elite track runners participated. Surface electrodes were placed bilaterally on the tibialis anterior (TA), peroneus longus (PL), and gastrocnemius lateralis (GL) muscles. In general, there was greater EMG activity and body lean at the higher speeds for each muscle (p< 0.05); however minimal differences in EMG between the three surface running conditions (except for the second peak of TA). No bi-lateral asymmetry in muscle activation occurred during curved running, whether flat or banked. Future study should address more proximal segment and trunk muscular adaptations.
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The effect of banked-curves on running mechanics : plantar foot pressuresMurias, Juan Manuel. January 2006 (has links)
The purpose of this study was to investigate the dynamic patterns of pressure distribution of curved running with and without banked surfaces at two speeds. Seven male elite runners ran at 3.8 m/s and 7.0 m/s in three different conditions: (1) straight, and along a curve with either (2) no side inclination or (3) an inclination of 19%. Running speed significantly affected peak pressure for plantar foot regions (p<0.05); however, few significant main effects were found for surface running condition or foot side. Center of pressure displacement showed similar patterns in both the medial-lateral and heel to toe excursion regardless the running condition, speed, or foot side. Future study needs to reduce measurement variability as well as to consider other dynamic foot-to-shoe components such as shear stresses.
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The effect of banked-curves on electromyographic activity in the lower leg during running : by Jennifer Gow.Gow, Jennifer. January 2005 (has links)
No description available.
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The effect of banked-curves on running mechanics : plantar foot pressuresMurias, Juan Manuel. January 2006 (has links)
No description available.
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Effect of intense interval workouts on running economy using three recovery durationsZavorsky, Gerald Stanley. January 1997 (has links)
No description available.
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Leg spring model related to muscle activation, force, and kinematic patterns during endurance running to voluntary exhaustionDutto, Darren John 16 September 1999 (has links)
Graduation date: 2000
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The effect of sodium citrate ingestion on 1600 meter running performanceGuerra, Arthur 02 May 1995 (has links)
Graduation date: 1995
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