Physiology Commons^™

How Exercise Affects The Musculoskeletal System In The Biological Sexes: A Literature Review, Lauren Connolly

Honors Program Theses

Exercise has countless benefits for the human body. Physical activity increases overall health and reduces the risk of developing many chronic diseases. While the entire body is impacted by exercise, the musculoskeletal system is perhaps targeted most directly. Muscle contraction is required to complete any form of exercise, which helps build muscle mass and consequently strengthens bones. The physiology of musculoskeletal growth after exercise is the same for all individuals. However, the magnitude of this growth is not the same for men and women. Men have a profound ability to gain muscle mass that most women are not capable of …

Reply To “Programming May Matter Most.” Response To “Metabolic Effects Of Two High-Intensity Circuit Training Protocols: Does Sequence Matter?”, Tony P. Nuñez, Fabiano T. Amorim, Nicholas M. Beltz, Christine M. Mermier, Terence A. Moriarty, Roberto C. Nava, Trisha A. Vandusseldorp, Len Kravitz

Faculty Publications

We appreciate the interest that our study elicited and the comments from a reader. We commend the reader of our paper for critically evaluating the protocol and results of the study. Here, we would like to respond to the statement made in the letter. Indeed, the rest intervals were longer and time at VO2max was lower in our study than recommended by Bucheit and Larsen.1 However, because the reader is interested in the practical implications of our study, we ask that they consider the following:

Antiproliferative Effects Of Hibernating American Bullfrog (Rana Catesbeiana) Blood Plasma On Thp-1 Cells, Sean Robbins

Annual Graduate Student Symposium

Hibernation is an incredible adaptation that allows an organism to go dormant during the winter, when food is scarce. Much is unknown physiologically about hibernation, and most current research comes from mammalian models. During hibernation, the cells of mammals are impeded from going through mitosis. 13-lined ground squirrels (Ictidomys tridecemlineatus) and woodchucks (Marmota monax) have a protein, alpha-2-macroglobulin, in their blood plasma, which has significant antiproliferative effects on spleen cells. The goal of my study was to determine if an exothermic organism, the American Bullfrog (Rana catesbeiana), also actively suppresses mitosis while hibernating and if so, determine if it is …

Developmental Immunity Of The Skeletal Elements Of The Weberian Apparatus To The Effects Of Exogenous Estrogen (17-Β Estradiol), A Known Disruptor Of Cartliage Development, Bailey Jordan Wetherell

Honors Program Theses

Proper vertebrate development is controlled by a tightly regulated sequence of gene activation and repression. Exposure to both endogenous (hormones, gene products) and exogenous (environmental chemicals, toxins, etc.) substances during development can have profound effects on morphology by altering growth, cell fate, cell differentiation, and cell migration. Waterways have long been hot-spots for chemical and toxin accumulation, due to runoff and waste dumping. Growing concern is being paid to endocrine disruptors, like estrogen (17β-estradiol), which are found in increasing levels in rivers and streams. Endocrine disruptors are known to cause a varied number of defects in fish species, but the …

The Acute Effects Of Multiple Resisted Sled-Pull Loads On Subsequent Sprint-Running Performances, Carl Stephen Crouse

Dissertations and Theses @ UNI

Sled-pulling is a commonly implemented form of training for various sports. However, few studies have used sled-pulling as a means of acutely enhancing sprintrunning performances. The purpose of this study was to investigate how various sledpulling resistance loads (95% and 110% of body mass) effect subsequent, unloaded, sprint-running performances, possibly with aid from the effect known as Post-Activation Potentiation (PAP). PAP is a physiological phenomenon which increases the rate of force development of skeletal muscle which may result in the enhancement of power (speed-strength) dominant activities such as sprint-running and jumping.

Participants were a mix of males (n = 11; …

The Effects Of Hibernation On The Hemostatic Properties Of The American Bullfrog, Rana Catesbeiana, Kiana Cullinan

Honors Program Theses

It is known that hibernating animals display a drastic reduction in metabolic rate, accompanied by reduced heart rate and rate of blood flow through vessels. Sluggish blood flow increases the risk for developing clots, yet it has been observed that hibernators conclusively display elongated clotting times. This observed impairment may be caused by the decrease in body temperature, due to a negative impact on the functioning of the enzymes involved in coagulation. Some hibernating endotherms, or “warm-blooded” animals, employ biological mechanisms as preventative means to prevent clotting during hibernation, such as the down-regulation of certain clotting factors or the production …

Gender Differences In Social Support During Injury Rehabilitation, Chelsey Ann Bruns

Dissertations and Theses @ UNI

Athletic injury can be a stress-inducing event that could have negative consequences on the psychological health of the athlete (Anderson & Williams, 1988; Gould, Udry, Bridges, & Beck, 1997). Injuries not only challenge the athlete physically, but also mentally challenge their ability to cope and overcome. A growing amount of research has indicated social support as a key factor in the rehabilitation process for an injured athlete (Yang, Peek, Lowe, Heiden, & Foster, 2010). Athletic injury causes an emotional disruption, and social support could influence the athlete’s reaction to the injury and his or her ability to cope with rehabilitation …

The Effect Of Aging On Skeletal Muscle Regeneration, Ben E. Reinking

Presidential Scholars Theses (1990 – 2006)

Muscle atrophy and decreased strength are an accepted part of aging. While physical inactivity may account for some of these losses, physically active individuals still experience age related reduction in muscle mass and strength. The purpose of this study is to examine the effects that aging has on skeletal muscle regeneration. It is hypothesized that the recovery of muscle mass and force following muscular injury will decrease with age. The anesthetic bupivacaine, a potent myotoxic agent, was injected into the left tibialis anterior (TA) of young, adult, and senescent rats (3, 18, 31 months). The right leg served as an …

The Effect Of Supramaximal Exercise Intensity On The Maximal Accumulated Oxygen Deficit In Trained Female Athletes, Po-Ching Feng

Dissertations and Theses @ UNI

The purpose of this study was to determine the effect of supramaximal exercise intensity on the maximal accumulated oxygen deficit during uphill treadmill running. The accumulated oxygen deficit is the difference between the predicted oxygen demand and the actual oxygen utilization, and was determined during three different supramaximal exercises. A group of eight well-trained female athletes (age= 19.6 ± 1.1 year; body weight= 55.5 ± 5.0 kg; peak oxygen uptake= 56.26 ± 5.55 ml/kg/min) performed three exercises at intensities that corresponded to 110%, 125%, and 140% of peak oxygen uptake (V02peak). Pretesting included determining V02peak and four bouts of discontinuous …

The Effect Of Experimental Alterations In Excess Weight On Vertical Jump Performance, Bobbi Becker

Dissertations and Theses @ UNI

The purpose of this study was to investigate the effect of experimental alterations in relatively small amounts of excess weight on vertical jump height. The objective was to use the consequences of changes in body weight on vertical jump performance. The subjects were 19 Division I college volleyball players from the University of Northern Iowa. The mean value for age was 20.04 years, the mean height was 176.2 cm, the mean weight was 71.58 kg, and the mean percentage of body fat was 22.60% for all subjects. Each subject was tested under six weight conditions: (a) normal body weight, (b) …

The Effects Of Orally Ingested Sodium Bicarbonate On Performance Time And Blood Lactate Concentration In Trained Middle Distance Runners, Michael John Webster

Dissertations and Theses @ UNI

The purpose of this study was to examine the effect of orally ingested sodium bicarbonate on performance time and the accumulation of blood lactic acid in trained middle distance runners during short-term, high intensity treadmill running.

Nine, male, varsity track athletes, from the University of Northern Iowa performed two runs to exhaustion on a motor-driven treadmill at 15 mph. Sodium bicarbonate (NaHC03), or a placebo calcium carbonate (Caco3 ), amounting to .3 grams per kilogram of body weight was orally ingested 135 minutes prior to exercise. Venous blood was collected immediately before exercise, two minutes after exercise, and three minutes …