Timothy J. Quinn

University of New Hampshire | UNH · Department of Kinesiology

The purpose was to test whether lower-extremity vertical stiffness and gait mechanics explain differences in energy cost of walking (Cw) between individuals with normal weight (NW) and obesity (OB). Ten OB (33.1 ± 2.0 kg m⁻²) and 10 NW (24.2 ± 1.3 kg m⁻²) walked for six minutes on an instrumented treadmill at 1.25 m s⁻¹ while Cw, lower-extremity ki...

Quinn, TJ, Dempsey, SL, LaRoche, DP, Mackenzie, AM, and Cook, SB. Step frequency training improves running economy in well-trained female runners. J Strength Cond Res XX(X): 000-000, 2019-The purpose was to determine whether a short training program (15 minutes for 10 days) to increase step frequency to 180 steps per min would elicit improvements i...

The purposes of this study were to evaluate whether there were changes in markers of cardiovascular and muscle damage and then to determine whether running economy (RE) was adversely affected due to those changes in a group of runners training for a marathon following a 26-km moderately paced outdoor long training run (LTR). Fifteen, healthy male p...

The purpose of this study was to investigate the relationship that age has on factors affecting running economy (RE) in competitive distance runners. Fifty-one male and female subelite distance runners (Young [Y]: 18-39 years [n = 18]; Master [M]: 40-59 years [n = 22]; and Older [O]: 60-older [n = 11]) were measured for RE, step rate, lactate thres...

In this study, we wished to determine the relationship between the Talk Test physiological and perceptual indicators and variables measured at the ventilatory and lactate thresholds, and if the Talk Test indicators were associated with a typical exercise prescription. Fifteen participants (13 males and 2 females; age 18-35 years) underwent a treadm...

The purpose of this study was to develop a modified version of a 3-min all-out cycling test (3MT) using equipment readily available to cyclists and to identify exercise intensity domains using the average power output over the last 30 s of the 3MT (end-test power (EP)). Sixteen competitive cyclists (V(O2peak) = 60.3 +/- 8.3 mL.kg.min) completed thr...

Purpose: The purpose of this study was to develop a modified version of a 3-min all-out cycling test (3MT) using equipment readily available to cyclists and to identify exercise intensity domains using the average power output over the last 30 s of the 3MT (end-test power (EP)). Methods: Sixteen competitive cyclists (V ˙ O 2peak = 60.3 T 8.3 mLIkg...

To date, studies involving creatine supplementation (CrS) and repetitive sprint performance have included either complete rest or passive recovery between sprinting efforts. In competitive cycling, criteriums are popular events, which require intermittent all out sprinting followed by "recovery cycling" normally maintained at approximately lactate...

The purpose of this study was to determine the optimal 1.63-km (1-mile) pacing strategy for 5-km running performance in moderately trained women distance runners. Eleven women distance runners (20.7 +/- 0.8 years, 163.8 +/- 2.0 cm, 57.0 +/- 2.2 kg, 51.7 +/- 1.0 ml.kg(-1).min(-1), 18.9 +/- 0.8% fat, 78.1 +/- 1.4% VO(2)max at lactate threshold) perfo...

This study sought to determine whether a 12-week intermittent (INT; 2 x 15 min.d(-1)) exercise program yielded similar improvements in cardiovascular health and fitness, compared with a traditional 12-week, 30-minute continuous (CON; 1 x 30 min.d(-1)) exercise program. A second purpose was to determine the effects of switching exercise programs and...

This study sought to determine whether a 12-week intermittent (INT; 2 3 15 min[middle dot]d-1) exercise program yielded similar improvements in cardiovascular health and fitness, compared with a traditional 12-week, 30-minute continuous (CON; 1 X 30 min[middle dot]d-1) exercise program. A second purpose was to determine the effects of switching exe...

Hyperosmotic hypovolemia impairs vasoconstriction during sedentary cold exposure. The purpose of this study was to determine whether hypohydration alters thermoregulation and cardiovascular responses to exercise in cold air. On four occasions, eight males [35.1 (2.7) years, 175.5 (3.1) cm, 73.3 (2.6) kg, 57.2 (2.6) ml kg−1 min−1 maximal oxygen upta...

The importance of lactate threshold (LT) as a determinant of performance in endurance sports has been established. In addition, it has been shown that during running and selected other endurance competitions, athletes perform at a velocity and VO2 slightly above LT for the duration of the event. Prior work indicates however, that this may not be tr...

Previous research reported that breast milk lactic acid (LA) levels increase after lactating women complete a bout of exhaustive exercise, resulting in poor infant acceptance of the postexercise breast milk. This highly publicized finding may not apply to more practical, everyday exercise conditions of lactating women. The purpose of the present st...

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...

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...

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...

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...

Lactation is an energy-demanding physiological process for the maternal organism and life-giving for the offspring. Likewise, exercise is an energy-demanding process. This review addresses the compatibility of exercise during lactation. Human studies suggest no detrimental effect of exercise during lactation on milk composition and volume, infant g...

Mild to moderate acute, endurance exercise has generally been shown to reduce blood pressure (BP) in hypertensive (HT) individuals. Whether a slightly more strenuous bout of exercise can elicit a greater and more prolonged BP reduction is unknown. Therefore, the purpose of this study was to examine the effects of two, 30-min exercise bouts, conduct...

This study examined the relationships among diet, exercise intensity, and breast milk composition in lactating women. Twelve lactating women were randomly assigned to either a high (N = 6; 5.03 g carbohydrate (CHO) x kg body mass (BM)(-1)) or moderate (N = 6; 3.89 g CHO x kg BM(-1)) carbohydrate diet. Milk and blood samples were collected before an...

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...

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...

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...

The purpose of this study was to determine if breast milk composition changed significantly following exercise conducted at different intensities. Nine postpartum women exercised on a treadmill up to maximal oxygen uptake (100% of VO2max) on the first laboratory visit, for 30 minutes on two subsequent occasions (50% and 75% of VO2max) and also perf...

The results indicate that this system is an acceptable method to screen for hypercholesterolemia and the associated risk for coronary artery disease within this healthy population when using a single measurement. Although it was shown that this tabletop system significantly overestimated TC and TG values on a statistical basis, all of the obtained...

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...

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...

Hand-held dynamometry has proven reliable in assessing adult strength. The primary purpose of this study was to determine its reliability in children. Secondary purposes included investigating strength differences between males and females and between dominant (D) and nondominant (ND) sides. Subjects were 8-, 9-, and 10-year-old boys ( n =63) and g...

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...

The purpose of this investigation was to determine if lifestyle variables such as energy intake, fat intake, alcohol intake, aerobic activity, smoking, body mass index (BMI) and participation in college athletics predicted years of survival. A sample of white male alumni attending college prior to 1938, was surveyed about healthy lifestyles by mail...

This study examined the association between aerobic, caloric exercise expenditure and life status (living vs deceased) as well as the prevalence rates of hypertension (HBP) and cardiovascular disease (CVD) in former male athletes (ATH) and non-athletes (N-ATH). The initial survey for this study was done in 1952. Follow-up surveys of respondents wer...

This study examined the relationship between mortality and aerobic energy expenditure in an older population. A total of 348 subjects (Mean age = 69.0 +/- 7.1 years, range = 56.0-91.0 years) responded to a 1976 and 1984 questionnaire or responded to the 1976 questionnaire and were known to be deceased in 1984, Three aerobic energy expenditure group...

To study the relation between body build and the Type A behavior pattern, 194 college students were given the Jenkins Activity Survey as a measure of Type A behavior, Factor S (speed and impatience), and Factor H (hard driving and competitive) and the Heath-Carter somatotype method to measure body build. Subjects were grouped as endomorphs, mesomor...

Distance runners often complete a long duration run in their regular training program. This training run may cause muscle damage. Creatine Kinase (CK), an enzyme in the blood, is a marker of muscle damage. Delayed onset muscle soreness (DOMS) often accompanies elevations in CK. Together, these variable may negatively affect a runner's performance....