Robert Kertzer's research while affiliated with University of New Hampshire and other places

Publications (26)

Article
The purpose of this investigation was to observe the effect of hypohydration (-4% body mass) on lactate threshold (LAT) in 14 collegiate athletes (8 men and 6 women; age, 20.9 +/- 0.5 years; height, 171.1 +/- 2.4 cm; weight, 64.8 +/- 2.3 kg; V(O)2 max, 62.8 +/- 1.9 ml x kg(-1) x min(-1); percentage of fat, 11.4 +/- 1.5%). Subjects performed 2 rando...
Article
Previous laboratory testing has identified the importance of upper-body aerobic and anaerobic power to cross-country skiing performance. The purpose of this investigation was to extend laboratory research into a field setting to identify predictors of performance through ski-specific testing. Thirteen male collegiate skiers performed three field-te...
Article
Full-text available
In order to determine an optimal starting technique, the first four-min of two 20 km time trials (TT) were manipulated. Thirteen competitive, male cyclists (22.7 +/- 0.8 yr, 180.6 +/- 2.2 cm; 77.1 +/- 2.8kg; 8.3+/-0.7% fat; 4.9+/-0.21 x min(-1), 71.7+/-1.4% of VO2max) performed three, 20 km TTs. The pace of the first TT was self-selected (SS). Min...
Article
Full-text available
MAHOOD, N. V., R. W. KENEFICK, R. KERTZER, and T. J. QUINN. Physiological determinants of cross-country ski racing performance. Med. Sci. Sports Exerc., Vol. 33, No. 8, 2001, pp. 1379 -1384. Purpose: Previous laboratory testing has identified the importance of upper-body aerobic and anaerobic power to cross-country skiing performance. The purpose o...
Article
Full-text available
Because blood lactic acid (LA) levels may be important in prescribing exercise for cardiac patients, this study documented the LA response to four different circuit weight training (CWT) protocols and compared these responses to both maximal treadmill and LA threshold values. Intervention study following a crossover trial design. A phase III commun...
Article
Full-text available
While most studies suggest circuit weight training (CWT) to be safe in cardiac rehabilitation populations, few investigators have controlled variables known to impact CWT intensity. Therefore, the purposes of this study were to determine the energy cost and evaluate safety of cardiac patients while varying rest interval duration and lifting load in...
Article
Full-text available
This study determined the effects of a 10-week strength training program on running economy in 12 female distance runners who were randomly assigned to either an endurance and strength training program (ES) or endurance training only (E). Training for both groups consisted of steady-state endurance running 4 to 5 days a week, 20 to 30 miles each we...
Article
Physiological responses were compared in nine stable male cardiac patients (mean +/- standard error (SE): age, 68.3 +/- 8.1 years; height, 172.7 +/- 3.9cm; weight, 72.8 +/- 14.5kg) during stationary cycling in the supine, recumbent, and upright positions. A discontinuous exercise protocol was performed in which each stage included 3 minutes of exer...
Article
Few studies have investigated the fitness levels of children and adolescents with insulin-dependent diabetes mellitus (IDDM), with no data presently available on such children's level of motor proficiency. The present investigation was prompted by this lack of information. Twenty-one girls (mean age = 11.0 years, range = 7-14) and 23 boys (mean age...
Article
Many research studies report the long-lasting elevation of metabolism following exercise. However, little is known regarding the impact of duration and intensity on this phenomenon, particularly in trained women in whom the time of the menstrual cycle has been controlled. This study examined the effects of a constant walking intensity (70% of maxim...
Article
Cardiorespiratory responses to three modes of air-braked ergometry were compared in nine stable patients with cardiac disease (x +/- standard deviation [SD]: age, 63.7 +/- 6.2 years of age; height, 172.2 +/- 4.0 cm; weight, 75.8 +/- 14.4 kg). Exercise modes included arm ergometry (AE), leg ergometry (LE), and combined arm and leg ergometry (ALE). A...
Article
The effect of endurance training on reflex venomotor control during an orthostatic challenge was investigated in 11 sedentary male volunteers. An exercise (E) group (n = 6) underwent 12 weeks of endurance exercise training, whereas a control (C) group (n = 5) remained sedentary. Training significantly increased VO2max values in E (pre-training: 37....
Article
Eleven sedentary male volunteers were assigned to either an exercise (E) group (n = 6; endurance exercise for 12 weeks) or a control (C) group (n = 5; no exercise). After training, E significantly increased (p less than 0.01) their VO2max (pretraining: 37.0 +/- 2.3; posttraining: 44.6 +/- 2.5), whereas C showed no significant change. Heart rate (HR...

Citations

... The duration of the interventions ranged from 8 to 12 weeks, with one study using high loads (85% 1RM) and the other four using moderate loads (40-70% 1RM). The addition of RE to the endurance training of well-trained endurance runners improved running economy (+4%) after 10 weeks without changes in body mass andVO 2 [53]. In addition, an 8-week intervention of heavy weight training on well-trained endurance runners improved running economy (+5%) and postponed the time to exhaustion, while no changes in body mass were reported [54]. ...
... Sport je v současnosti do značné míry ovlivněn komercionalizací a marketingem a především v NO se běžecké lyžování stalo lukrativním zbožím. Jak uvádí Kovář (2012) 86 % trenérů mužů považuje komercionalizaci za pozitivní faktor rozvoje sportu. zásadní význam má pro podporu a rozvoj elitních sportovců v NO organizace Olympiatoppen, která má za cíl následující: poskytování finančních grantů pro talentované sportovce ve všech olympijských sportech, poskytování lékařské podpory všem národním týmům, provozování národního sportovního střediska a umožnění další více či méně významné podpory pro sportovcův rozvoj, včetně péče a konzultací s nejrůznějšími odborníky (Augestad & Bergsgard, 2007). ...
... ml·kg −1 · min −1 ) (Conley and Krahenbuhl, 1980;Daniels and Daniels, 1992;Morgan et al., 1994;Saunders et al., 2004). Moreover, the mean value of VO 2 at 12 km·h −1 in level running of 37.7 ml·kg −1 · min −1 is in line with the values reported for moderately trained male runners (mean: 40.7, range: 37.4-48.1 mL·kg −1 · min −1 ) (Johnson et al., 1997;Spurrs et al., 2003;Støren et al., 2008;Berryman et al., 2010;Mikkola et al., 2011). ...
... On the other hand, a 10-week strength training, in addition to significantly increasing strength (24% for upper body lifting, 34% for lower body lifting), reduces RE by 4%, without modifying the VO 2 max (13). These data were confirmed in two meta-analyzes: even in highly trained runners, strength training in addition to improving maximum power and strength, reduces the energy cost of running (14,15). ...
... Lower limb osteoarthritis is a condition prevalent in older adults that can significantly impair lower limb exercise; only 60% of participants with lower limb osteoarthritis were able to use a cycle ergometer for exercise testing in a feasibility study [5]. Because of lower limb impediments, arm ergometry is often used as a substitute; however, peak _ VO 2 values are approximately 30% lower than those obtained during cycle ergometry in healthy individuals and those with coronary and peripheral artery disease [6][7][8][9]. Comparative arm ergometry data do not exist in the literature in patients with hip and knee osteoarthritis, although it is feasible that arm ergometry in this cohort could enable achievement of higher CPET values by utilising the unaffected upper limbs. Furthermore, the elliptical crosstrainer has been shown to evoke similar peak _ VO 2 values to treadmill testing in healthy individuals [10]. ...
... In this case, we recruited equal numbers of men and women to each training group to ensure an adequately powered statistical comparison of the response to IMT or sham training. A survey of the literature shows that comparable short-term (≤12 weeks) running and cycling training studies comprise an exclusively male subject pool (Clarkson et al., 1999;Jennings et al., 1986;Maeda et al., 2001;Meredith et al., 1991;Vroman, Healy, & Kertzer, 1988;Wijnen et al., 1994;Yamamoto, Miyachi, Saitoh, Yoshioka, & Onodera, 2001) or report outcomes after collapsing data across both sexes (Gormley et al., 2008;Meredith et al., 1990;Rakobowchuk et al., 2008;Table 5). In this regard, the present study is among the first to provide detailed information on the effects of an exercise training intervention on male and female subjects. ...
... Details on the exercise protocols used in the included studies are summarized in Table 3. All of the included studies used the continuous incremental exercise program, except for Quinn's study (12). The angle between the upper body and the horizontal in the supine position ranged from −6 to 65 • . ...
... Numerous studies have verified that accelerated metabolism (as reflected in excess post-oxygen consumption, EPOC) is important in connection with weight control (Gore and Withers, 1990;Brockman et al., 1993;Quinn et al., 1994;Laforgia et al., 1997;Hunter et al., 1998). In the present case, the overall energy expenditure during the 3 h of sitting and 6-min HIIT was approximately 347 ± 47 kcal, whereas the corresponding value for the 186 min of sitting was 238 ± 43 kcal. ...
... Reciprocal superset training may be a practical tool for satisfying exercise recommendations while reducing the total exercise session time. Training programs with lower rest times, such as RSSs, have been shown to elicit greater metabolic energy costs (11,19,26), increases in [BLa], and increases in excess postexercise oxygen consumption (EPOC) when compared with TRAD (26). These benefits, when coupled with a decrease in exercise duration, make RSSs a potentially favorable training modality for athletes with time-demanding training schedules. ...
... In 1998, DeGroot et al. 31,32 measured energy expenditure during different circuit weight training exercises in cardiac patients. The circuit consisted of repeat exercises at 40% or 60% of 1-RM on a bench press, lateral pull-down, shoulder press, hamstring curl, triceps extension, and quadriceps extension. ...