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Full-Text Articles in Life Sciences
Determination Of Force Corresponding To Maximal Lactate Steady State In Tethered Swimming, Marcelo Papoti‡, Ricardo Vitório†, Sérgio A. Cunha†, Gustavo G. Araújo†, Adelino S.R. Silva‡, Vanessa Santhiago‡, Luiz E.B. Martins‡, Claudio A. Gobatto‡
Determination Of Force Corresponding To Maximal Lactate Steady State In Tethered Swimming, Marcelo Papoti‡, Ricardo Vitório†, Sérgio A. Cunha†, Gustavo G. Araújo†, Adelino S.R. Silva‡, Vanessa Santhiago‡, Luiz E.B. Martins‡, Claudio A. Gobatto‡
International Journal of Exercise Science
The main aim of the present investigation was to verify if the aerobic capacity (AC) measured in tethered swimming corresponds to the maximal lactate steady state (MLSS) and its correlation with 30 min and 400m free style swimming. Twenty-five swimmers were submitted to an incremental tethered swimming test (ITS) with an initial load of 20N and increments of 10N each 3min. After each stage of 3min, the athletes had 30s of interval to blood sample collections that were used to measure blood lactate concentrations ([La-]). The ACBI was determined by the abrupt increase in [La-] versus force (F). The points …
Evaluation Of Hand-To-Hand Bioelectrical Impedance Analysis For Estimating Percent Body Fat In Young Adults, Aaron M. Weaver*, Ashley C. Hill*, Joseph L. Andreacci‡, Curt B. Dixon‡
Evaluation Of Hand-To-Hand Bioelectrical Impedance Analysis For Estimating Percent Body Fat In Young Adults, Aaron M. Weaver*, Ashley C. Hill*, Joseph L. Andreacci‡, Curt B. Dixon‡
International Journal of Exercise Science
Purposes were to (a) to examine the validity and precision of a hand-to-hand bioelectrical impedance analyzer (HBIA) and (b) to determine the effect of an acute sub-maximal aerobic exercise bout on HBIA percent body fat (%BF) measures. Forty-one young adults (21 women; 20 men) visited the laboratory for body composition assessment on two separate occasions. During the control session, %BF was assessed by HBIA twice, before and immediately after 30 min of rest, and once by air-displacement plethysmography (ADP), using the BOD POD, which was considered the criterion method for comparison. During the exercise session, HBIA %BF measurements were determined …
Comparison Of The Power Plate And Free Weight Exercises On Upper Body Muscle Endurance In Young Athletes, Elisabeth Boland*, Dan Boland*, Thomas Carroll‡, William R. Barfield‡
Comparison Of The Power Plate And Free Weight Exercises On Upper Body Muscle Endurance In Young Athletes, Elisabeth Boland*, Dan Boland*, Thomas Carroll‡, William R. Barfield‡
International Journal of Exercise Science
The power plate (PP) is designed to reduce training time while providing a muscle stimulus that leads to positive changes in muscle mass. This study investigated the effect that training on the PP has compared to a free-weight (FW) program, on upper body endurance, defined as the number of push-ups completed at one time prior to failure. Following IRB approval a pre-test was used to assess push-up endurance in PP and FW cohorts. Each group exercised for six consecutive weeks, working out three times per week, on non-consecutive days performing five exercises of two sets of 8-12 repetitions. Twenty-two females …
Power Training: Can It Improve Functional Performance In Older Adults? A Systematic Review, John Rice†, Justin Keogh‡
Power Training: Can It Improve Functional Performance In Older Adults? A Systematic Review, John Rice†, Justin Keogh‡
International Journal of Exercise Science
Older adults’ reduced performance in functional activities of daily living (ADL) such as gait, sit to stand or stair climbing may reflect age-related declines in muscular power more so than strength. Therefore, this review was conducted to determine if power training is effective in improving the functional ability of older adults, and if so, if it was more effective than strength training. The review was performed using Medline (PubMed), CINAHL, Sports Discus, ProQuest 5000 International and Google Scholar with the keywords “power training”, “older adult” and “elder” and all derivatives. Of the 12 eligible studies identified, nine also included a …
Anthropometric And Physiological Predictors Of Flat-Water 1000 M Kayak Performance In Young Adolescents And The Effectiveness Of A High Volume Training Camp., Scott C. Forbes†, Daniel L. Fuller†, Joel R. Krentz†, Jonathon P. Little†, Phillip D. Chilibeck‡
Anthropometric And Physiological Predictors Of Flat-Water 1000 M Kayak Performance In Young Adolescents And The Effectiveness Of A High Volume Training Camp., Scott C. Forbes†, Daniel L. Fuller†, Joel R. Krentz†, Jonathon P. Little†, Phillip D. Chilibeck‡
International Journal of Exercise Science
Our purpose was to determine the relationship of anthropometric and physiological variables with 1000m flat-water kayak (K1000) performance. A secondary purpose was to determine the effectiveness of a high volume training camp. High performance young adolescent kayakers (n=13, 8 males, 5 females, 15±1 yrs) participated in this study. Testing before and after the 3-4 week training camp included anthropometric measurements (height, sitting height, arm span, and body mass), strength (1-RM: bench press and bench pull), flexibility (sit and reach), and an incremental kayak ergometer test to determine peak oxygen uptake (VO2peak) and anaerobic threshold, and an open water K1000 time …
Determination Of Blood Lactate Concentration: Reliability And Validity Of A Lactate Oxidase-Based Method, Rachel White*, Daniel Yaeger*, Stasinos Stavrianeas‡
Determination Of Blood Lactate Concentration: Reliability And Validity Of A Lactate Oxidase-Based Method, Rachel White*, Daniel Yaeger*, Stasinos Stavrianeas‡
International Journal of Exercise Science
The measurement of blood lactate has long been used as marker of exercise intensity and training status. We compared a commercially available lactate oxidase spectrophotometric method (LO) to determine blood lactate levels to two previously validated methods, the lactate dehydrogenase spectrophotometric method (LDH), and the YSI 1500L Sport lactate analyzer (YSI). First we established a series of calibration curves over physiological range of lactate values (1-15 mM∙l-1 for the spectrophotometric assays and 1-30 mM∙l-1 for the YSI) with high correlations (0.986 < r < 0.999). Aerobically trained participants (n = 11) performed repeated exercise bouts of varying intensities on a cycle ergometer. Capillary blood samples (n = 189) were collected from the earlobe and the blood lactate concentration was determined using each of the three methods. An ANOVA (alpha=0.05) revealed no differences in blood lactate concentrations between the three methods. The three experimental protocols yielded similarly-shaped lactate curves, although the actual values for the LDH method was somewhat lower than the LO and the YSI at every intensity level. Bland-Altman plots revealed a slight bias towards lower lactate values with the LDH method, perhaps indicative of a more conservative measure of blood lactate. We conclude that the LO method is a reliable and valid method to determine blood lactate concentrations spectrophotometrically. All three methods can provide useful within-subject lactate curves, although we caution against interchangeable use of the three methods.
Validation Of The Actiheart Monitor For The Measurement Of Physical Activity, Tiago V. Barreira†, Minsoo Kang‡, Jennifer L. Caputo‡, Richard S. Farley‡, Matthew S. Renfrow†
Validation Of The Actiheart Monitor For The Measurement Of Physical Activity, Tiago V. Barreira†, Minsoo Kang‡, Jennifer L. Caputo‡, Richard S. Farley‡, Matthew S. Renfrow†
International Journal of Exercise Science
The Actiheart monitor uniquely allows simultaneous measurement of heart rate and movement counts. The purpose of this study was to establish validity evidence for the Actiheart monitor under laboratory and free-living conditions. A total of 34 college students (17 males and 17 females, age = 21.8 ± 3.6 years) participated in the study. In the laboratory environment, the participants completed three, 5 min bouts of treadmill walking and/or running at speeds of 3.2, 6.4, and 9.6 km/h. Outside the laboratory, participants were asked to perform free-living physical activity for 30 min. For validation, energy expenditure, movement counts, and heart rate …
Modeling Oxygen Uptake During V1 Treadmill Roller Skiing, Robert S. Bowen†, Randall L. Jensen‡, Jennifer M. Ryan†, Phillip B. Watts‡
Modeling Oxygen Uptake During V1 Treadmill Roller Skiing, Robert S. Bowen†, Randall L. Jensen‡, Jennifer M. Ryan†, Phillip B. Watts‡
International Journal of Exercise Science
The use of regression equations to predict oxygen uptake in relation to speed, grade, power output, and anthropometric characteristics is common in cardiac rehabilitation and athlete fitness testing. Research has suggested that sport specific testing improves the reliability of the test methodology and is appropriate for the development of effective training programs. This study focused on the development of a cross-country skiing specific predictor of maximal oxygen uptake based on treadmill speed, treadmill grade, gender, and body mass. This project simulated snow skiing on a large research treadmill using roller skis. A small sample size (N = 34) warranted the …
Comparison Of Body Composition Measurements Using A New Caliper, Two Established Calipers, Hydrostatic Weighing, And Bodpod, Erin E. Talbert*, Michael G. Flynn‡, Jeffrey W. Bell†, Andres E. Carrillo†, Marquita D. Dill†, Christiania N. Christensen*, Colleen M. Thompson†
Comparison Of Body Composition Measurements Using A New Caliper, Two Established Calipers, Hydrostatic Weighing, And Bodpod, Erin E. Talbert*, Michael G. Flynn‡, Jeffrey W. Bell†, Andres E. Carrillo†, Marquita D. Dill†, Christiania N. Christensen*, Colleen M. Thompson†
International Journal of Exercise Science
Purposes: (1) To compare the Lafayette Instruments (LI) skinfold caliper to the Lange (L) and Harpenden (H) calipers using a diverse subject population. (2) To determine the validity of the LI caliper in a subset of subjects by comparing body compositions from skinfold thicknesses to those measured by hydrostatic weighing (HW) and air displacement plethysmography (ADP). (3) To compare measurements obtained by experienced (EX) and inexperienced (IX) technicians using all three calipers. Methods: Skinfold measurements were performed by both EX and IX technicians using three different calipers on 21 younger (21.2 ± 1.5 yrs) and 20 older (59.2 ± 4 …